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| 1. general description the em773 is an arm cortex-m0 based, low-cost 32-bit energy metering ic, designed for 8/16-bit smart me tering applications. the em773 offers programmabilit y and on-chip metrology functionality combin ed with a low power, simple instruction set and memory addressing with reduced code size compared to existing 8/16-bit architectures. the em773 operates at cpu frequencies of up to 48 mhz. the peripheral complement of the em773 includes up to 32 kb of flash memory, up to 8 kb of data memory, one fast-mode plus i 2 c-bus interface, one rs-485/eia-485 uart, one spi interface with ssp feat ures, three general purpose counter/timers, up to 25 general purpose i/o pins, and a metrology engine for energy measurement. 2. features and benefits ? system: ? arm cortex-m0 processor, running at frequencies of up to 48 mhz. ? arm cortex-m0 built-in nested vect ored interrupt controller (nvic). ? serial wire debug. ? system tick timer. ? memory: ? 32 kb on-chip flash programming memory. ? 8 kb sram. ? in-system programming (isp) and in-application programming (iap) via on-chip bootloader software. ? digital peripherals: ? up to 25 general purpose i/o (gpio) pi ns with configurable pull-up/pull-down resistors. ? gpio pins can be used as edge and level sensitive interrupt sources. ? high-current output driver (20 ma) on one pin. ? high-current sink drivers (20 ma) on two i 2 c-bus pins in fast-mode plus. ? three general purpose counter/timers with a total of two capture inputs and 10 match outputs. ? programmable watchdog timer (wdt). ? analog peripherals: ? metrology engine for smart metering with two current inputs and a voltage input. em773 energy metering ic; up to 32 kb flash and 8 kb sram rev. 1 ? 1 september 2010 objective data sheet
em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 2 of 45 nxp semiconductors em773 energy metering ic ? serial interfaces: ? uart with fractional baud rate generation, internal fifo, and rs-485 support. ? one spi controller with ssp f eatures and with fi fo and multi-prot ocol capabilities. ? i 2 c-bus interface supporting full i 2 c-bus specification and fast-mode plus with a data rate of 1 mbit/s with multiple address reco gnition and monitor mode. ? clock generation: ? 12 mhz internal rc oscillator trimmed to 1 % accuracy that can optionally be used as a system clock. ? crystal oscillator with an operat ing range of 1 mhz to 25 mhz. ? programmable watchdog oscillator with a frequency range of 7.8 khz to 1.8 mhz. ? pll allows cpu operation up to the maximum cpu rate without the need for a high-frequency crystal. may be run from th e system oscillator or the internal rc oscillator. ? clock output function with divider that ca n reflect the system oscillator clock, irc clock, cpu clock, and the watchdog clock. ? power control: ? integrated pmu (power management unit) to minimize power consumption during sleep, deep-sleep, and deep power-down modes. ? three reduced power modes: sleep, deep-sleep, and deep power-down. ? processor wake-up from deep-sleep mode via a dedicated start logic using up to 13 of the functional pins. ? power-on reset (por). ? brownout detect with four separate thre sholds for interrup t and forced reset. ? unique device serial number for identification. ? single 3.3 v power supply (1.8 v to 3.6 v). ? available as 33-pin hvqfn package. 3. applications ? smart metering 4. ordering information table 1. ordering information type number package name description version EM773FHN33/301 hvqfn33 hvqfn: plastic t hermal enhanced very thin quad flat package; no leads; 33 terminals; body 7 7 0.85 mm n/a em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 3 of 45 nxp semiconductors em773 energy metering ic 5. block diagram fig 1. em773 block diagram sram 8 kb arm cortex-m0 test/debug interface flash 32 kb high-speed gpio ahb to apb bridge clock generation, power control, system functions xtalin xtalout reset clocks and controls swd em773 em773_002aae696 slave slave slave slave rom slave ahb-lite bus gpio ports pio0/1/2/3 clkout irc por spi0 metrology engine uart 32-bit counter/timer 0 i 2 c-bus wdt ioconfig ct32b0_mat[2:0] i_lowgain i_highgain voltage ct32b0_cap0 sda scl rxd txd dtr, cts, rts system control pmu 32-bit counter/timer 1 ct32b1_mat[3:0] 16-bit counter/timer 0 ct16b0_mat[2:0] ct16b0_cap0 sck0, ssel0 miso0, mosi0 system bus em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 4 of 45 nxp semiconductors em773 energy metering ic 6. pinning information 6.1 pinning fig 2. pin configuration hvqfn 33 package em773_002aae698 transparent top view pio0_8/miso0/ct16b0_mat0 pio1_8 pio0_2/ssel0/ct16b0_cap0 pio0_9/mosi0/ct16b0_mat1 v dd swclk/pio0_10/sck0/ct16b0_mat2 xtalout i_lowgain xtalin i_highgain pio0_1/clkout/ct32b0_mat2 voltage reset/pio0_0 r/pio1_1/ct32b1_mat0 pio2_0/dtr r/pio1_2/ct32b1_mat1 pio0_3 pio0_4/scl pio0_5/sda pio1_9 pio3_4 pio3_5 pio0_6/sck0 pio0_7/cts pio1_7/txd/ct32b0_mat1 pio1_6/rxd/ct32b0_mat0 pio1_5/rts/ct32b0_cap0 v dd pio3_2 pio1_11 pio1_4/ct32b1_mat3/wakeup swdio/pio1_3/ct32b1_mat2 8 17 7 18 6 19 5 20 4 21 3 22 2 23 1 24 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 terminal 1 index area 33 v ss em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 5 of 45 nxp semiconductors em773 energy metering ic 6.2 pin description table 2. em773 pin description table (hvqfn33 package) symbol pin start logic input type reset state [1] description pio0_0 to pio0_10 i/o port 0 ? port 0 is a 12-bit i/o port with individual direction and function controls for each bit. the operation of port 0 pins depends on the function selected through the ioconf ig register block. pin pio0_11 is not available. reset /pio0_0 2 [2] yes i i;pu reset ? external reset inpu t: a low on this pin resets the device, causing i/o ports and peripherals to take on their default states, and processor execution to begin at address 0. i/o - pio0_0 ? general purpose digital input/output pin. pio0_1/clkout/ ct32b0_mat2 3 [3] yes i/o i;pu pio0_1 ? general purpose digital input/output pin. a low level on this pin during reset starts the isp command handler. o- clkout ? clock out pin. o- ct32b0_mat2 ? match output 2 for 32-bit timer 0. pio0_2/ssel0/ ct16b0_cap0 8 [3] yes i/o i;pu pio0_2 ? general purpose digital input/output pin. i/o - ssel0 ? slave select for spi0. i- ct16b0_cap0 ? capture input 0 for 16-bit timer 0. pio0_3 9 [3] yes i/o i;pu pio0_3 ? general purpose digital input/output pin. pio0_4/scl 10 [4] yes i/o ia pio0_4 ? general purpose digital input/output pin (open-drain). i/o - scl ? i 2 c-bus, open-drain clock input/output. high-current sink only if i 2 c fast-mode plus is selected in the i/o configuration register. pio0_5/sda 11 [4] yes i/o ia pio0_5 ? general purpose digital input/output pin (open-drain). i/o - sda ? i 2 c-bus, open-drain data input/output. high-current sink only if i 2 c fast-mode plus is selected in the i/o configuration register. pio0_6/sck0 15 [3] yes i/o i;pu pio0_6 ? general purpose digital input/output pin. i/o - sck0 ? serial clock for spi0. pio0_7/cts 16 [3] yes i/o i;pu pio0_7 ? general purpose digital input/output pin (high-current output driver). i- cts ? clear to send input for uart. pio0_8/miso0/ ct16b0_mat0 17 [3] yes i/o i;pu pio0_8 ? general purpose digital input/output pin. i/o - miso0 ? master in slave out for spi0. o- ct16b0_mat0 ? match output 0 for 16-bit timer 0. pio0_9/mosi0/ ct16b0_mat1 18 [3] yes i/o i;pu pio0_9 ? general purpose digital input/output pin. i/o - mosi0 ? master out slave in for spi0. o- ct16b0_mat1 ? match output 1 for 16-bit timer 0. em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 6 of 45 nxp semiconductors em773 energy metering ic swclk/pio0_10/sck0/ ct16b0_mat2 19 [3] yes i i;pu swclk ? serial wire clock. i/o - pio0_10 ? general purpose digital input/output pin. i/o - sck0 ? serial clock for spi0. o- ct16b0_mat2 ? match output 2 for 16-bit timer 0. i_highgain 21 [5] no i i;pu i_highgain ? high gain current input for metrology engine. pio1_1 to pio1_9; pio1_11 i/o port 1 ? port 1 is a 12-bit i/o port with individual direction and function controls for each bit. the operation of port 1 pins depends on the function selected through the ioconfig register block. pins pio1_0 and pio1_10 are not available. voltage 22 [5] no i i;pu voltage ? voltage input for the metrology engine. r/pio1_1/ ct32b1_mat0 23 [5] no o i;pu r ? reserved. configure for an alternate function in the ioconfig block. i/o - pio1_1 ? general purpose digital input/output pin. o- ct32b1_mat0 ? match output 0 for 32-bit timer 1. r/pio1_2/ ct32b1_mat1 24 [5] no i i;pu r ? reserved. configure for an alternate function in the ioconfig block. i/o - pio1_2 ? general purpose digital input/output pin. o- ct32b1_mat1 ? match output 1 for 32-bit timer 1. swdio/pio1_3/ ct32b1_mat2 25 [5] no i/o i;pu swdio ? serial wire debug input/output. i/o - pio1_3 ? general purpose digital input/output pin. o- ct32b1_mat2 ? match output 2 for 32-bit timer 1. pio1_4/ ct32b1_mat3/wakeup 26 no i/o i;pu pio1_4 ? general purpose digital input/output pin. o- ct32b1_mat3 ? match output 3 for 32-bit timer 1. i- wakeup ? deep power-down mode wake-up pin. this pin must be pulled high externally to enter deep power-down mode and pulled low to exit deep power-down mode. pio1_5/rts / ct32b0_cap0 30 [3] no i/o i;pu pio1_5 ? general purpose digital input/output pin. o- rts ? request to send output for uart. i- ct32b0_cap0 ? capture input 0 for 32-bit timer 0. pio1_6/rxd/ ct32b0_mat0 31 [3] no i/o i;pu pio1_6 ? general purpose digital input/output pin. i- rxd ? receiver input for uart. o- ct32b0_mat0 ? match output 0 for 32-bit timer 0. pio1_7/txd/ ct32b0_mat1 32 [3] no i/o i;pu pio1_7 ? general purpose digital input/output pin. o- txd ? transmitter output for uart. o- ct32b0_mat1 ? match output 1 for 32-bit timer 0. pio1_8 7 [3] no i/o i;pu pio1_8 ? general purpose digital input/output pin. pio1_9 12 [3] no i/o i;pu pio1_9 ? general purpose digital input/output pin. i_lowgain 20 no i i;pu i_lowgain ? low gain current in put for metrology engine. table 2. em773 pin description table (hvqfn33 package) ?continued symbol pin start logic input type reset state [1] description em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 7 of 45 nxp semiconductors em773 energy metering ic [1] pin state at reset for default function: i = input; o = ou tput; pu = internal pull-up enabled; ia = inactive, no pull-up/dow n enabled. [2] see figure 24 for the reset pad configuration. reset functionality is not available in deep power-down mode. use the wakeup pin to reset the chip and wake up from deep power-down mode. [3] 5 v tolerant pad providing digital i/o functions with conf igurable pull-up/pull-down resistor s and configurable hysteresis ( see figure 23 ). [4] i 2 c-bus pads compliant with the i 2 c-bus specification for i 2 c standard mode and i 2 c fast-mode plus. [5] 5 v tolerant pad providing digital i/o functions with conf igurable pull-up/pull-down resistor s, configurable hysteresis, and analog input. [6] when the system oscillator is not used, connect xtalin and xtalout as follows: xtalin can be left floating or can be grounde d (grounding is preferred to reduce susceptibilit y to noise). xtalout should be left floating. pio1_11 27 no i/o i;pu pio1_11 ? general purpose digital input/output pin. pio2_0 i/o port 2 ? port 2 is a 12-bit i/o port with individual direction and function controls for each bit. the operation of port 2 pins depends on the function selected through the ioconfig register block. pins pio2_1 to pio2_11 are not available. pio2_0/dtr 1 [3] no i/o i;pu pio2_0 ? general purpose digital input/output pin. o- dtr ? data terminal ready output for uart. pio3_0 to pio3_5 no i/o port 3 ? port 3 is a 12-bit i/o port with individual direction and function controls for each bit. the operation of port 3 pins depends on the function selected through the ioconfig register block. pins pio3_0, pio3_1, pio3_3 and pio3_6 to pio3_11 are not available. pio3_2 28 [3] no i/o i;pu pio3_2 ? general purpose digital input/output pin. pio3_4 13 [3] no i/o i;pu pio3_4 ? general purpose digital input/output pin. pio3_5 14 [3] no i/o i;pu pio3_5 ? general purpose digital input/output pin. v dd 6; 29 - i - 3.3 v supply voltage to the internal regulator, the external rail, and the metrology engine. xtalin 4 [6] - i - input to the oscillator circuit and internal clock generator circuits. input voltage must not exceed 1.8 v. xtalout 5 [6] - o - output from the oscillator amplifier. v ss 33 - - - thermal pad. connect to ground. table 2. em773 pin description table (hvqfn33 package) ?continued symbol pin start logic input type reset state [1] description em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 8 of 45 nxp semiconductors em773 energy metering ic 7. functional description 7.1 arm cortex-m0 processor the arm cortex-m0 is a general purpose, 32-bit microprocessor, which offers high performance and very low power consumption. 7.2 on-chip flash program memory the em773 contains 32 kb of on-chip flash memory. 7.3 on-chip sram the em773 contains a total of 8 kb on-chip static ram memory. 7.4 memory map the em773 incorporates several distinct memo ry regions, shown in the following figures. figure 3 shows the overall map of the entire address space from the user program viewpoint following reset. the interrupt vector area supports address remapping. the ahb peripheral area is 2 megabyte in si ze, and is divided to allow for up to 128 peripherals. the apb peripheral ar ea is 512 kb in size and is divided to allow for up to 32 peripherals. each peripheral of either type is allocated 16 kilobytes of space. this allows simplifying the address decoding for each peripheral. em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 9 of 45 nxp semiconductors em773 energy metering ic 7.5 nested vectored inte rrupt controller (nvic) the nested vectored in terrupt controller (nvic) is an integral part of the cortex-m0. the tight coupling to the cpu allows for low interr upt latency and efficient processing of late arriving interrupts. 7.5.1 features ? controls system exceptions and peripheral interrupts. ? in the em773, the nvic supports 32 vectored interrupts including up to 13 inputs to the start logic from individual gpio pins. fig 3. em773 memory map 0x5000 0000 0x5001 0000 0x5002 0000 0x5020 0000 ahb peripherals 16-127 reserved gpio pio1 4-7 0x5003 0000 0x5004 0000 gpio pio2 gpio pio3 8-11 12-15 gpio pio0 0-3 apb peripherals 0x4000 4000 0x4000 8000 0x4000 c000 0x4001 0000 0x4001 8000 0x4003 8000 0x4003 c000 0x4004 0000 0x4004 4000 0x4004 8000 0x4004 c000 0x4008 0000 0x4001 c000 0x4001 4000 0x4000 0000 wdt 32-bit counter/timer 0 32-bit counter/timer 1 uart pmu i 2 c-bus 13 - 7 reserved 31 - 19 reserved 0 1 2 3 4 5 6 16 15 14 17 18 reserved reserved reserved 0x0000 0000 0 gb 0.5 gb 4 gb 1 gb 0x1000 2000 0x1fff 0000 0x1fff 4000 0x2000 0000 0x4000 0000 0x4008 0000 0x5000 0000 0x5020 0000 0xffff ffff reserved reserved reserved apb peripherals ahb peripherals 8 kb sram 0x1000 0000 em773 0x0000 8000 32 kb on-chip flash 16 kb boot rom 0x0000 0000 0x0000 00c0 active interrupt vectors em773_002aae699 spi0 reserved 16-bit counter/timer 0 ioconfig system control flash controller em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 10 of 45 nxp semiconductors em773 energy metering ic ? four programmable interrupt priority leve ls, with hardware pr iority level masking. ? software interr upt generation. 7.5.2 interrupt sources each peripheral device has one interrupt line connected to the nvic but may have several interrupt flags. individual interrupt flags may also represent more than one interrupt source. any gpio pin (total of up to 25 pins) regardless of the selected function, can be programmed to generate an interrupt on a level, or rising edge or falling edge, or both. 7.6 ioconfig block the ioconfig block allows sele cted pins of the microcontroller to have more than one function. configuration registers control the multiplexers to allow connection between the pin and the on-chip peripherals. peripherals should be connected to the appropriate pins prior to being activated and prior to any related interrupt(s) being enabled. activi ty of any enabled peripheral function that is not mapped to a related pin should be considered undefined. 7.7 fast general purpose parallel i/o device pins that are not connec ted to a specific peripheral function are controlled by the gpio registers. pins may be dynamically configured as inputs or outputs. multiple outputs can be set or cleared in one write operation. em773 uses accelerated gpio functions: ? gpio registers are a dedicated ahb peripheral so that the fastest possible i/o timing can be achieved. ? entire port value can be written in one instruction. additionally, any gpio pin (total of up to 25 pins) providing a digital function can be programmed to generate an interrupt on a level, a rising or falling edge, or both. 7.7.1 features ? bit level port registers allow a single instruct ion to set or clear any number of bits in one write operation. ? direction control of individual bits. ? all i/o default to inputs with pull-ups enabled after reset. ? pull-up/pull-down resistor configuration can be programmed through the ioconfig block for each gpio pin. 7.8 uart the em773 contains one uart. support for rs-485/9-bit mode allows both software address detection and automatic address detection using 9-bit mode. em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 11 of 45 nxp semiconductors em773 energy metering ic the uart includes a fractional baud rate generator. standard baud rates such as 115200 bd can be achieved with any crystal frequency above 2 mhz. 7.8.1 features ? maximum uart data bit rate of 3.125 mbit/s. ? 16 byte receive and transmit fifos. ? register locations conform to 16c550 industry standard. ? receiver fifo trigger points at 1 b, 4 b, 8 b, and 14 b. ? built-in fractional baud rate generator cove ring wide range of baud rates without a need for external crystals of particular values. ? fifo control mechanism that enables software flow control implementation. ? support for rs-485/9-bit mode. ? support for modem control. 7.9 spi serial i/o controller the em773 contains one spi controller. the spi controller is capable of operation on a ssp, 4-wire ssi, or microwire bus. it can interact with multiple masters and slaves on the bus. only a single master and a single slave can communicate on the bus during a given data transfer. the spi supports full duplex transfers, with frames of 4 bits to 16 bits of data flowing from the master to the slave and from the slave to the master. in practice, often only one of these data flows carries meaningful data. 7.9.1 features ? maximum spi speed of 25 mbit/s (master) or 4.17 mbit/s (slave) (in ssp mode) ? compatible with motorola spi, 4-wire texas instruments ssi, and national semiconductor microwire buses ? synchronous serial communication ? master or slave operation ? 8-frame fifos for both transmit and receive ? 4-bit to 16-bit frame 7.10 i 2 c-bus serial i/o controller the em773 contains one i 2 c-bus controller. the i 2 c-bus is bidirectional for inter-ic control using only two wires: a serial clock line (scl) and a serial data line (sda). each de vice is recognized by a unique address and can operate as either a receiver-only device (e.g., an lcd driver) or a transmitter with the capability to both receive and send information (such as me mory). transmitters and/or receivers can operate in either master or sl ave mode, depending on whether the chip has to initiate a data transfer or is only addressed. the i 2 c is a multi-master bus and can be controlled by more than one bus master connected to it. em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 12 of 45 nxp semiconductors em773 energy metering ic 7.10.1 features ? the i 2 c-interface is a standard i 2 c-bus compliant interface with open-drain pins. the i 2 c-bus interface also supports fast-mod e plus with bit rates up to 1 mbit/s. ? easy to configure as master, slave, or master/slave. ? programmable clocks allow versatile rate control. ? bidirectional data transfer between masters and slaves. ? multi-master bus (no central master). ? arbitration between simultaneously transmit ting masters without corruption of serial data on the bus. ? serial clock synchronization allows devices with different bit rates to communicate via one serial bus. ? serial clock synchronization can be used as a handshake mechanism to suspend and resume serial transfer. ? the i 2 c-bus can be used for test and diagnostic purposes. ? the i 2 c-bus controller supports multiple address recognition and a bus monitor mode. 7.11 metrology engine the em773 contains a metrology engine designed to collect voltage and current inputs to calculate the active power, reactive power, apparent power and power factor of a load. the purpose of the metrology en gine is for non-billing applicat ions such as plug meters, smart appliances, industrial and consumer sub-meters, etc. 7.11.1 features ? 1 % accurate for scalable input sources up to 230 v/50 hz/16 a and 110 v/60 hz/20 a while maintaining this accuracy with a factor of 1 to 400 down from this maximum current. ? automatically calculates active power in w, reactive power in var, apparent power in va, power factor ratio, vrms and irms without arm cpu intervention. ? standard api for initializing, starting, stopping and reading data from the metrology engine using the arm cortex m0. 7.12 general purpose externa l event counter/timers the em773 includes two 32-bit counter/timers and one 16-bit counter/timers. the counter/timer is designed to count cycles of the system derived clock. it can optionally generate interrupts or perform other actions at specified timer values, based on four match registers. each counter/timer also incl udes one capture input to trap the timer value when an input signal transitions, optionally generating an interrupt. 7.12.1 features ? a 32-bit/16-bit timer/counter with a programmable 32-bit/16-bit prescaler. ? counter or timer operation. ? one capture channel per timer, that can ta ke a snapshot of the timer value when an input signal transitions. a capture event may also generate an interrupt. em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 13 of 45 nxp semiconductors em773 energy metering ic ? four match registers per timer that allow: ? continuous operation with optional interrupt generation on match. ? stop timer on match with optional interrupt generation. ? reset timer on match with optional interrupt generation. ? up to four external outputs corresponding to match registers, with the following capabilities: ? set low on match. ? set high on match. ? toggle on match. ? do nothing on match. 7.13 system tick timer the arm cortex-m0 includes a system tick timer (systic k) that is inte nded to generate a dedicated systick exception at a fi xed time interval (typically 10 ms). 7.14 watchdog timer the purpose of the watchdog is to reset t he microcontroller within a selectable time period. 7.14.1 features ? internally resets chip if not period ically reloaded. ? debug mode. ? enabled by software but requires a hardware reset or a watchdog reset/interrupt to be disabled. ? incorrect/incomplete feed sequence causes reset/interrupt if enabled. ? flag to indicate watchdog reset. ? programmable 24-bit timer with internal prescaler. ? selectable time period from (t cy(wdclk) 256 4) to (t cy(wdclk) 2 24 4) in multiples of t cy(wdclk) 4. ? the watchdog clock (wdclk) source can be selected from the in ternal rc oscillator (irc), the watchdog oscillator, or the main cl ock. this gives a wid e range of potential timing choices of watchdog operation unde r different power reduction conditions. it also provides the ability to run the wdt from an entirely internal source that is not dependent on an external crystal and its associated components and wiring for increased reliability. 7.15 clocking and power control 7.15.1 crystal oscillators the em773 includes three inde pendent oscillators. these are the system oscillator, the internal rc oscillator (irc), and the watchdog oscillator. ea ch oscillator can be used for more than one purpose as required in a particular application. em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 14 of 45 nxp semiconductors em773 energy metering ic following reset, the em773 will op erate from the internal rc oscillator until switched by software. this allows systems to operate without any external crystal and the bootloader code to operate at a known frequency. see figure 4 for an overview of the em773 clock generation. 7.15.1.1 internal rc oscillator the irc may be used as the clock source for th e wdt, and/or as the clock that drives the pll and subsequently the cpu. the nominal irc frequency is 12 mhz. the irc is trimmed to 1 % accuracy over the entire voltage and temperature range. upon power-up or any chip reset, the em773 uses the irc as the clock source. software may later switch to one of the other available clock sources. 7.15.1.2 system oscillator the system oscillator can be used as the clock source for the cpu, with or without using the pll. the system oscillator operates at frequencies of 1 mhz to 25 mhz. this frequency can be boosted to a higher frequency, up to the maximum cpu operating frequency, by the system pll. fig 4. em773 clock generation block diagram system pll irc oscillator system oscillator watchdog oscillator irc oscillator watchdog oscillator mainclksel (main clock select) syspllclksel (system pll clock select) system clock divider ahb clock 0 (system) ahbclkctrl[1:18] (ahb clock enable) ahb clocks 1 to 18 (memories and peripherals) spi0 peripheral clock divider spi0 uart peripheral clock divider uart wdt clock divider wdt wdtuen (wdt clock update enable) watchdog oscillator irc oscillator system oscillator clkout pin clock divider clkout pin clkoutuen (clkout update enable) em773_002aae514 main clock system clock irc oscillator 18 em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 15 of 45 nxp semiconductors em773 energy metering ic 7.15.1.3 watchdog oscillator the watchdog oscillator can be used as a clock source that directly drives the cpu, the watchdog timer, or the clkout pin. the watchdog oscillator nominal frequency is programmable between 7.8 khz and 1.7 mhz. th e frequency spread over processing and temperature is 40 %. 7.15.2 system pll the pll accepts an input clock frequency in the range of 10 mhz to 25 mhz. the input frequency is multiplied up to a high frequency with a curren t controlled oscillator (cco). the multiplier can be an integer value from 1 to 32. the cco operates in the range of 156 mhz to 320 mhz, so there is an additional divider in the loop to keep the cco within its frequency range while the pll is provid ing the desired output frequency. the output divider may be set to divide by 2, 4, 8, or 16 to produce the output clock. since the minimum output divider value is 2, it is insu red that the pll output has a 50 % duty cycle. the pll is turned off and bypassed following a chip reset and may be enabled by software. the program must configure and activate the pll, wait for the pll to lock, and then connect to the pll as a clock source. the pll settling time is 100 s. 7.15.3 clock output the em773 featur es a clock output functi on that routes the irc oscillator, the system oscillator, the watchdog oscillator, or the main clock to an output pin. 7.15.4 wake-up process the em773 begins operation at power-up and when awakened from deep power-down mode by using the 12 mhz irc os cillator as the cloc k source. this allo ws chip operation to resume quickly. if the system oscillato r or the pll is needed by the application, software will need to enable th ese features and wait for them to stabilize before they are used as a clock source. 7.15.5 power control the em773 supports a variety of power contro l features. there are three special modes of processor power reduction: sleep mode, deep-sleep mode, and deep power-down mode. the cpu clock rate may also be controlled as needed by changing clock sources, reconfiguring pll values, and/or altering the cpu clock divider value. this allows a trade-off of power versus processing speed based on application requirements. in addition, a register is provided for shutti ng down the clocks to individual on-chip peripherals, allowing fine tuning of power consumption by eliminating all dynamic power use in any peripherals that are not required fo r the application. selected peripherals have their own clock divider which prov ides even better power control. 7.15.5.1 sleep mode when sleep mode is entered, the clock to the core is stopped. resumption from the sleep mode does not need any special sequence but re-enabling the clock to the arm core. in sleep mode, execution of instructions is suspended until either a reset or interrupt occurs. peripheral functions continue opera tion during sleep mode and may generate interrupts to cause the processor to resume execution. sleep mode eliminates dynamic power used by the processor itself, memory systems and related controllers, and internal buses. em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 16 of 45 nxp semiconductors em773 energy metering ic 7.15.5.2 deep-sleep mode in deep-sleep mode, the chip is in sleep mo de, and in addition all analog blocks are shut down. as an exception, the user has the opt ion to keep the watchdog oscillator and the bod circuit running for self-timed wake-up and bod protection. deep-sleep mode allows for additional power savings. up to 13 pins total serve as external wake-up pins to the start logic to wake up the chip from deep-sleep mode. unless the watchdog oscillator is selected to run in deep-s leep mode, the clock source should be switched to irc before entering deep-sleep mode, because the irc can be switched on and off glitch-free. 7.15.5.3 deep power-down mode in deep power-down mode, power is shut off to the entire chip with the exception of the wakeup pin. the em773 can wa ke up from deep power- down mode via the wakeup pin. 7.16 system control 7.16.1 start logic the start logic connects external pins to corresponding interrupts in the nvic. each pin shown in ta b l e 2 as input to the start logic has an individual interrupt in the nvic interrupt vector table. the start logic pins can serve as external interrupt pins when the chip is running. in addition, an input signal on the start logic pins can wake up the chip from deep-sleep mode when all clocks are shut down. the start logic must be configured in the system configuration block and in the nvic before being used. 7.16.2 reset reset has four sources on the em773: the reset pin, the watchdog reset, power-on reset (por), and the brownout detection (bod) circuit. the reset pin is a schmitt trigger input pin. assertion of chip reset by any source, once the operating voltage attains a usable level, starts the irc an d initializes the flash controller. when the internal reset is removed, the proc essor begins executing at address 0, which is initially the reset vector mapped from the bo ot block. at that point, all of the processor and peripheral registers have been in itialized to predetermined values. 7.16.3 brownout detection the em773 includes four levels for monitoring the voltage on the v dd pin. if this voltage falls below one of the four selected levels, the bod asserts an interrupt signal to the nvic. this signal can be enabled for interrupt in the interrupt enable register in the nvic in order to cause a cpu interrupt; if not, software can monitor the signal by reading a dedicated status register. four additional threshold levels can be selected to cause a forced reset of the chip. em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 17 of 45 nxp semiconductors em773 energy metering ic 7.16.4 code security (code read protection - crp) this feature of the em773 allows user to enable different levels of security in the system so that access to the on-chip flash and use of the serial wire debugger (swd) and in-system programming (isp) can be restricted. when needed, crp is invoked by programming a specific pattern into a ded icated flash location. iap commands are not affected by the crp. in addition, isp entry via the pio0_1 pin can be disabled without enabling crp. for details see the em773 user manual . there are three levels of code read protection: 1. crp1 disables access to the chip via the swd and allows partial flash update (excluding flash sector 0) using a limited set of the isp commands. this mode is useful when crp is required and flash fi eld updates are needed but all sectors can not be erased. 2. crp2 disables access to the chip via the swd and only allows full flash erase and update using a reduced set of the isp commands. 3. running an application with level crp3 select ed fully disables any access to the chip via the swd pins and the isp. this mode effectively disables isp override using pio0_1 pin, too. it is up to the user?s application to provide (if needed) flash update mechanism using iap calls or call reinvoke isp command to enable flash update via the uart. in addition to the three crp levels, sampli ng of pin pio0_1 for valid user code can be disabled. for details see the em773 user manual . 7.16.5 apb interface the apb peripherals are located on one apb bus. 7.16.6 ahblite the ahblite connects the cpu bus of the arm cortex-m0 to the flash memory, the main static ram, and the boot rom. 7.16.7 external interrupt inputs all gpio pins can be level or edge sensitive interrupt inputs. 7.17 emulation and debugging debug functions are integrated into the arm cortex-m0. serial wire debug with four breakpoints and two watchpoints is supported. caution if level three code read protection (crp3) is selected, no future factory testing can be performed on the device. em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 18 of 45 nxp semiconductors em773 energy metering ic 8. limiting values [1] the following applies to the limiting values: a) this product includes circuitry specif ically designed for the protection of its in ternal devices from the damaging effects of excessive static charge. nonetheless, it is sugges ted that conventional precautions be tak en to avoid applying greater than the rated maximum. b) parameters are valid over operating te mperature range unless otherwise specifi ed. all voltages are with respect to v ss unless otherwise noted. [2] including voltage on outputs in 3-state mode. [3] the peak current is limited to 25 times the corresponding maximum current. [4] dependent on package type. [5] human body model: equivalent to dischar ging a 100 pf capacitor through a 1.5 k series resistor. table 3. limiting values in accordance with the absolute ma ximum rating system (iec 60134). [1] symbol parameter conditions min max unit v dd supply voltage (core and external rail) 1.8 3.6 v v i input voltage 5 v tolerant i/o pins; only valid when the v dd supply voltage is present [2] ? 0.5 +5.5 v i dd supply current per supply pin [3] - 100 ma i ss ground current per ground pin [3] - 100 ma i latch i/o latch-up current ? (0.5v dd ) < v i < (1.5v dd ); t j < 125 c - 100 ma t stg storage temperature [4] ? 65 +150 c t j(max) maximum junction temperature - 150 c p tot(pack) total power dissipation (per package) based on package heat transfer, not device power consumption -1.5w v esd electrostatic discharge voltage human body model; all pins [5] ? 6500 +6500 v em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 19 of 45 nxp semiconductors em773 energy metering ic 9. static characteristics table 4. static characteristics t amb = ? 40 c to +85 c, unless otherwise specified. symbol parameter conditions min typ [1] max unit v dd supply voltage (core and external rail) 1.8 3.3 3.6 v i dd supply current active mode; code while(1){} executed from flash system clock = 12 mhz v dd = 3.3 v [2] [3] [4] [5] [6] -3-ma system clock = 50 mhz v dd = 3.3 v [2] [3] [5] [6] [7] -9-ma sleep mode; system clock = 12 mhz v dd = 3.3 v [2] [3] [4] [5] [6] -2-ma deep-sleep mode; v dd = 3.3 v [2] [3] [8] -6- a deep power-down mode; v dd = 3.3 v [2] [9] -220-na standard port pins, reset i il low-level input current v i = 0 v; on-chip pull-up resistor disabled - 0.5 10 na i ih high-level input current v i =v dd ; on-chip pull-down resistor disabled - 0.5 10 na i oz off-state output current v o =0v; v o =v dd ; on-chip pull-up/down resistors disabled - 0.5 10 na v i input voltage pin configured to provide a digital function [10] [11] [12] 0- 5.0v v o output voltage output active 0 - v dd v v ih high-level input voltage 0.7v dd --v v il low-level input voltage - - 0.3v dd v v hys hysteresis voltage - 0.4 - v v oh high-level output voltage 2.0 v v dd 3.6 v; i oh = ? 4 ma v dd ? 0.4--v 1.8 v v dd < 2.0 v; i oh = ? 3 ma v dd ? 0.4--v v ol low-level output voltage 2.0 v v dd 3.6 v; i ol =4 ma --0.4v 1.8 v v dd < 2.0 v; i ol =3 ma --0.4v em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 20 of 45 nxp semiconductors em773 energy metering ic i oh high-level output current v oh =v dd ? 0.4 v; 2.0 v v dd 3.6 v ? 4--ma 1.8 v v dd < 2.0 v ? 3--ma i ol low-level output current v ol =0.4v 2.0 v v dd 3.6 v 4--ma 1.8 v v dd < 2.0 v 3--ma i ohs high-level short-circuit output current v oh =0v [13] -- ? 45 ma i ols low-level short-circuit output current v ol =v dd [13] --50ma i pd pull-down current v i =5v 10 50 150 a i pu pull-up current v i =0v; 2.0 v v dd 3.6 v ? 15 ? 50 ? 85 a 1.8 v v dd < 2.0 v ? 10 ? 50 ? 85 a v dd em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 23 of 45 nxp semiconductors em773 energy metering ic 9.1 bod static characteristics [1] interrupt levels are selected by writing the le vel value to the bod control register bodctrl, see em773 user manual . 9.2 power consumption power measurements in active, sleep, and deep-sleep modes were performed under the following conditions (see em773 user manual ): ? configure all pins as gpio with pull-up resistor disabled in the ioconfig block. ? configure gpio pins as outputs using the gpiondir registers. ? write 0 to all gpiondata registers to drive the outputs low. table 5. bod static characteristics [1] t amb =25 c. symbol parameter conditions min typ max unit v th threshold voltage interrupt level 0 assertion - 1.65 - v de-assertion - 1.80 - v interrupt level 1 assertion - 2.22 - v de-assertion - 2.35 - v interrupt level 2 assertion - 2.52 - v de-assertion - 2.66 - v interrupt level 3 assertion - 2.80 - v de-assertion - 2.90 - v reset level 0 assertion - 1.46 - v de-assertion - 1.63 - v reset level 1 assertion - 2.06 - v de-assertion - 2.15 - v reset level 2 assertion - 2.35 - v de-assertion - 2.43 - v reset level 3 assertion - 2.63 - v de-assertion - 2.71 - v em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 24 of 45 nxp semiconductors em773 energy metering ic conditions: t amb = 25 c; active mode entered executing code while(1){} from flash; all peripherals disabled in the ahbclkctrl register (ahbclkctrl = 0x1f); all peripheral clocks disabled; internal pull-up resi stors disabled; bod disabled. (1) system oscillator and syste m pll disabled; irc enabled. (2) system oscillator and syste m pll enabled; irc disabled. fig 5. active mode: typical supply current i dd versus supply voltage v dd for different system clock frequencies conditions: v dd = 3.3 v; active mode entered executing code while(1){} from flash; all peripherals disabled in the ahbclkctrl register (ahbclkctrl = 0x1f); all peripheral clocks disabled; internal pull-up resi stors disabled; bod disabled. (1) system oscillator and syste m pll disabled; irc enabled. (2) system oscillator and syste m pll enabled; irc disabled. fig 6. active mode: typical supply current i dd versus temperature for different system clock frequencies v dd (v) 1.8 3.6 3.0 2.4 002aaf390 4 8 12 i dd (ma) 0 12 mhz (1) 24 mhz (2) 36 mhz (2) 48 mhz (2) temperature ( c) ? 40 85 35 10 60 ? 15 002aaf391 4 8 12 i dd (ma) 0 12 mhz (1) 24 mhz (2) 36 mhz (2) 48 mhz (2) em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 25 of 45 nxp semiconductors em773 energy metering ic conditions: v dd = 3.3 v; sleep mode entered from fl ash; all peripheral s disabled in the ahbclkctrl register (ahbclkctrl = 0x1f); al l peripheral clocks dis abled; internal pull-up resistors disabled; bod disabled. (1) system oscillator and syste m pll disabled; irc enabled. (2) system oscillator and syste m pll enabled; irc disabled. fig 7. sleep mode: typical supply current i dd versus temperature for different system clock frequencies conditions: bod disabled; all oscillators and analog blocks disabled in the pdsleepcfg register (pdsleepcfg = 0xffff fdff). fig 8. deep-sleep mode: typical supply current i dd versus temperature for different supply voltages v dd 002aaf392 temperature ( c) ? 40 85 35 10 60 ? 15 2 6 4 8 i dd (ma) 0 12 mhz (1) 36 mhz (2) 48 mhz (2) 24 mhz (2) 002aaf394 temperature ( c) ? 40 85 35 10 60 ? 15 10 30 20 40 i dd ( a) 0 3.6 v 3.3 v 2.0 v 1.8 v em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 26 of 45 nxp semiconductors em773 energy metering ic 9.3 electrical pi n characteristics fig 9. deep power-down mode: typical supply current i dd versus temperature for different supply voltages v dd 002aaf457 0.2 0.6 0.4 0.8 i dd ( a) 0 temperature ( c) ? 40 85 35 10 60 ? 15 vdd = 3.6 v 3.3 v 2.0 v 1.8 v conditions: v dd = 3.3 v; on pin pio0_7. fig 10. high-drive output: typical high-level output voltage v oh versus high-level output current i oh . i oh (ma) 0 60 40 20 10 50 30 002aae990 2.8 2.4 3.2 3.6 v oh (v) 2 t = 85 c 25 c ? 40 c em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 27 of 45 nxp semiconductors em773 energy metering ic conditions: v dd = 3.3 v; on pins pio0_4 and pio0_5. fig 11. i 2 c-bus pins (high current sink): typical low-level output current i ol versus low-level output voltage v ol conditions: v dd = 3.3 v; standard port pins and pio0_7. fig 12. typical low-l evel output current i ol versus low-level output voltage v ol v ol (v) 0 0.6 0.4 0.2 002aaf019 20 40 60 i ol (ma) 0 t = 85 c 25 c ? 40 c v ol (v) 0 0.6 0.4 0.2 002aae991 5 10 15 i ol (ma) 0 t = 85 c 25 c ? 40 c em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 28 of 45 nxp semiconductors em773 energy metering ic conditions: v dd = 3.3 v; standard port pins. fig 13. typical high-level output voltage v oh versus high-level output source current i oh conditions: v dd = 3.3 v; standard port pins. fig 14. typical pull-up current i pu versus input voltage v i i oh (ma) 0 24 16 8 002aae992 2.8 2.4 3.2 3.6 v oh (v) 2 t = 85 c 25 c ? 40 c v i (v) 0 5 4 23 1 002aae988 ? 30 ? 50 ? 10 10 i pu ( a) ? 70 t = 85 c 25 c ? 40 c em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 29 of 45 nxp semiconductors em773 energy metering ic conditions: v dd = 3.3 v; standard port pins. fig 15. typical pull-down current i pd versus input voltage v i v i (v) 0 5 4 23 1 002aae989 40 20 60 80 i pd ( a) 0 t = 85 c 25 c ? 40 c em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 30 of 45 nxp semiconductors em773 energy metering ic 10. dynamic characteristics 10.1 flash memory [1] number of program/erase cycles. [2] programming times are given for writing 256 bytes from ram to the flash. data must be written to the flash in blocks of 256 bytes. 10.2 external clock [1] parameters are valid over operating temp erature range unless otherwise specified. [2] typical ratings are not guaranteed. the va lues listed are at room temperature (25 c), nominal supply voltages. table 6. flash characteristics t amb = ? 40 c to +85 c, unless otherwise specified. symbol parameter conditions min typ max unit n endu endurance [1] 10000 - - cycles t ret retention time powered 10 - - years unpowered 20 - - years t er erase time sector or multiple consecutive sectors 95 100 105 ms t prog programming time [2] 0.95 1 1.05 ms table 7. dynamic characteristic: external clock t amb = ? 40 c to +85 c; v dd over specified ranges. [1] symbol parameter conditions min typ [2] max unit f osc oscillator frequency 1 - 25 mhz t cy(clk) clock cycle time 40 - 1000 ns t chcx clock high time t cy(clk) 0.4--ns t clcx clock low time t cy(clk) 0.4--ns t clch clock rise time - - 5 ns t chcl clock fall time - - 5 ns fig 16. external clock timing (with an amplitude of at least v i(rms) = 200 mv) t chcl t clcx t chcx t cy(clk) t clch 002aaa907 em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 31 of 45 nxp semiconductors em773 energy metering ic 10.3 internal oscillators [1] parameters are valid over operating temp erature range unless otherwise specified. [2] typical ratings are not guaranteed. the va lues listed are at room temperature (25 c), nominal supply voltages. [1] typical ratings are not guaranteed. the va lues listed are at room temperature (25 c), nominal supply voltages. [2] the typical frequency spread over processing and temperature (t amb = ? 40 c to +85 c) is 40 %. [3] see the em773 user manual . table 8. dynamic characteristic: internal oscillators t amb = ? 40 c to +85 c; 2.7 v v dd 3.6 v. [1] symbol parameter conditions min typ [2] max unit f osc(rc) internal rc oscillator frequency - 11.88 12 12.12 mhz conditions: frequency values are typical values. 12 mhz 1 % accuracy is guaranteed for 2.7 v v dd 3.6 v and t amb = ? 40 c to +85 c. variations between parts may cause the irc to fall outside the 12 mhz 1 % accuracy specification for voltages below 2.7 v. fig 17. internal rc oscillator frequency vs. temperature table 9. dynamic characterist ics: watchdog oscillator symbol parameter conditions min typ [1] max unit f osc internal oscillator frequency divsel = 0x1f, freqsel = 0x1 in the wdtoscctrl register; [2] [3] -7.8 - khz divsel = 0x00, freqsel = 0xf in the wdtoscctrl register [2] [3] - 1700 - khz 002aaf403 11.95 12.05 12.15 f (mhz) 11.85 temperature ( c) ? 40 85 35 10 60 ? 15 vdd = 3.6 v 3.3 v 3.0 v 2.7 v 2.4 v 2.0 v em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 32 of 45 nxp semiconductors em773 energy metering ic 10.4 i/o pins [1] applies to standard port pins and reset pin. 10.5 i 2 c-bus [1] see the i 2 c-bus specification um10204 for details. [2] parameters are valid over operating temp erature range unless otherwise specified. [3] thd;dat is the data hold time that is measured from the falling edge of scl; applies to data in transmission and the acknowledge. [4] a device must internally provide a hold time of at least 300 ns for the sda signal (with respect to the v ih (min) of the scl signal) to bridge the undefined region of the falling edge of scl. [5] c b = total capacitance of one bus line in pf. table 10. dynamic characteristic: i/o pins [1] t amb = ? 40 c to +85 c; 3.0 v v dd 3.6 v. symbol parameter conditions min typ max unit t r rise time pin configured as output 3.0 - 5.0 ns t f fall time pin configured as output 2.5 - 5.0 ns table 11. dynamic characteristic: i 2 c-bus pins [1] t amb = ? 40 c to +85 c. [2] symbol parameter conditions min max unit f scl scl clock frequency standard-mode 0 100 khz fast-mode 0 400 khz fast-mode plus 0 1 mhz t f fall time [4] [5] [6] [7] of both sda and scl signals standard-mode -300ns fast-mode 20 + 0.1 c b 300 ns fast-mode plus - 120 ns t low low period of the scl clock standard-mode 4.7 - s fast-mode 1.3 - s fast-mode plus 0.5 - s t high high period of the scl clock standard-mode 4.0 - s fast-mode 0.6 - s fast-mode plus 0.26 - s t hd;dat data hold time [3] [4] [8] standard-mode 0 - s fast-mode 0 - s fast-mode plus 0 - s t su;dat data set-up time [9] [10] standard-mode 250 - ns fast-mode 100 - ns fast-mode plus 50 - ns em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 33 of 45 nxp semiconductors em773 energy metering ic [6] the maximum t f for the sda and scl bus lines is specified at 300 ns. the maximum fall time for the sda output stage t f is specified at 250 ns. this allows series protection resistors to be connected in between the sda and the scl pins and the sda/scl bus lines without exceeding the maximum specified t f . [7] in fast-mode plus, fall time is specified the same for both output stage and bus timing. if series resistors are used, designers should allow for this when considering bus timing. [8] the maximum t hd;dat could be 3.45 s and 0.9 s for standard-mode and fast-mode but must be less than the maximum of t vd;dat or t vd;ack by a transition time (see um10204 ). this maximum must only be met if the device does not stretch the low period (t low ) of the scl signal. if the clock stretches the scl, the data must be valid by the set-up time before it releases the clock. [9] tsu;dat is the data set-up time that is measured wi th respect to the rising edge of scl; applies to data in transmission and the acknowledge. [10] a fast-mode i 2 c-bus device can be used in a standard-mode i 2 c-bus system but the requirement t su;dat = 250 ns must then be met. this will automatically be the case if the device does not stretch the low period of the scl signal. if such a device does stretch the lo w period of the scl signal, it must output the next data bit to the sda line t r(max) + t su;dat = 1000 + 250 = 1250 ns (according to the standard-mode i 2 c-bus specification) before the scl line is released. also the acknowledge timing must meet this set-up time. 10.6 spi interfaces fig 18. i 2 c-bus pins clock timing 002aaf425 t f 70 % 30 % sda t f 70 % 30 % s 70 % 30 % 70 % 30 % t hd;dat scl 1 / f scl 70 % 30 % 70 % 30 % t vd;dat t high t low t su;dat table 12. dynamic characteristics of spi pins in spi mode symbol parameter conditions min typ max unit spi master (in spi mode) t cy(clk) clock cycle time wh en only receiving [1] 40 - - ns when only transmitting [1] 27.8 ns t ds data set-up time in spi mode 2.4 v v dd 3.6 v [2] 15 - - ns 2.0 v v dd < 2.4 v [2] 20 ns 1.8 v v dd < 2.0 v [2] 24 - - ns t dh data hold time in spi mode [2] 0-- ns t v(q) data output valid time in spi mode [2] --10 ns t h(q) data output hold time in spi mode [2] 0-- ns spi slave (in spi mode) t cy(pclk) pclk cycle time 20 - - ns em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 34 of 45 nxp semiconductors em773 energy metering ic [1] t cy(clk) = (sspclkdiv (1 + scr) cpsdvsr) / f main . the clock cycle time deriv ed from the spi bit rate t cy(clk) is a function of the main clock frequency f main , the spi peripheral clock divider (sspclkdiv), the spi scr parameter (specified in the ssp0cr0 register), and the spi cpsdvsr parameter (specified in the spi clock prescale register). [2] t amb = ? 40 c to 85 c. [3] t cy(clk) = 12 t cy(pclk) . [4] t amb = 25 c; for normal voltage supply range: v dd = 3.3 v. t ds data set-up time in spi mode [3] [4] 0-- ns t dh data hold time in spi mode [3] [4] 3 t cy(pclk) + 4 - - ns t v(q) data output valid time in spi mode [3] [4] --3 t cy(pclk) + 11 ns t h(q) data output hold time in spi mode [3] [4] --2 t cy(pclk) + 5 ns table 12. dynamic characteristics of spi pins in spi mode symbol parameter conditions min typ max unit pin names sck, miso, and mosi refer to pins for both spi peripherals, spi0 and spi1. fig 19. spi master timing in spi mode sck (cpol = 0) mosi miso t cy(clk) t clk(h) t clk(l) t ds t dh t v(q) data valid data valid t h(q) sck (cpol = 1) data valid data valid mosi miso t ds t dh data valid data valid t h(q) data valid data valid t v(q) cpha = 1 cpha = 0 002aae829 em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 35 of 45 nxp semiconductors em773 energy metering ic pin names sck, miso, and mosi refer to pins for both spi peripherals, spi0 and spi1. fig 20. spi slave timing in spi mode sck (cpol = 0) mosi miso t cy(clk) t clk(h) t clk(l) t ds t dh t v(q) data valid data valid t h(q) sck (cpol = 1) data valid data valid mosi miso t ds t dh t v(q) data valid data valid t h(q) data valid data valid cpha = 1 cpha = 0 002aae830 em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 36 of 45 nxp semiconductors em773 energy metering ic 11. application information 11.1 xtal input the input voltage to the on-chip oscillators is limited to 1.8 v. if the oscillator is driven by a clock in slave mode, it is recommended that th e input be coupled through a capacitor with c i = 100 pf. to limit the input voltage to the specified range, choose an additional capacitor to ground c g which attenuates the input voltage by a factor c i /(c i + c g ). in slave mode, a minimum of 200 mv(rms) is needed. in slave mode the input clock signal should be coupled by means of a capacitor of 100 pf ( figure 21 ), with an amplitude between 200 mv(rms) and 1000 mv(rms). this corresponds to a square wave signal with a signal swing of between 280 mv and 1.4 v. the xtalout pin in this configur ation can be left unconnected. external components and models used in oscillation mode are shown in figure 22 and in ta b l e 1 3 and ta b l e 1 4 . since the feedback resistance is integrated on chip, only a crystal and the capacitances c x1 and c x2 need to be connected externally in case of fundamental mode oscillation (the fundamental frequenc y is represen ted by l, c l and r s ). capacitance c p in figure 22 represents the parallel package capacitance and should not be larger than 7 pf. parameters f osc , c l , r s and c p are supplied by the crystal manufacturer (see ta b l e 1 3 ). fig 21. slave mode operation of the on-chip oscillator em773 xtalin c i 100 pf c g em773_002aae788 em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 37 of 45 nxp semiconductors em773 energy metering ic 11.2 xtal printed circuit bo ard (pcb) layout guidelines the crystal should be connected on the pcb as close as poss ible to the oscillator input and output pins of the chip. take care that the load capacitors c x1 , c x2 , and c x3 in case of third overtone crystal usage have a common ground plane. the external components must also be connected to the ground plain. loops must be made as small as possible in fig 22. oscillator modes and models: oscillation mode of operation and external crystal model used for c x1 /c x2 evaluation table 13. recommended values for c x1 /c x2 in oscillation mode (crystal and external components parameters) low frequency mode fundamental oscillation frequency f osc crystal load capacitance c l maximum crystal series resistance r s external load capacitors c x1 , c x2 1 mhz - 5 mhz 10 pf < 300 18 pf, 18 pf 20 pf < 300 39 pf, 39 pf 30 pf < 300 57 pf, 57 pf 5 mhz - 10 mhz 10 pf < 300 18 pf, 18 pf 20 pf < 200 39 pf, 39 pf 30 pf < 100 57 pf, 57 pf 10 mhz - 15 mhz 10 pf < 160 18 pf, 18 pf 20 pf < 60 39 pf, 39 pf 15 mhz - 20 mhz 10 pf < 80 18 pf, 18 pf table 14. recommended values for c x1 /c x2 in oscillation mode (crystal and external components parameters) high frequency mode fundamental oscillation frequency f osc crystal load capacitance c l maximum crystal series resistance r s external load capacitors c x1 , c x2 15 mhz - 20 mhz 10 pf < 180 18 pf, 18 pf 20 pf < 100 39 pf, 39 pf 20 mhz - 25 mhz 10 pf < 160 18 pf, 18 pf 20 pf < 80 39 pf, 39 pf em773_002aaf424 em773 xtalin xtalout c x2 c x1 xtal = c l c p r s l em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 38 of 45 nxp semiconductors em773 energy metering ic order to keep the noise coupled in via the pcb as small as possible. also parasitics should stay as small as possible. values of c x1 and c x2 should be chosen smaller accordingly to the increase in parasitics of the pcb layout. 11.3 standard i/o pad configuration figure 23 shows the possible pin modes for standard i/o pins with analog input function: ? digital output driver ? digital input: pull-up enabled/disabled ? digital input: pull-down enabled/disabled ? digital input: repeater mode enabled/disabled ? analog input fig 23. standard i/o pad configuration pin v dd esd v ss esd v dd weak pull-up weak pull-down output enable repeater mode enable output pull-up enable pull-down enable data input analog input select analog input 002aaf304 pin configured as digital output driver pin configured as digital input pin configured as analog input em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 39 of 45 nxp semiconductors em773 energy metering ic 11.4 reset pad configuration fig 24. reset pad configuration v ss reset 002aaf274 v dd v dd v dd r pu esd esd 20 ns rc glitch filter pin em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 40 of 45 nxp semiconductors em773 energy metering ic 12. package outline fig 25. package outline (hvqfn33) references outline version european projection issue date iec jedec jeita - - - hvqfn33_po 09-03-17 09-03-23 unit mm max nom min 1.00 0.85 0.80 0.05 0.02 0.00 0.2 7.1 7.0 6.9 4.85 4.70 4.55 7.1 7.0 6.9 0.65 4.55 0.75 0.60 0.45 0.1 a (1) dimensions note 1. plastic or metal protrusions of 0.075 mm maximum per side are not included. hvqfn33: plastic thermal enhanced very thin quad flat package; no leads; 33 terminals; body 7 x 7 x 0.85 mm a 1 b 0.35 0.28 0.23 cd (1) d h e (1) e h 4.85 4.70 4.55 ee 1 e 2 4.55 lv 0.1 w 0.05 y 0.08 y 1 0 2.5 5 mm scale terminal 1 index area b a d e c y c y 1 x detail x a 1 a c b e 2 e 1 e e a c b v c w terminal 1 index area d h e h l 9 16 32 33 25 17 24 8 1 em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 41 of 45 nxp semiconductors em773 energy metering ic 13. abbreviations table 15. abbreviations acronym description ahb advanced high-performance bus amba advanced microcontroller bus architecture apb advanced peripheral bus bod brownout detection gpio general purpose input/output pll phase-locked loop rc resistor-capacitor spi serial peripheral interface ssi serial synchronous interface ssp synchronous serial port ttl transistor-transistor logic uart universal asynchronous receiver/transmitter em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 42 of 45 nxp semiconductors em773 energy metering ic 14. revision history table 16. revision history document id release date data sheet status change notice supersedes em773 v.1 em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 43 of 45 nxp semiconductors em773 energy metering ic 15. legal information 15.1 data sheet status [1] please consult the most recently issued document before initiating or completing a design. [2] the term ?short data sheet? is explained in section ?definitions?. [3] the product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple device s. the latest product status information is available on the internet at url http://www.nxp.com . 15.2 definitions draft ? the document is a draft versi on only. the content is still under internal review and subject to formal approval, which may result in modifications or additions. nxp semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall hav e no liability for the consequences of use of such information. short data sheet ? a short data sheet is an extract from a full data sheet with the same product type number(s) and title. a short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. for detailed and full information see the relevant full data sheet, which is available on request vi a the local nxp semiconductors sales office. in case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. product specification ? the information and data provided in a product data sheet shall define the specification of the product as agreed between nxp semiconductors and its customer , unless nxp semiconductors and customer have explicitly agreed otherwis e in writing. in no event however, shall an agreement be valid in which the nxp semiconductors product is deemed to offer functions and qualities beyond those described in the product data sheet. 15.3 disclaimers limited warranty and liability ? information in this document is believed to be accurate and reliable. however, nxp semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. in no event shall nxp semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interrupt ion, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. notwithstanding any damages that customer might incur for any reason whatsoever, nxp semiconductors? aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the terms and conditions of commercial sale of nxp semiconductors. right to make changes ? nxp semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof. suitability for use ? nxp semiconductors products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or malfunction of an nxp semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. nxp semiconductors accepts no liability for inclusion and/or use of nxp semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer?s own risk. applications ? applications that are described herein for any of these products are for illustrative purpos es only. nxp semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. customers are responsible for the design and operation of their applications and products using nxp semiconductors products, and nxp semiconductors accepts no liability for any assistance with applications or customer product design. it is customer?s sole responsibility to determine whether the nxp semiconductors product is suitable and fit for the customer?s applications and products planned, as well as fo r the planned application and use of customer?s third party customer(s). customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. nxp semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer?s applications or products, or the application or use by customer?s third party customer(s). customer is responsible for doing all necessary testing for the customer?s applic ations and products using nxp semiconductors products in order to av oid a default of the applications and the products or of the application or use by customer?s third party customer(s). nxp does not accept any liability in this respect. limiting values ? stress above one or more limiting values (as defined in the absolute maximum ratings system of iec 60134) will cause permanent damage to the device. limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the recommended operating conditions section (if present) or the characteristics sections of this document is not warranted. constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. terms and conditions of commercial sale ? nxp semiconductors products are sold subject to the gener al terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms , unless otherwise agreed in a valid written individual agreement. in case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. nxp semiconductors hereby expressly objects to applying the customer?s general terms and conditions with regard to the purchase of nxp semiconducto rs products by customer. no offer to sell or license ? nothing in this document may be interpreted or construed as an offer to sell products t hat is open for acceptance or the grant, conveyance or implication of any lic ense under any copyrights, patents or other industrial or intellectual property rights. export control ? this document as well as the item(s) described herein may be subject to export control regulations. export might require a prior authorization from national authorities. document status [1] [2] product status [3] definition objective [short] data sheet development this document contains data from the objecti ve specification for product development. preliminary [short] data sheet qualification this document contains data from the preliminary specification. product [short] data sheet production this docu ment contains the product specification. em773 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2010. all rights reserved. objective data sheet rev. 1 ? 1 september 2010 44 of 45 nxp semiconductors em773 energy metering ic non-automotive qualified products ? unless this data sheet expressly states that this specific nxp semicon ductors product is automotive qualified, the product is not suitable for automotive use. it is neither qualified nor tested in accordance with automotive testing or application requirements. nxp semiconductors accepts no liabili ty for inclusion and/or use of non-automotive qualified products in automotive equipment or applications. in the event that customer uses t he product for design-in and use in automotive applications to automotive s pecifications and standards, customer (a) shall use the product without nxp semiconductors? warranty of the product for such automotive applicat ions, use and specifications, and (b) whenever customer uses the product for automotive applications beyond nxp semiconductors? specifications such use shall be solely at customer?s own risk, and (c) customer fully indemnifies nxp semiconductors for any liability, damages or failed product claims resulting from customer design and use of the product for automotive app lications beyond nxp semiconductors? standard warranty and nxp semiconduct ors? product specifications. 15.4 trademarks notice: all referenced brands, produc t names, service names and trademarks are the property of their respective owners. 16. contact information for more information, please visit: http://www.nxp.com for sales office addresses, please send an email to: salesaddresses@nxp.com nxp semiconductors em773 energy metering ic ? nxp b.v. 2010. all rights reserved. for more information, please visit: http://www.nxp.com for sales office addresses, please se nd an email to: salesaddresses@nxp.com date of release: 1 september 2010 document identifier: em773 please be aware that important notices concerning this document and the product(s) described herein, have been included in section ?legal information?. 17. contents 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features and benefits . . . . . . . . . . . . . . . . . . . . 1 3 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 ordering information . . . . . . . . . . . . . . . . . . . . . 2 5 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3 6 pinning information . . . . . . . . . . . . . . . . . . . . . . 4 6.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 6.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5 7 functional description . . . . . . . . . . . . . . . . . . . 8 7.1 arm cortex-m0 processor . . . . . . . . . . . . . . . . 8 7.2 on-chip flash program memory . . . . . . . . . . . . 8 7.3 on-chip sram . . . . . . . . . . . . . . . . . . . . . . . . . 8 7.4 memory map. . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7.5 nested vectored interrupt controller (nvic) . . 9 7.5.1 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7.5.2 interrupt sources. . . . . . . . . . . . . . . . . . . . . . . 10 7.6 ioconfig block . . . . . . . . . . . . . . . . . . . . . . 10 7.7 fast general purpose parallel i/o . . . . . . . . . . 10 7.7.1 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.8 uart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.8.1 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7.9 spi serial i/o controller. . . . . . . . . . . . . . . . . . 11 7.9.1 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7.10 i 2 c-bus serial i/o controller . . . . . . . . . . . . . . 11 7.10.1 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.11 metrology engine . . . . . . . . . . . . . . . . . . . . . . 12 7.11.1 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.12 general purpose external event counter/timers . . 12 7.12.1 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.13 system tick timer . . . . . . . . . . . . . . . . . . . . . . 13 7.14 watchdog timer. . . . . . . . . . . . . . . . . . . . . . . . 13 7.14.1 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7.15 clocking and power control . . . . . . . . . . . . . . 13 7.15.1 crystal oscillators . . . . . . . . . . . . . . . . . . . . . . 13 7.15.1.1 internal rc oscillator . . . . . . . . . . . . . . . . . . . 14 7.15.1.2 system oscillator . . . . . . . . . . . . . . . . . . . . . . 14 7.15.1.3 watchdog oscillator . . . . . . . . . . . . . . . . . . . . 15 7.15.2 system pll . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7.15.3 clock output . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7.15.4 wake-up process . . . . . . . . . . . . . . . . . . . . . . 15 7.15.5 power control . . . . . . . . . . . . . . . . . . . . . . . . . 15 7.15.5.1 sleep mode . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7.15.5.2 deep-sleep mode . . . . . . . . . . . . . . . . . . . . . . 16 7.15.5.3 deep power-down mode . . . . . . . . . . . . . . . . 16 7.16 system control . . . . . . . . . . . . . . . . . . . . . . . . 16 7.16.1 start logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.16.2 reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.16.3 brownout detection . . . . . . . . . . . . . . . . . . . . 16 7.16.4 code security (code read protection - crp) 17 7.16.5 apb interface . . . . . . . . . . . . . . . . . . . . . . . . . 17 7.16.6 ahblite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7.16.7 external interr upt inputs . . . . . . . . . . . . . . . . . 17 7.17 emulation and debugging . . . . . . . . . . . . . . . 17 8 limiting values . . . . . . . . . . . . . . . . . . . . . . . . 18 9 static characteristics . . . . . . . . . . . . . . . . . . . 19 9.1 bod static characteristics . . . . . . . . . . . . . . . 23 9.2 power consumption . . . . . . . . . . . . . . . . . . . 23 9.3 electrical pin characteristics. . . . . . . . . . . . . . 26 10 dynamic characteristics. . . . . . . . . . . . . . . . . 30 10.1 flash memory . . . . . . . . . . . . . . . . . . . . . . . . 30 10.2 external clock. . . . . . . . . . . . . . . . . . . . . . . . . 30 10.3 internal oscillators . . . . . . . . . . . . . . . . . . . . . 31 10.4 i/o pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 10.5 i 2 c-bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 10.6 spi interfaces. . . . . . . . . . . . . . . . . . . . . . . . . 33 11 application information . . . . . . . . . . . . . . . . . 36 11.1 xtal input . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 11.2 xtal printed circuit board (pcb) layout guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 11.3 standard i/o pad configuration . . . . . . . . . . . 38 11.4 reset pad configuration . . . . . . . . . . . . . . . . . 39 12 package outline. . . . . . . . . . . . . . . . . . . . . . . . 40 13 abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 41 14 revision history . . . . . . . . . . . . . . . . . . . . . . . 42 15 legal information . . . . . . . . . . . . . . . . . . . . . . 43 15.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 43 15.2 definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 15.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 43 15.4 trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 44 16 contact information . . . . . . . . . . . . . . . . . . . . 44 17 contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 |
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