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1c accurate, 13-bit, digital temperature sensor adt7301 rev. a information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ?2005C2010 analog devices, inc. all rights reserved. features 13-bit temperature-to-digital converter ?40c to +150c operating temperature range 0.5c typical accuracy 0.03125c temperature resolution shutdown current of 1 a power dissipation of 0.631 mw at v dd = 3.3 v spi- and dsp-compatible serial interface shutdown mode space-saving sot-23 and msop packages compatible with ad7814 applications medical equipment automotive environmental controls oil temperature hydraulic systems cellular phones hard disk drives personal computers electronic test equipment office equipment domestic appliances process control functional block diagram serial bus interface 02884-0-001 adt7301 v dd sclk din dout gnd 13-bit analog/digital converter temperature value register band gap temperature sensor cs figure 1. general description the adt7301 is a complete temperature monitoring system available in sot-23 and msop packages. it contains a band gap temperature sensor and a 13-bit adc to monitor and digitize the temperature reading to a resolution of 0.03125c. the adt7301 has a flexible serial interface that allows easy interfacing to most microcontrollers. the interface is compati- ble with spi ? , qspi ? , and microwire ? protocols as well as dsps. the part features a standby mode that is controlled via the serial interface. the adt7301s wide supply voltage range, low supply current, and spi-compatible interface make it ideal for a variety of applications including personal computers, office equipment, automotive, and domestic appliances. the adt7301 is rated for operation over the ?40c to +150c temperature range. it is not recommended to operate the device at temperatures above +125c for greater than a total of 5% (5,000 hours) of the lifetime of the device. exposure beyond this limit affects device reliability. product highlights 1. on-chip temperature sensor that allows an accurate measurement of the ambient temperature. the measurable temperature range is ?40c to +150c. 2. supply voltage of 2.7 v to 5.25 v. 3. space-saving 6-lead sot-23 and 8-lead msop packages. 4. typical temperature accuracy of 0.5c. 5. 13-bit temperature reading to 0.03125c resolution. 6. shutdown mode that reduces the power consumption to 4.88 w with v dd = 3.3 v @ 1 sps. 7. compatible with ad7814.
adt7301 rev. a | page 2 of 16 table of contents features .............................................................................................. 1 ? applications ....................................................................................... 1 ? functional block diagram .............................................................. 1 ? general description ......................................................................... 1 ? product highlights ........................................................................... 1 ? revision history ............................................................................... 2 ? specifications ..................................................................................... 3 ? timing characteristics ................................................................ 4 ? absolute maximum ratings ............................................................ 5 ? esd caution .................................................................................. 5 ? pin configurations and function descriptions ........................... 6 ? typical performance characteristics ..............................................7 ? theory of operation .........................................................................9 ? converter details ..........................................................................9 ? temperature value register ...................................................... 10 ? serial interface ............................................................................ 11 ? applications information .............................................................. 12 ? microprocessor interfacing ....................................................... 12 ? mounting the adt7301 ............................................................ 14 ? supply decoupling ..................................................................... 14 ? outline dimensions ....................................................................... 15 ? ordering guide .......................................................................... 15 ? revision history 3/10rev. 0 to rev. a change to autoconversion update rate parameter, table 1 ...... 3 changes to converter details section ........................................... 9 updated outline dimensions ....................................................... 15 10/05revision 0: initial version
adt7301 rev. a | page 3 of 16 specifications t a = t min to t max , v dd = 2.7 v to 5.25 v, unless otherwise noted. all specifications are for ?40c to +150c, unless otherwise noted. table 1. a grade specifications parameter min typ max unit test conditions/comments temperature sensor and adc v dd = 3.3 v (10%) and 5 v (5%) accuracy 1 0.5 1 c t a = 0c to 70c 2 c t a = ?20c to +85c 3 c t a = ?40c to +125c 4 2 c t a = ?40c to +150c temperature resolution 0.03125 c autoconversion update rate, t r 1.5 sec temperature measurement every 1.5 second temperature conversion time 800 s thermal time constant 3 2 sec supplies supply voltage 2.7 5.25 v for specified performance supply current normal mode 1.6 2.2 ma v dd = 3.3 v, powered up and converting 190 300 a v dd = 3.3 v, powered up and not converting 1.6 2.2 ma v dd = 5 v, powered up and converting 280 400 a v dd = 5 v, powered up and not converting shutdown mode 0.2 1 a v dd = 3.3 v, t a = 0c to 70c 0.4 2 a v dd = 5 v, t a = 0c to 70c 20 a v dd = 2.7 v to 5.25 v, t a = ?40c to +150c power dissipation normal mode (average) 631 w v dd = 3.3 v, autoconversion update, t r 1.41 mw v dd = 5 v, autoconversion update, t r shutdown mode (average) 4 1 sps 4.88 w v dd = 3.3 v 7.4 w v dd = 5 v 10 sps 42.9 w v dd = 3.3 v 65 w v dd = 5 v 100 sps 423 w v dd = 3.3 v 641 w v dd = 5 v digital input 5 input high voltage, v ih 2.5 v input low voltage, v il 0.8 v input current, i in 1 a v in = 0 v to v dd input capacitance, c in 10 pf all digital inputs digital output 5 output high voltage, v oh v dd ? 0.3 v i source = i sink = 200 a output low voltage, v ol 0.4 v i ol = 200 a output capacitance, c out 50 pf 1 the accuracy specifications for 0c to 70c are specified to 3.5- performance. 2 it is not recommended to operate the device at temperatures above 125c for greater than a total of 5% (5,000 hours) of the li fetime of the device. any exposure beyond this limit affects device reliability. 3 the thermal time constant is the time it takes for a temperature delta to change to 63.2% of its final value. for example, if the adt7301 experiences a thermal shock from 0c to 100c, it would take typically 2 seconds for the adt7301 to reach 63.2c. 4 the adt7301 is taken out of shutdown mode and a temperature co nversion is immediately performed after this write operation. wh en the temperature conversion is complete, the adt7301 is put back into shutdown mode. 5 guaranteed by design and characterization, not production tested.
adt7301 rev. a | page 4 of 16 timing characteristics guaranteed by design and characterization, not production tested. all input signals are specified with t r = t f = 5 ns (10% to 90% of v dd ) and timed from a voltage level of 1.6 v. t a = t min to t max , v dd = 2.7 v to 5.25 v, unless otherwise noted. table 2. parameter 1 limit unit comments t 1 5 ns min cs to sclk setup time t 2 25 ns min sclk high pulse width t 3 25 ns min sclk low pulse width t 4 2 35 ns max data access time after sclk falling edge t 5 20 ns min data setup time prior to sclk rising edge t 6 5 ns min data hold time after sclk rising edge t 7 5 ns min cs to sclk hold time t 8 2 40 ns max cs to dout high impedance 1 see figure 14 for the spi timing diagram. 2 measured with the load circuit of figure 2. 1.6v 200 a 200 ai oh i ol 02884-0-002 to output pin c l 50pf figure 2. load circuit for data access time and bus relinquish time
adt7301 rev. a | page 5 of 16 absolute maximum ratings table 3. parameter rating v dd to gnd ?0.3 v to +7 v digital input voltage to gnd ?0.3 v to v dd + 0.3 v digital output voltage to gnd ?0.3 v to v dd + 0.3 v operating temperature range 1 ?40c to +150c storage temperature range ?65c to +150c junction temperature 150c 6-lead sot-23 (rj-6) power dissipation 2 w max = (t j max ? t a 3 )/ ja thermal impedance ja , junction-to-ambient (still air) 190.4c/w 8-lead msop (rm-8) power dissipation 2 w max = (t j max ? t a 3 )/ ja thermal impedance 4 ja , junction-to-ambient (still air) 205.9c/w jc , junction-to-case 43.74c/w ir reflow soldering peak temperature 220c (0c/5c) time at peak temperature 10 sec to 20 sec ramp-up rate 3c/s max ramp-down rate ?6c/s max time 25c to peak temperature 6 minutes max ir reflow solderingpb-free package peak temperature 260c (0c) time at peak temperature 20 sec to 40 sec ramp-up rate 3c/s max ramp-down rate ?6c/s max time 25c to peak temperature 8 minutes max 1 it is not recommended to operate the adt7301 at temperatures above 125c for greater than a total of 5% (5 ,000 hours) of the lifetime of the device. any exposure beyond this limit affects device reliability. 2 values relate to the package being used on a standard 2-layer pcb. refer to figure 3 for a plot of maximum power dissipation vs. ambient temperature (t a ). 3 t a = ambient temperature. 4 junction-to-case resistance is applicable to components featuring a preferential flow direction, for examp le, components mounted on a heat sink. junction-to-ambient resistance is more useful for air-cooled, pcb-mounted components. stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. 02884-003 temperature (c) ?40 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 ?10 ?20 ?30 maximum power dissipation (w) 1.2 1.0 0.8 0.6 0.4 0.2 0 sot-23 msop figure 3. plot of maximum power dissipation vs. temperature esd caution
adt7301 rev. a | page 6 of 16 pin configurations and function descriptions 1 2 3 gnd top view (not to scale) 02884-0-004 6 5 4 adt7301 din v dd dout cs sclk figure 4. sot-23 pin configuration 1 2 3 4 nc top view (not to scale) 8 7 6 5 adt7301 dout nc gnd sclk v dd din 02884-0-005 cs figure 5. msop pin configuration table 4. pin function descriptions sot-23 pin no. msop pin no. mnemonic description 1 7 gnd analog and digital ground. 2 6 din serial data input. se rial data to be loaded to the parts cont rol register is provided on this input. data is clocked into the control register on the rising edge of sclk. 3 5 v dd positive supply voltage, 2.7 v to 5.25 v. 4 4 sclk serial clock input. this is the clock input for the serial port. the serial clock is used to clock data out of the adt7301s temperature value register and to clock data into the adt7301s control register. 5 3 cs chip select input. logic input. the device is sele cted when this input is low. the sclk input is disabled when this pin is high. 6 2 dout serial data output. logic output. da ta is clocked out of the temperature value register at this pin. data is clocked out on the falling edge of sclk. 1, 8 nc no connect.
adt7301 rev. a | page 7 of 16 typical performance characteristics temperature (c) current ( a) 215 210 205 195 190 185 200 180 170 175 ?45 5 55 105 155 02884-018 5.5v 3.3v figure 6. average operating supply current vs. temperature supply voltage (v) current ( a) 205 200 190 185 195 175 180 2.5 3.0 3.5 5.0 4.0 4.5 5.5 6.0 02884-019 figure 7. average operating supply current vs. supply voltage @ 30c supply voltage (v) shutdown current (na) 500 450 250 300 200 150 350 400 0 100 50 2.5 3.0 3.5 5.0 4.0 4.5 5.5 6.0 02884-020 figure 8. shutdown current vs. supply voltage @ 30c frequency (hz) temperature error ( c) 20 5 0 10 15 ?10 ?5 10k 100k 1m 10m 100m 02884-021 250mv p-p ripple @ v dd = 5v figure 9. temperature accuracy vs. supply ripple frequency time (sec) temperature ( c) 140 60 80 40 100 120 0 20 01 0 51 52 5 20 403530 45 50 02884-022 figure 10. response to thermal shock
adt7301 rev. a | page 8 of 16 temperature ( c) temperature error ( c) 5 3 4 1 2 0 ?4 ?3 ?2 ?1 ?5 ?40 ?30 ?20 ?10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 02884-006 upper temperature error limit lower temperature error limit figure 11. temperature accuracy of 40 adt7301s @ 3.3 v temperature ( c) temperature error ( c) 5 3 4 1 2 0 ?4 ?3 ?2 ?1 ?5 ?40 ?30 ?20 ?10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 02884-023 upper temperature error limit lower temperature error limit figure 12. temperature accuracy of 40 adt7301s @ 5 v
adt7301 rev. a | page 9 of 16 theory of operation the adt7301 is a 13-bit digital temperature sensor with a 14 th bit that acts as a sign bit. the part houses an on-chip temperature sensor, a 13-bit a/d converter, a reference circuit, and serial interface logic functions in sot-23 and msop packages. the adc section consists of a conventional successive approximation converter based around a capacitor dac. the parts run on a 2.7 v to 5.25 v power supply. the on-chip temperature sensor allows an accurate measure- ment of the ambient device temperature to be made. the specified measurement range of the adt7301 is ?40c to +150c. greater than 125c, the adt7301 is limited to 5% of its 55c operational lifetime. the structural integrity of the device may start to deteriorate when continuously operated at absolute maximum voltage and temperature specifications. converter details the conversion clock for the part is internally generated. no external clock is required except when reading from and writing to the serial port. in normal mode, an internal clock oscillator runs an automatic conversion sequence. during this automatic conversion sequence, a conversion is initiated every 1.5 second. at this time, the part powers up its analog circuitry and performs a temperature conversion. this temperature conversion typically takes 800 s, after which the analog circuitry of the part auto- matically shuts down. the analog circuitry powers up again when the 1.5 second timer times out and the next conversion begins. since the serial interface circuitry never shuts down, the result of the most recent temperature conversion is always available in the serial output register. the adt7301 can be placed into shutdown mode via the control register. this means that the on-chip oscillator is shut down and no further conversions are initiated until the adt7301 is taken out of shutdown mode. the adt7301 can be taken out of shutdown mode by writing all 0s into the control register. the conversion result from the last conversion prior to shutdown can still be read from the adt7301 even when it is in shutdown mode. in normal conversion mode, the internal clock oscillator is reset after every read or write operation. this causes the device to start a temperature conversion, the result of which is typically available 800 s later. similarly, when the part is taken out of shutdown mode, the internal clock oscillator is started and a conversion is initiated. the conversion result is available 800 s later. every result is stored in a buffer register and is loaded into the temperature value register only at the first falling sclk edge of every serial port activity. serial port activity does not interfere with conversion processes, and every conversion is completed, even during a read operation. a conversion has to be completed before a read occurs, otherwise its result is not loaded into the temperature value register and instead is loaded into the buffer register. a new conversion is triggered at the end of each serial port activity, except when a conversion is already in progress.
adt7301 rev. a | page 10 of 16 temperature value register the temperature value register is a 14-bit read - only register that stores the temperature reading from the adc in 13-bit twos complement format plus a sign bit. the msb (db13) is the sign bit. the adc can theoretically measure a 255c temperature span. the internal temperature sensor is guaranteed to a low value limit of ?40c and a high limit of +150c. the temperature data format is shown in table 5 , which shows the temperature measurement range of the device (?40c to +150c). the typical performance curve is shown in figure 11 . table 5. temperature data format temperature digital output db13 db0 ?40c 11, 1011 0000 0000 ?30c 11, 1100 0100 0000 ?25c 11, 1100 1110 0000 ?10c 11, 1110 1100 0000 ?0.03125c 11, 1111 1111 1111 0c 00, 0000 0000 0000 +0.03125c 00, 0000 0000 0001 +10c 00, 0001 0100 0000 +25c 00, 0011 0010 0000 +50c 00, 0110 0100 0000 +75c 00, 1001 0110 0000 +100c 00, 1100 1000 0000 +125c 00, 1111 1010 0000 +150c 01, 0010 1100 0000 temperature conversion equations positive temperature = adc code ( d )/32 negative temperature = ( adc code( d ) 1 ? 16384)/32 negative temperature = ( adc code( d ) 2 ? 8192)/32 digital output ?40c ?0.03125c ?30c 11, 1111, 1111, 1111 11, 1100, 0100, 0000 11, 1011, 0000, 0000 temperature (c) 75c 02884-0-006 150c 01, 0010, 1100, 0000 00, 1001, 0110, 0000 00, 0000, 0000, 0001 figure 13. temperature-to-digital transfer function 1 adc code uses all 14 bits of the data byte, including the sign bit. 2 db13 (the sign bit) is removed from the adc code.
adt7301 rev. a | page 11 of 16 sclk dout din power- down leading zeros db13 db0 1 23 4 15 16 t 1 t 2 t 3 t 4 t 6 t 5 t 7 t 8 db12 db1 db0 02884-0-007 cs figure 14. serial interface timing diagram serial interface the serial interface on the adt7301 consists of four wires: cs , sclk, din, and dout. the interface can be operated in 3-wire mode with din tied to ground, in which case the inter- face has read - only capability, with data being read from the data register via the dout line. it is advisable to always use cs to create a communications window, as shown in ; this improves synchronization between the adt7301 and the master device. the din line is used to write the part into standby mode, if required. the figure 14 cs line is used to select the device when more than one device is connected to the serial clock and data lines. the part operates in a slave mode and requires an externally applied serial clock to the sclk input to access data from the data register. the serial interface on the adt7301 allows the part to be interfaced to systems that provide a serial clock synchronized to the serial data, such as the 80c51, 87c51, 68hc11, 68hc05, and pic16cxx microcontrollers as well as dsp processors. a read operation from the adt7301 accesses data from the temperature value register, while a write operation to the part writes data to the control register. read operation figure 14 shows the timing diagram for a serial read from the adt7301. the cs line enables the sclk input. thirteen bits of data plus a sign bit are transferred during a read operation. read operations occur during streams of 16 clock pulses. the first 2 bits out are leading zeros and the next 14 bits contain the temperature data. if cs remains low and 16 more sclk cycles are applied, the adt7301 loops around and outputs the two leading zeros plus the 14 bits of data that are in the temp- erature value register. when cs returns high, the dout line goes into three-state. data is clocked out onto the dout line on the falling edge of sclk. write operation figure 14 also shows the timing diagram for a serial write to the adt7301. the write operation takes place at the same time as the read operation. only the third bit in the data stream provides a user-controlled function. this third bit is the power-down bit, which, when set to 1, puts the adt7301 into shutdown mode. in addition to the power-down bit, all bits in the input data stream should be 0 to ensure correct operation of the adt7301. data is loaded into the control register on the 16 th rising sclk edge; the data takes effect at this time. therefore, if the part is programmed to go into shutdown, it does so at this point. if cs is brought high before this 16 th sclk edge, the control register is not loaded and the power-down status of the part does not change. data is clocked into the adt7301 on the rising edge of sclk.
adt7301 rev. a | page 12 of 16 applications information microprocessor interfacing the adt7301 serial interface allows easy interface to most microcomputers and microprocessors. figure 15 to figure 18 show some typical interface circuits. the serial interface on the adt7301 consists of four wires: cs , din, dout, and sclk. all interface circuits shown use all four interface lines. however, it is possible to operate the interface with three wires. if the application does not require the power-down facility offered by the adt7301, the din line can be tied low permanently. thus, the interface can be operated from just three wires: sclk, cs , and dout. the serial data transfer to and from the adt7301 requires a 16-bit read operation. many 8-bit microcontrollers have 8-bit serial ports, and this 16-bit data transfer is handled as two 8-bit transfers. other microcontrollers and dsp processors transfer 16 bits of data in a serial data operation. adt7301-to-mc68hc11 interface figure 15 shows an interface circuit between the adt7301 and the mc68hc11 microcontroller. the mc68hc11 is configured in master mode with its cpol and cpha bits set to a logic 1. when the mc68hc11 is configured like this, its sclk line idles high between data transfers. data is transferred to and from the adt7301 in two 8-bit serial data operations. figure 15 shows the full (4-wire) interface. pc1 of the mc68hc11 is configured as an output and is used to drive the cs input. adt7301* sclk dout din mc68hc11* sclk miso mosi pc1 02884-0-008 *additional pins omitted for clarity cs figure 15. adt7301-to-mc68hc11 interface adt7301-to-8051 interface figure 16 shows an interface circuit between the adt7301 and the microcontroller. the 8051 is configured in its mode 0 serial interface mode. the serial clock line of the 8051 (on p3.1) idles high between data transfers. data is transferred to and from the adt7301 in two 8-bit serial data operations. the adt7301 outputs the msb of its data stream as the first valid bit while the 8051 expects the lsb first. thus, the data read into the serial buffer needs to be rearranged before the correct data-word from the adt7301 is available in the accumulator. in the example shown in figure 16 , the adt7301 is connected to the serial port of the 8051. because the serial interface of the 8051 contains only one data line, the din line of the adt7301 is tied low in figure 16 . for applications that require the adt7301 power-down feature, the serial interface should be implemented using data port lines on the 8051. this allows a full-duplex serial interface to be implemented. the method involves generating a serial clock on one port line while using two other port lines to shift data in and out with the fourth port line connecting to cs . port lines 1.0 to 1.3 (with p1.1 configured as an input) can be used to connect to sclk, dout, din, and cs , respectively, to implement this scheme. adt7301* 02884-0-009 sclk dout din 8051* p3.1 p3.0 p1.2 p1.3 *additional pins omitted for clarity cs figure 16. adt7301-to-8051 interface adt7301-to-pic16c6x/7x interface figure 17 shows an interface circuit between the adt7301 and the pic16c6x/7x microcontroller. the pic16c6x/7x synchro- nous serial port (ssp) is configured as an spi master with the clock polarity bit set to a logic 1. in this mode, the serial clock line of the pic16c6x/7x idles high between data transfers. data is transferred to and from the adt7301 in two 8-bit serial data operations. in the example shown in figure 17 , port line ra1 is being used to generate the cs for the adt7301. adt7301* sclk dout din pic16c6x/7x* sck sdo sdi ra1 02884-0-010 *additional pins omitted for clarity cs figure 17. adt7301-to-pic16c6x/7x interface
adt7301 rev. a | page 13 of 16 the following software program shows how to program a pic16f873 to communicate with the adt7301. the pic16f873 is configured as an spi master with the port a.1 pin used as cs . any microchip microcontroller can use this program by simply exchanging the include file for the device that is being used. #include <16f873.h> #device adc = 8 #use delay(clock = 4000000) #fuses nowdt,xt, put, noprotect, brownout, lvp #bit ckp = 0x14.4 #define cs pin_a1 void main(){ int msbyte,lsbyte; long int adc_temp_code; float tempval,adc_temp_code_dec; setup_spi(spi_master); //pic is set up as master device. ckp = 1; //idle state of clock is high. do{ delay_ms(10); //allow time for conversions. output_low(cs); //pull cs low. delay_us(10); //cs to sclk set-up time. msbyte = spi_read(0); //the first byte is clocked in. lsbyte = spi_read(0); //the second byte is clocked in. delay_us(10); //sclk to cs set-up time. output_high(cs); //bring cs high. adc_temp_code = make16(msbyte,lsbyte); //16 bit adc code is stored adc_temp_code. adc_temp_code_dec = (float)adc_temp_code; //co n vert to float for division. if ((0x2000 & adc_temp_code) == 0x2000) //check sign bit for negative value. { tempval = (adc_temp_code_dec - 16384)/32; //conversion formula if negative temperature. } else { tempval = (adc_temp_code_dec/32); //conversion formula if positive temperature. } }while(true); //temperature value stored in tempval. }
adt7301 rev. a | page 14 of 16 adt7301-to-adsp-21xx interface figure 18 shows an interface between the adt7301 and the adsp-21xx dsp processor. to ensure correct operation of the interface, the sport control register should be set up as follows: tfsw = rfsw = 1, alternate framing invrfs = invtfs = 1, active low framing signal dtype = 00, right justify data slen = 1111, 16-bit data-words isclk = 1, internal serial clock tfsr = rfs = 1, frame every word irfs = 0, rfs configured as input itfs = 1, tfs configured as output the interface requires an inverter between the sclk line of the adsp-21xx and the sclk input of the adt7301. on the adsp-21xx interface, the tfs and rfs of the sport are tied together; tfs is set as an output, and rfs is set as an input. the dsp operates in alternate framing mode and the sport control register is set up as described in this section. adt7301* sclk dout din adsp-21xx* sck dr dt rfs 02884-0-011 *additional pins omitted for clarity tfs cs figure 18. adt7301-to-adsp-21xx interface mounting the adt7301 the adt7301 can be used for surface or air temperature sensing applications. if the device is cemented to a surface with a thermally conductive adhesive, the die temperature will be within about 0.1c of the surface temperature because of the adt7301s low power consumption. care should be taken to insulate the back and leads of the device if the ambient air temperature is different from the surface temperature being measured. the ground pin provides the best thermal path to the die; therefore , the temperature of the die is close to that of the printed circuit ground track. care should be taken to ensure that this is in good thermal contact with the measured surface. as in any ic, the adt7301 and its associated wiring and circuits must be kept free from moisture to prevent leakage and corrosion, particularly in cold conditions where condensation is more likely to occur. water-resistant varnishes and conformal coatings can be used for protection. the small size of the adt7301 allows it to be mounted inside sealed metal probes, which provide a safe environment for the device. supply decoupling the adt7301 should be decoupled with a 0.1 f ceramic capacitor between v dd and gnd. this is particularly important if the adt7301 mount is remote from the power supply.
adt7301 rev. a | page 15 of 16 outline dimensions compliant to jedec standards mo-178-ab 121608-a 10 4 0 seating plane 1.90 bsc 0.95 bsc 0.60 bsc 65 123 4 3.00 2.90 2.80 3.00 2.80 2.60 1.70 1.60 1.50 1.30 1.15 0.90 0 .15 max 0 .05 min 1.45 max 0.95 min 0.20 max 0.08 min 0.50 max 0.30 min 0.55 0.45 0.35 pin 1 indicator figure 19. 6-lead small outline transistor package [sot-23] (rj-6) dimensions shown in millimeters compliant to jedec standards mo-187-aa 100709-b 6 0 0.80 0.55 0.40 4 8 1 5 0.65 bsc 0.40 0.25 1.10 max 3.20 3.00 2.80 coplanarity 0.10 0.23 0.09 3.20 3.00 2.80 5.15 4.90 4.65 pin 1 identifier 15 max 0.95 0.85 0.75 0.15 0.05 figure 20. 8-lead mini small outline package [msop] (rm-8) dimensions shown in millimeters ordering guide model 1 temperature range temperature accuracy 2 package description package option branding ADT7301ARTZ-500RL7 ?40c to +150c 1c 6-lead sot-23 rj-6 t1h adt7301artz-reel7 ?40c to +150c 1c 6-lead sot-23 rj-6 t1h adt7301armz ?40c to +150c 1c 8-lead msop rm-8 t1h adt7301armz-reel7 ?40c to +150c 1c 8-lead msop rm-8 t1h eval-adt7301ebz evaluation board 1 z = rohs compliant part. 2 temperature accuracy is over a 0c to 70c temperature range.
adt7301 rev. a | page 16 of 16 notes ?2005C2010 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d02884C0C3/10(a)

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