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INTEGRATED CIRCUITS
DATA SHEET
OM4085 Universal LCD driver for low multiplex rates
Product specification Supersedes data of 1996 Nov 14 File under Integrated Circuits, IC12 1997 Feb 25
Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
FEATURES * Single-chip LCD controller/driver * Selectable backplane drive configuration: static or 2, 3 or 4 backplane multiplexing * Selectable display bias configuration: static, 12 or 13 * Internal LCD bias generation with voltage-follower buffers * 24 segment drives: up to twelve 8-segment numeric characters; up to six 15-segment alphanumeric characters; or any graphics of up to 96 elements * 24 x 4-bit RAM for display data storage * Auto-incremented display data loading across device subaddress boundaries * Display memory bank switching in static and duplex drive modes * Versatile blinking modes * LCD and logic supplies may be separated * 2.0 to 6 V power supply range * Low power consumption * Power saving mode for extremely low power consumption in battery-operated and telephone applications * I2C-bus interface * TTL/CMOS compatible * Compatible with any 4-bit, 8-bit or 16-bit microprocessors/microcontrollers * May be cascaded for large LCD applications (up to 1536 segments possible) * Cascadable with the 40 segment LCD driver PCF8576C * Optimized pinning for single plane wiring in both single and multiple OM4085 applications * Space-saving 40 lead plastic very small outline package (VSO40; SOT158-1) * No external components required (even in multiple device applications) * Manufactured in silicon gate CMOS process. ORDERING INFORMATION PACKAGE TYPE NUMBER NAME OM4085T VSO40 DESCRIPTION plastic very small outline package; 40 leads GENERAL DESCRIPTION
OM4085
The OM4085 is a peripheral device which interfaces to almost any Liquid Crystal Display (LCD) having low multiplex rates. It generates the drive signals for any static or multiplexed LCD containing up to four backplanes and up to 24 segments and can easily be cascaded for larger LCD applications. The OM4085 is compatible with most microprocessors/microcontrollers and communicates via a two-line bidirectional I2C-bus. Communication overheads are minimized by a display RAM with auto-incremented addressing, by hardware subaddressing and by display memory switching (static and duplex drive modes).
VERSION SOT158-1
1997 Feb 25
2
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13 VDD 5 R 14 15 R LCD VOLTAGE SELECTOR R VLCD 12 LCD BIAS GENERATOR
BLOCK DIAGRAM
Philips Semiconductors
BP0 BP2 BP1 BP3 16
BACKPLANE OUTPUTS
handbook, full pagewidth
Universal LCD driver for low multiplex rates
S0 to S23
17 to 40 DISPLAY SEGMENT OUTPUTS
DISPLAY LATCH
SHIFT REGISTER
3
CLK SYNC 4 3 TIMING BLINKER OSC 6 OSCILLATOR POWERON RESET VSS SCL SDA 11 2 1 INPUT FILTERS I2 C-BUS CONTROLLER 10 SA0
OM4085
INPUT BANK SELECTOR DISPLAY CONTROLLER DATA POINTER COMMAND DECODER SUBADDRESS COUNTER 7 A0 8 A1 9 DISPLAY RAM 24 x 4 BITS OUTPUT BANK SELECTOR
Product specification
A2
MGD866
OM4085
Fig.1 Block diagram.
Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
PINNING SYMBOL SDA SCL SYNC CLK VDD OSC A0 A1 A2 SA0 VSS VLCD BP0 BP2 BP1 BP3 PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 LCD backplane outputs I2C-bus slave address bit 0 input logic ground LCD supply voltage
VSS 11 VLCD 12 BP0 13 BP2 14 BP1 15 BP3 16 S0 17 S1 18 S2 19 S3 20
MGD865
OM4085
DESCRIPTION I2C-bus data input/output
handbook, halfpage
I2C-bus clock input/output cascade synchronization input/output external clock input/output positive supply voltage oscillator input I2C-bus subaddress inputs
SDA SCL SYNC CLK VDD OSC A0 A1 A2
1 2 3 4 5 6 7 8 9
40 S23 39 S22 38 S21 37 S20 36 S19 35 S18 34 S17 33 S16 32 S15 31 S14
SA0 10
OM4085
30 S13 29 S12 28 S11 27 S10 26 S9 25 S8 24 S7 23 S6 22 S5 21 S4
S0 to S23 17 to 40 LCD segment outputs
Fig.2 Pin configuration.
1997 Feb 25
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
FUNCTIONAL DESCRIPTION The OM4085 is a versatile peripheral device designed to interface any microprocessor to a wide variety of LCDs. It can directly drive any static or multiplexed LCD containing up to 4 backplanes and up to 24 segments. The display configurations possible with the OM4085 depend on the number of active backplane outputs required; a selection of display configurations is given in Table 1.
OM4085
All of the display configurations given in Table 1 can be implemented in the typical system shown in Fig.3. The host microprocessor/microcontroller maintains the two-line I2C-bus communication channel with the OM4085. The internal oscillator is selected by tying OSC (pin 6) to VSS. The appropriate biasing voltages for the multiplexed LCD waveforms are generated internally. The only other connections required to complete the system are to the power supplies (VDD, VSS and VLCD) and to the LCD panel chosen for the application.
Table 1
Selection of display configurations NUMBER OF SEGMENTS 96 72 48 24 7-SEGMENT NUMERIC 12 digits + 12 indicator symbols 9 digits + 9 indicator symbols 6 digits + 6 indicator symbols 3 digits + 3 indicator symbols 14-SEGMENT ALPHANUMERIC 6 characters + 12 indicator symbols 4 characters + 16 indicator symbols 3 characters + 6 indicator symbols 1 character + 10 indicator symbols DOT MATRIX 96 dots (4 x 24) 72 dots (3 x 24) 48 dots (2 x 24) 24 dots
ACTIVE BACKPLANE OUTPUTS 4 3 2 1
handbook, full pagewidth VDD
R
trise 2 Cbus SDA SCL OSC 5 1 2 6 7 A0
VDD
VLCD 12 17 to 40 24 segment drives LCD PANEL (up to 96 elements)
HOST MICROPROCESSOR/ MICROCONTROLLER
OM4085 13 to 16 8 A1 9 A2 10 11 SA0 VSS
4 backplanes
MBH951
VSS
Fig.3 Typical system configuration.
1997 Feb 25
5
Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
Power-on reset At power-on the OM4085 resets to a defined starting condition as follows: 1. All backplane outputs are set to VDD 2. All segment outputs are set to VDD 3. The drive mode `1 : 4 multiplex with 13bias' is selected 4. Blinking is switched off 5. Input and output bank selectors are reset (as defined in Table 5) 6. The I2C-bus interface is initialized 7. The data pointer and the subaddress counter are cleared. Data transfers on the I2C-bus should be avoided for 1 ms following power-on to allow completion of the reset action. LCD bias generator The full-scale LCD voltage (Vop) is obtained from VDD - VLCD. The LCD voltage may be temperature compensated externally through the VLCD supply to pin 12. Fractional LCD biasing voltages are obtained from an internal voltage divider of three series resistors connected between VDD and VLCD. The centre resistor can be switched out of circuit to provide a 12bias voltage level for the 1 : 2 multiplex configuration. LCD voltage selector
OM4085
The LCD voltage selector coordinates the multiplexing of the LCD according to the selected LCD drive configuration. The operation of the voltage selector is controlled by MODE SET commands from the command decoder. The biasing configurations that apply to the preferred modes of operation, together with the biasing characteristics as functions of Vop = VDD - VLCD and the resulting discrimination ratios (D), are given in Table 2. A practical value of Vop is determined by equating Voff(rms) with a defined LCD threshold voltage (Vth), typically when the LCD exhibits approximately 10% contrast. In the static drive mode a suitable choice is Vop 3 Vth. Multiplex drive ratios of 1 : 3 and 1 : 4 with 12 bias are possible but the discrimination and hence the contrast ratios are smaller ( 3 = 1.732 for 1 : 3 multiplex or 21 3 = 1.528 for 1 : 4 multiplex). The advantage of these modes is a reduction of the LCD full scale voltage Vop as follows: 1 : 3 multiplex (12bias): V op = 6V op(mrs) = 2.449V off ( rms )
1 : 4 multiplex (12bias): V op =
4
3 3 V off ( rms ) = 2.309V off ( rms )
These compare with Vop = 3 Voff(rms) when 13bias is used. Table 2 Preferred LCD drive modes: summary of characteristics LCD BIAS CONFIGURATION static (2 levels)
1 1 1 1 2 3 3 3
LCD DRIVE MODE Static (1 BP) 1 : 2 MUX (2 BP) 1 : 2 MUX (2 BP) 1 : 3 MUX (3 BP) 1 : 4 MUX (4 BP)
V off ( rms ) ---------------------V op 0 2 4 = 0.354
1 1 1 3 3 3
V on ( rms ) ---------------------V op 1 10 4 = 0.791 5 3 = 0.745 33 9 = 0.638 3 3 = 0.577
V on ( rms ) D = ---------------------V off ( rms ) 5 = 2.236 5 = 2.236 33 3 = 1.915 3 = 1.732
(3 levels) (4 levels) (4 levels) (4 levels)
= 0.333 = 0.333 = 0.333
1997 Feb 25
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
LCD drive mode waveforms
OM4085
The static LCD drive mode is used when a single backplane is provided in the LCD. Backplane and segment drive waveforms for this mode are shown in Fig.4. When two backplanes are provided in the LCD the 1 : 2 multiplex drive mode applies. The OM4085 allows use of 1 or 1 bias in this mode as shown in Figs 5 and 6. 2 3 The backplane and segment drive waveforms for the 1 : 3 multiplex drive mode (three LCD backplanes) and for the 1 : 4 multiplex drive mode (four LCD backplanes) are shown in Figs 7 and 8 respectively.
handbook, full pagewidth
Tframe VDD BP0 VLCD VDD Sn VLCD VDD Sn + 1 VLCD (a) waveforms at driver Vop state 1 (on) state 2 (off) LCD segments
state 1
0
-Vop Vop
At any instant (t): Vstate 1(t) = VS (t) - VBP0(t) n Von(rms) = Vop
state 2
0
Vstate 2(t) = VSn + 1(t) - VBP0(t) Voff(rms) = 0 V
-Vop
(b) resultant waveforms at LCD segment
MGG392
Fig.4 Static drive mode waveforms: Vop = VDD - VLCD.
1997 Feb 25
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
OM4085
handbook, full pagewidth
Tframe VDD BP0 (VDD + VLCD)/2 VLCD VDD BP1 (VDD + VLCD)/2 VLCD VDD Sn VLCD VDD Sn + 1 VLCD (a) waveforms at driver Vop Vop/2 state 1 0 -Vop/2 -Vop Vop Vop/2 state 2 0 -Vop/2 -Vop (b) resultant waveforms at LCD segment
MGG394
LCD segments
state 1 state 2
At any instant (t): Vstate 1(t) = VSn(t) - VBP0(t) V Von(rms) = op10 = 0.791Vop 4 Vstate 2(t) = VS (t) - VBP1(t) n V Voff(rms) = op2 = 0.354Vop 4
Fig.5 Waveforms for 1 : 2 multiplex drive mode with 12 bias: Vop = VDD - VLCD.
1997 Feb 25
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
OM4085
handbook, full pagewidth
Tframe VDD BP0 VDD - Vop/3 VDD - 2Vop/3 VLCD VDD BP1 VDD - Vop/3 VDD - 2Vop/3 VLCD VDD VDD - Vop/3 VDD - 2Vop/3 VLCD VDD VDD - Vop/3 VDD - 2Vop/3 VLCD (a) waveforms at driver Vop 2Vop/3 Vop/3 0 -Vop/3 -2Vop/3 -Vop Vop 2Vop/3 Vop/3 0 -Vop/3 -2Vop/3 -Vop LCD segments
state 1 state 2
Sn
Sn + 1
state 1
At any instant (t): Vstate 1(t) = VSn(t) - VBP0(t) V Von(rms) = op5 = 0.745Vop 3 Vstate 2(t) = VS (t) - VBP1(t) n V Voff(rms) = op = 0.333Vop 3
state 2
(b) resultant waveforms at LCD segment
MGG393
Fig.6 Waveforms for 1 : 2 multiplex drive mode with 13 bias: Vop = VDD - VLCD.
1997 Feb 25
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
OM4085
handbook, full pagewidth
Tframe VDD VDD - Vop/3 VDD - 2Vop/3 VLCD VDD VDD - Vop/3 VDD - 2Vop/3 VLCD VDD VDD - Vop/3 VDD - 2Vop/3 VLCD VDD VDD - Vop/3 VDD - 2Vop/3 VLCD VDD VDD - Vop/3 VDD - 2Vop/3 VLCD VDD VDD - Vop/3 VDD - 2Vop/3 VLCD (a) waveforms at driver Vop 2Vop/3 Vop/3 state 1 0 -Vop/3 -2Vop/3 -Vop Vop 2Vop/3 Vop/3 state 2 0 -Vop/3 -2Vop/3 -Vop LCD segments
BP0
state 1 state 2
BP1
BP2
Sn
Sn + 1
Sn + 2
At any instant (t): Vstate 1(t) = VS (t) - VBP0(t) n V Von(rms) = op33 = 0.638Vop 9 Vstate 2(t) = VSn(t) - VBP1(t) V Voff(rms) = op = 0.333Vop 3
(b) resultant waveforms at LCD segment
MGG395
Fig.7 Waveforms for 1 : 3 multiplex drive mode: Vop = VDD - VLCD.
1997 Feb 25
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
OM4085
handbook, full pagewidth
Tframe VDD VDD - Vop/3 VDD - 2Vop/3 VLCD VDD VDD - Vop/3 VDD - 2Vop/3 VLCD VDD VDD - Vop/3 VDD - 2Vop/3 VLCD VDD VDD - Vop/3 VDD - 2Vop/3 VLCD VDD VDD - Vop/3 VDD - 2Vop/3 VLCD VDD - Vop/3 VDD - 2Vop/3 VLCD VDD - Vop/3 VDD - 2Vop/3 VLCD VDD VDD - Vop/3 VDD - 2Vop/3 VLCD (a) waveforms at driver Vop 2Vop/3 Vop/3 0 -Vop/3 -2Vop/3 -Vop Vop 2Vop/3 Vop/3 0 -Vop/3 -2Vop/3 -Vop VDD VDD LCD segments
BP0
state 1 state 2
BP1
BP2
BP3
Sn
Sn + 1
Sn + 2
Sn + 3
state 1
At any instant (t): Vstate 1(t) = VSn(t) - VBP0(t) V Von(rms) = op3 = 0.577Vop 3 Vstate 2(t) = VS (t) - VBP1(t) n V Voff(rms) = op = 0.333Vop 3
state 2
(b) resultant waveforms at LCD segment
MGG396
Fig.8 Waveforms for 1 : 4 multiplex drive mode: Vop = VDD - VLCD.
1997 Feb 25
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
Oscillator The internal logic and the LCD drive signals of the OM4085 or PCF8576 are timed either by the built-in oscillator or from an external clock. The clock frequency (fCLK) determines the LCD frame frequency and the maximum rate for data reception from the I2C-bus. To allow I2C-bus transmissions at their maximum data rate of 100 kHz, fCLK should be chosen to be above 125 kHz. A clock signal must always be supplied to the device; removing the clock may freeze the LCD in a DC state. Internal clock When the internal oscillator is used, OSC (pin 6) should be tied to VSS. In this case, the output from CLK (pin 4) provides the clock signal for cascaded OM4085s and PCF8576s in the system. External clock The condition for external clock is made by tying OSC (pin 6) to VDD; CLK (pin 4) then becomes the external clock input. Timing The timing of the OM4085 organizes the internal data flow of the device. This includes the transfer of display data from the display RAM to the display segment outputs. In cascaded applications, the synchronization signal SYNC maintains the correct timing relationship between the OM4085s in the system. The timing also generates the LCD frame frequency which it derives as an integer multiple of the clock frequency (Table 3). The frame frequency is set by MODE SET commands when internal clock is used, or by the frequency applied to pin 4 when external clock is used. Table 3 LCD frame frequencies fframe fCLK/2880 fCLK/480 NOMINAL fframe (Hz) 64 64 Segment outputs
OM4085
The lower clock frequency has the disadvantage of increasing the response time when large amounts of display data are transmitted on the I2C-bus. When a device is unable to `digest' a display data byte before the next one arrives, it holds the SCL line LOW until the first display data byte is stored. This slows down the transmission rate of the I2C-bus but no data loss occurs. Display latch The display latch holds the display data while the corresponding multiplex signals are generated. There is a one-to-one relationship between the data in the display latch, the LCD segment outputs and one column of the display RAM. Shift register The shift register serves to transfer display information from the display RAM to the display latch while previous data are displayed.
The LCD drive section includes 24 segment outputs S0 to S23 (pins 17 to 40) which should be connected directly to the LCD. The segment output signals are generated in accordance with the multiplexed backplane signals and with the data resident in the display latch. When less than 24 segment outputs are required the unused segment outputs should be left open-circuit. Backplane outputs The LCD drive section includes four backplane outputs BP0 to BP3 which should be connected directly to the LCD. The backplane output signals are generated in accordance with the selected LCD drive mode. If less than four backplane outputs are required the unused outputs can be left open. In the 1 : 3 multiplex drive mode BP3 carries the same signal as BP1, therefore these two adjacent outputs can be tied together to give enhanced drive capabilities. In the 1 : 2 multiplex drive mode BP0 and BP2, BP1 and BP3 respectively carry the same signals and may also be paired to increase the drive capabilities. In the static drive mode the same signal is carried by all four backplane outputs and they can be connected in parallel for very high drive requirements. Display RAM The display RAM is a static 24 x 4-bit RAM which stores LCD data. A logic 1 in the RAM bit-map indicates the `on' state of the corresponding LCD segment; similarly, a logic 0 indicates the `off' state. 12
OM4085 MODE Normal mode Power saving mode
The ratio between the clock frequency and the LCD frame frequency depends on the mode in which the device is operating. In the power saving mode the reduction ratio is six times smaller; this allows the clock frequency to be reduced by a factor of six. The reduced clock frequency results in a significant reduction in power dissipation. 1997 Feb 25
Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
There is a one-to-one correspondence between the RAM addresses and the segment outputs, and between the individual bits of a RAM word and the backplane outputs. The first RAM column corresponds to the 24 segments operated with respect to backplane BP0 (see Fig.9). In multiplexed LCD applications the segment data of the second, third and fourth column of the display RAM are time-multiplexed with BP1, BP2 and BP3 respectively. When display data are transmitted to the OM4085 the display bytes received are stored in the display RAM according to the selected LCD drive mode. To illustrate the filling order, an example of a 7-segment numeric display showing all drive modes is given in Fig.10; the RAM filling organization depicted applies equally to other LCD types. With reference to Fig.10, in the static drive mode the eight transmitted data bits are placed in bit 0 of eight successive display RAM addresses. In the 1 : 2 multiplex drive mode the eight transmitted data bits are placed in bits 0 and 1 of four successive display RAM addresses. In the 1 : 3 multiplex drive mode these bits are placed in bits 0, 1 and 2 of three successive addresses, with bit 2 of the third address left unchanged. This last bit may, if necessary, be controlled by an additional transfer to this address but care should be taken to avoid overriding adjacent data because full bytes are always transmitted. In the 1 : 4 multiplex drive mode the eight transmitted data bits are placed in bits 0, 1, 2 and 3 of two successive display RAM addresses. Data pointer The addressing mechanism for the display RAM is realized using the data pointer. This allows the loading of an individual display data byte, or a series of display data bytes, into any location of the display RAM.
OM4085
The sequence commences with the initialization of the data pointer by the LOAD DATA POINTER command. Following this, an arriving data byte is stored starting at the display RAM address indicated by the data pointer thereby observing the filling order shown in Fig.10. The data pointer is automatically incremented according to the LCD configuration chosen. That is, after each byte is stored, the contents of the data pointer are incremented by eight (static drive mode), by four (1 : 2 multiplex drive mode), by three (1 : 3 multiplex drive mode) or by two (1 : 4 multiplex drive mode). Subaddress counter The storage of display data is conditioned by the contents of the subaddress counter. Storage is allowed to take place only when the contents of the subaddress counter agree with the hardware subaddress applied to A0, A1 and A2 (pins 7, 8, and 9). A0, A1 and A2 should be tied to VSS or VDD. The subaddress counter value is defined by the DEVICE SELECT command. If the contents of the subaddress counter and the hardware subaddress do not agree then data storage is inhibited but the data pointer is incremented as if data storage had taken place. The subaddress counter is also incremented when the data pointer overflows. The storage arrangements described lead to extremely efficient data loading in cascaded applications. When a series of display bytes are being sent to the display RAM, automatic wrap-over to the next OM4085 occurs when the last RAM address is exceeded. Subaddressing across device boundaries is successful even if the change to the next device in the cascade occurs within a transmitted character.
handbook, full pagewidth
display RAM addresses (rows)/segment outputs (S) 0 0 display RAM bits 1 (columns) / backplane outputs 2 (BP) 3
MGG389
1
2
3
4
19
20
21
22
23
Fig.9
Display RAM bit-map showing direct relationship between display RAM addresses and segment outputs, and between bits in a RAM word and backplane outputs.
1997 Feb 25
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drive mode LCD segments
a f g e d Sn 6 c b Sn Sn Sn 7 DP 1 BP0
Philips Semiconductors
Universal LCD driver for low multiplex rates
LCD backplanes
display RAM filling order
transmitted display byte
Sn Sn Sn
2 3 4 5
n bit/ BP 0 1 2 3 c x x x
n1 b x x x
n2 a x x x
n3 f x x x
n4 g x x x
n5 e x x x
n6 d x x x
n7 MSB DP x x x cbaf LSB g e d DP
static
Sn
Sn
BP0 a f g b
n bit/ BP
BP1 c
n1 f g x x
n2 e c x x
n3 d DP x x MSB abf LSB g e c d DP
1:2
Sn
1
multiplex
Sn Sn Sn
2 3
e d
DP
0 1 2 3
a b x x
handbook, full pagewidth
14
1:3 multiplex 1:4 multiplex
1 2 f
a b g e d c DP Sn
BP0
n bit/ BP
BP1 BP2
n1 a d g x
n2 f e x x MSB b DP c a d g f LSB e
Sn
0 1 2 3
b DP c x
Sn f
a b g e c d DP BP1 BP3 BP0 BP2
n bit/ BP 0 1 2 3 a c b DP
n1 f e g d
MSB a c b DP f
LSB egd
Sn
1
Product specification
MBE534
OM4085
Fig.10 Relationships between LCD layout, drive mode, display RAM filling order and display data transmitted over the I2C-bus (X = data bit unchanged).
Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
Output bank selector This selects one of the four bits per display RAM address for transfer to the display latch. The actual bit chosen depends on the particular LCD drive mode in operation and on the instant in the multiplex sequence. In 1 : 4 multiplex, all RAM addresses of bit 0 are the first to be selected, these are followed by the contents of bit 1, bit 2 and then bit 3. Similarly in 1 : 3 multiplex, bits 0, 1 and 2 are selected sequentially. In 1 : 2 multiplex, bits 0 then 1 are selected and, in the static mode, bit 0 is selected. The OM4085 includes a RAM bank switching feature in the static and 1 : 2 multiplex drive modes. In the static drive mode, the BANK SELECT command may request the contents of bit 2 to be selected for display instead of bit 0 contents. In the 1 : 2 drive mode, the contents of bits 2 and 3 may be selected instead of bits 0 and 1. This gives the provision for preparing display information in an alternative bank and to be able to switch to it once it is assembled. Input bank selector The input bank selector loads display data into the display RAM according to the selected LCD drive configuration. Display data can be loaded in bit 2 in static drive mode or in bits 2 and 3 in 1 : 2 drive mode by using the BANK SELECT command. The input bank selector functions independently of the output bank selector. Table 4 Blinking frequencies NORMAL OPERATING MODE RATIO - fCLK/92160 fCLK/184320 fCLK/368640 POWER-SAVING MODE RATIO - fCLK/15360 fCLK/30720 fCLK/61440 Blinker
OM4085
The display blinking capabilities of the OM4085 are very versatile. The whole display can be blinked at frequencies selected by the BLINK command. The blinking frequencies are integer multiples of the clock frequency; the ratios between the clock and blinking frequencies depend on the mode in which the device is operating, as shown in Table 4. An additional feature is for an arbitrary selection of LCD segments to be blinked. This applies to the static and 1 : 2 LCD drive modes and can be implemented without any communication overheads. By means of the output bank selector, the displayed RAM banks are exchanged with alternate RAM banks at the blinking frequency. This mode can also be specified by the BLINK command. In the 1 : 3 and 1 : 4 multiplex modes, where no alternate RAM bank is available, groups of LCD segments can be blinked by selectively changing the display RAM data at fixed time intervals. If the entire display is to be blinked at a frequency other than the nominal blinking frequency, this can be effectively performed by resetting and setting the display enable bit E at the required rate using the MODE SET command.
BLINKING MODE Off 2 Hz 1 Hz 0.5 Hz
NOMINAL BLINKING FREQUENCY fblink (Hz) blinking off 2 1 0.5
1997 Feb 25
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
I2C-BUS DESCRIPTION The I2C-bus is for 2-way, 2-line communication between different ICs or modules. The two lines are a serial data line (SDA) and a serial clock line (SCL). Both lines must be connected to a positive supply via a pull-up resistor when connected to the output stages of a device. Data transfer may be initiated only when the bus is not busy. Bit transfer One data bit is transferred during each clock pulse. The data on the SDA line must remain stable during the HIGH period of the clock pulse as changes in the data line at this time will be interpreted as control signals. Start and stop conditions Both data and clock lines remain HIGH when the bus is not busy. A HIGH-to-LOW transition of the data line while the clock is HIGH is defined as the START condition (S). A LOW-to-HIGH transition of the data line while the clock is HIGH is defined as the STOP condition (P). System configuration A device generating a message is a `transmitter', a device receiving a message is a `receiver'. The device that controls the message is the `master' and the devices which are controlled by the master are the `slaves'. Acknowledge
OM4085
The number of data bytes transferred between the START and STOP conditions from transmitter to receiver is not limited. Each byte is followed by one acknowledge bit. The acknowledge bit is a HIGH level put on the bus by the transmitter whereas the master generates an extra acknowledge related clock pulse. A slave receiver which is addressed must generate an acknowledge after the reception of each byte. Also a master must generate an acknowledge after the reception of each byte that has been clocked out of the slave transmitter. The device that acknowledges has to pull down the SDA line during the acknowledge clock pulse, so that the SDA line is stable LOW during the HIGH period of the acknowledge related clock pulse, set up and hold times must be taken into account. A master receiver must signal an end of data to the transmitter by not generating an acknowledge on the last byte that has been clocked out of the slave. In this event the transmitter must leave the data line HIGH to enable the master to generate a STOP condition.
SDA
SCL data line stable; data valid change of data allowed
MBA607
Fig.11 Bit transfer.
1997 Feb 25
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
OM4085
SDA
SDA
SCL S START condition P STOP condition
SCL
MBA608
Fig.12 Definition of START and STOP conditions.
SDA SCL MASTER TRANSMITTER / RECEIVER SLAVE TRANSMITTER / RECEIVER MASTER TRANSMITTER / RECEIVER
MBA605
SLAVE RECEIVER
MASTER TRANSMITTER
Fig.13 System configuration.
handbook, full pagewidth
START condition SCL FROM MASTER 1 2 8
clock pulse for acknowledgement 9
DATA OUTPUT BY TRANSMITTER S DATA OUTPUT BY RECEIVER
MBA606 - 1
Fig.14 Acknowledgement on the I2C-bus.
1997 Feb 25
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
OM4085 I2C-bus controller The OM4085 acts as an I2C-bus slave receiver. It does not initiate I2C-bus transfers or transmit data to an I2C-bus master receiver. The only data output from the OM4085 are the acknowledge signals of the selected devices. Device selection depends on the I2C-bus slave address, on the transferred command data and on the hardware subaddress. In single device applications, the hardware subaddress inputs A0, A1 and A2 are normally left open-circuit or tied to VSS which defines the hardware subaddress 0. In multiple device applications A0, A1 and A2 are left open-circuit or tied to VSS or VDD according to a binary coding scheme such that no two devices with a common I2C-bus slave address have the same hardware subaddress. In the power-saving mode it is possible that the OM4085 is not able to keep up with the highest transmission rates when large amounts of display data are transmitted. If this situation occurs, the OM4085 forces the SCL line LOW until its internal operations are completed. This is known as the `clock synchronization feature' of the I2C-bus and serves to slow down fast transmitters. Data loss does not occur. Input filters To enhance noise immunity in electrically adverse environments, RC low-pass filters are provided on the SDA and SCL lines. I2C-bus protocol Two I2C-bus slave addresses (0111110 and 0111111) are reserved for OM4085. The least-significant bit of the slave address that a OM4085 will respond to is defined by the level tied at its input SA0 (pin 10). Therefore, two types of OM4085 can be distinguished on the same I2C-bus which allows: 1. Up to 16 OM4085s on the same I2C-bus for very large LCD applications 2. The use of two types of LCD multiplex on the same I2C-bus.
OM4085
The I2C-bus protocol is shown in Fig.15. The sequence is initiated with a START condition (S) from the I2C-bus master which is followed by one of the two OM4085 slave addresses available. All OM4085s with the corresponding SA0 level acknowledge in parallel the slave address but all OM4085s with the alternative SA0 level ignore the whole I2C-bus transfer. After acknowledgement, one or more command bytes (m) follow which define the status of the addressed OM4085s. The last command byte is tagged with a cleared most-significant bit, the continuation bit C. The command bytes are also acknowledged by all addressed OM4085s on the bus. After the last command byte, a series of display data bytes (n) may follow. These display data bytes are stored in the display RAM at the address specified by the data pointer and the subaddress counter. Both data pointer and subaddress counter are automatically updated and the data are directed to the intended OM4085 device. The acknowledgement after each byte is made only by the (A0, A1, A2) addressed OM4085. After the last display byte, the I2C-bus master issues a STOP condition (P). Command decoder The command decoder identifies command bytes that arrive on the I2C-bus. All available commands carry a continuation bit C in their most-significant bit position (see Fig.16). When this bit is set, it indicates that the next byte of the transfer to arrive will also represent a command. If the bit is reset, it indicates the last command byte of the transfer. Further bytes will be regarded as display data. The five commands available to the OM4085 are defined in Table 5.
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
OM4085
handbook, full pagewidth
R/ W slave address S
acknowledge by all addressed OM4085s
acknowledge by A0, A1 and A2 selected OM4085 only
S 0 1 1 1 1 1A 0AC
0 1 byte
COMMAND
A
DISPLAY DATA
A
P
m 1 byte(s)
n 0 byte(s) update data pointers and if necessary, subaddress counter
MBH953
Fig.15 I2C-bus protocol.
0 = last command 1 = commands continue MSB C REST OF OPCODE
MGG388
LSB
Fig.16 General format of command byte.
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
Table 5 Definition of OM4085 commands COMMAND/OPCODE Mode set C 1 0 LP E B M1 M0 see Table 6 see Table 7 see Table 8 defines LCD drive mode defines LCD bias configuration OPTIONS DESCRIPTION
OM4085
defines display status; the possibility to disable the display allows implementation of blinking under external control defines power dissipation mode
see Table 9 Load data pointer C 0 0 P4 P3 P2 P1 P0 see Table 10
five bits of immediate data, bits P4 to P0, are transferred to the data pointer to define one of twenty-four display RAM addresses
Device select C 1 1 0 0 A2 A1 A0 see Table 11 three bits of immediate data, bits A0 to A2, are transferred to the subaddress counter to define one of eight hardware subaddresses
Bank select C 1 1 1 1 0 I O see Table 12 see Table 13 defines input bank selection (storage of arriving display data) defines output bank selection (retrieval of LCD display data) the BANK SELECT command has no effect in 1 : 3 and 1 : 4 multiplex drive modes Blink C 1 1 1 0 A BF1 BF0 see Table 14 see Table 15 defines the blinking frequency selects the blinking mode; normal operation with frequency set by bits BF1 and BF0, or blinking by alternation of display RAM banks. Alternation blinking does not apply in 1 : 3 and 1 : 4 multiplex drive modes
Table 6
LCD drive mode LCD DRIVE MODE BIT M1 0 1 1 0 BIT M0 1 0 1 0
Static (1 BP) 1 : 2 MUX (2 BP) 1 : 3 MUX (3 BP) 1 : 4 MUX (4 BP)
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
Table 7
1 1
OM4085
Table 15 Blink mode selection
LCD bias configuration LCD BIAS BIT B 0 1 Display status BIT E 0 1 Power dissipation mode MODE BIT LP 0 1
BLINK MODE Normal blinking Alternation blinking Display controller
BIT A 0 1
3bias 2bias
Table 8
DISPLAY STATUS Disabled (blank) Enabled Table 9
The display controller executes the commands identified by the command decoder. It contains the status registers of the OM4085 and coordinates their effects. The controller is also responsible for loading display data into the display RAM as required by the filling order. Cascaded operation In large display configurations, up to 16 OM4085s can be distinguished on the same I2C-bus by using the 3-bit hardware subaddress (A0, A1 and A2) and the programmable I2C-bus slave address (SA0). It is also possible to cascade up to 16 OM4085s. When cascaded, several OM4085s are synchronized so that they can share the backplane signals from one of the devices in the cascade. Such an arrangement is cost-effective in large LCD applications since the outputs of only one device need to be through-plated to the backplane electrodes of the display. The other OM4085s of the cascade contribute additional segment outputs but their backplane outputs are left open-circuit (Fig.17). The SYNC line is provided to maintain the correct synchronization between all cascaded OM4085s. This synchronization is guaranteed after the power-on reset. The only time that SYNC is likely to be needed is if synchronization is accidentally lost (e.g. by noise in adverse electrical environments; or by the definition of a multiplex mode when OM4085s with differing SA0 levels are cascaded). SYNC is organized as an input/output pin; the output section being realized as an open-drain driver with an internal pull-up resistor. A OM4085 asserts the SYNC line at the onset of its last active backplane signal and monitors the SYNC line at all other times. Should synchronization in the cascade be lost, it will be restored by the first OM4085 to assert SYNC. The timing relationships between the backplane waveforms and the SYNC signal for the various drive modes of the PCF8576 are shown in Fig.18. The waveforms are identical with the parent device PCF8576. Cascade ability between OM4085s and PCF8576s is possible, giving cost effective LCD applications.
Normal mode Power-saving mode Table 10 Load data pointer BITS P4 P3 P2
P1
P0
5-bit binary value of 0 to 23 Table 11 Device select BITS A0 A1 A2
3-bit binary value of 0 to 7 Table 12 Input bank selection STATIC RAM bit 0 RAM bit 2 1 : 2 MUX RAM bits 0, 1 RAM bits 2, 3 BIT 1 0 1
Table 13 Output bank selection STATIC RAM bit 0 RAM bit 2 1 : 2 MUX RAM bits 0, 1 RAM bits 2, 3 BIT 0 0 1
Table 14 Blinking frequency BLINK FREQUENCY Off 2 Hz 1 Hz 0.5 Hz BIT BF1 0 0 1 1 BIT BF0 0 1 0 1
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
OM4085
handbook, full pagewidth
VDD 5 SDA 1 SCL 2 SYNC CLK 3
VLCD 12 17 to 40
24 segment drives
OM4085 13 to 16 8 A0 A1 9 A2 10 11 BP0 to BP3 (open-circuit)
LCD PANEL (up to 1536 elements)
4 OSC 6 7
SA0 VSS
VLCD VDD R
trise 2 Cbus 5 SDA SCL SYNC CLK OSC 1 2 3 4 6 7 A0
VDD
VLCD 12 17 to 40 24 segment drives
HOST MICROPROCESSOR/ MICROCONTROLLER
OM4085 13 to 16 8 A1 9 A2 10 11
4 backplanes
BP0 to BP3
MBH950
SA0 VSS
VSS
Fig.17 Cascaded OM4085 configuration.
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
OM4085
handbook, full pagewidth
1 Tframe = f frame
BP0
SYNC (a) static drive mode. BP1 (1/2 bias)
BP1 (1/3 bias)
SYNC (b) 1 : 2 multiplex drive mode.
BP2
SYNC (c) 1 : 3 multiplex drive mode.
BP3
SYNC
MBE535
(d) 1 : 4 multiplex drive mode.
Fig.18 Synchronization of the cascade for the various OM4085 drive modes.
For single plane wiring of OM4085s, see Chapter "Application information".
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL VDD VLCD VI VO II IO Ptot PO Tstg HANDLING supply voltage LCD supply voltage input voltage (SCL, SDA, A0 to A2, OSC, CLK, SYNC and SA0) output voltage (S0 to S23 and BP0 to BP3) DC input current DC output current power dissipation per package power dissipation per output storage temperature PARAMETER MIN. -0.5 VDD - 7 VSS - 0.5 VLCD - 0.5 - - - - - -65 +7 VDD MAX.
OM4085
UNIT V V V V mA mA mA mW mW C
VDD + 0.5 VDD + 0.5 20 25 50 400 100 +150
IDD, ISS, ILCD VDD, VSS or VLCD current
Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is advised to take handling precautions appropriate to handling MOS devices (see "Handling MOS devices").
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
OM4085
DC CHARACTERISTICS VSS = 0 V; VDD = 2.0 to 6 V; VLCD = VDD - 2.0 to VDD - 6 V; Tamb = -40 to +85 C; unless otherwise specified. SYMBOL Supplies VDD VLCD IDD ILP operating supply voltage LCD supply voltage operating supply current (normal mode) power saving mode supply current fCLK = 200 kHz; note 1 VDD = 3.5 V; VLCD = 0 V; fCLK = 35 kHz; A0, A1 and A2 tied to VSS; note 1 2.0 VDD - 6 - - - - 30 15 6 90 40 V A A VDD - 2.0 V PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
Logic VIL VIH VOL VOH IOL1 IOH IOL2 ILI LOW level input voltage HIGH level input voltage LOW level output voltage HIGH level output voltage LOW level output current (CLK and SYNC) HIGH level output current (CLK) LOW level output current (SDA and SCL) leakage current (SA0, CLK, OSC, A0, A1, A2, SCL and SDA) pull-down current (A0, A1, A2 and OSC) pull-up resistor (SYNC) power-on reset level tolerable spike width on bus input capacitance note 3 note 2 IO = 0 mA IO = 0 mA VOL = 1 V; VDD = 5 V VOH = 4 V; VDD = 5 V VOL = 0.4 V; VDD = 5 V VI = VSS or VDD VSS 0.7VDD - 1 - 3 - - - - - - - - 0.3VDD VDD 0.05 - - -1 - 1 V V V V mA mA mA A
VDD - 0.05 -
Ipd RpuSYNC Vref tsw Ci VBP VS ZBP ZS Notes
VI = 1 V; VDD = 5 V
15 15 - - - - - -
50 25 1.3 - - 20 20 1 3
150 60 2 100 7 - - 5 7
A k V ns pF
LCD outputs DC voltage component (BP0 to BP3) DC voltage component (S0 to S23) output impedance (BP0 to BP3) output impedance (S0 to S23) CBP = 35 nF CS = 5 nF VLCD = VDD -5 V; note 4 mV mV k k
VLCD = VDD - 5 V; note 4 -
1. Outputs open; inputs at VSS or VDD; external clock with 50% duty factor; I2C-bus inactive. 2. Resets all logic when VDD < Vref. 3. Periodically sampled, not 100% tested. 4. Outputs measured one at a time.
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
OM4085
AC CHARACTERISTICS VSS = 0 V; VDD = 2.0 to 6 V; VLCD = VDD - 2.0 to VDD - 6 V; Tamb = -40 to +85 C; unless otherwise specified; note 1. SYMBOL fCLK fCLKLP tCLKH tCLKL tPSYNC tSYNCL tPLCD I2C-bus tBUF tHD; STA tLOW tHIGH tSU; STA tHD; DAT tSU; DAT tr tf tSU; STO Notes 1. All timing values referred to VIH and VIL levels with an input voltage swing of VSS to VDD. 2. At fCLK < 125 kHz, I2C-bus maximum transmission speed is derated. bus free time START condition hold time SCL LOW time SCL HIGH time START condition set-up time (repeated start code only) data hold time data set-up time rise time fall time STOP condition set-up time 4.7 4 4.7 4 4.7 0 250 - - 4.7 - - - - - - - - - - - - - - - - - 1 300 - s s s s s s ns s ns s PARAMETER oscillator frequency (normal mode) oscillator frequency (power saving mode) CLK HIGH time CLK LOW time SYNC propagation delay SYNC LOW time driver delays with test loads VLCD = VDD - 5 V CONDITIONS VDD = 5 V; note 2 VDD = 3.5 V 21 1 1 - 1 - MIN. 125 TYP. 200 31 - - - - - MAX. 315 48 - - 400 - 30 UNIT kHz kHz s s ns s s
handbook, full pagewidth
CLK (pin 4)
3.3 k (2%) 0.5VDD 6.8 k (2%)
SDA, SCL (pins 1, 2)
1.5 k (2%) VDD
SYNC (pin 3)
VDD
BP0 to BP3 (pins 13 to 16)
Iload 25 A
S0 to S23 (pins 17 to 40)
Iload 15 A
MGG387
Fig.19 Test loads.
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
OM4085
handbook, full pagewidth
1 fCLK tCLKH tCLKL 0.7VDD 0.3VDD
CLK
SYNC
0.7VDD 0.3VDD tPSYNC tSYNCL 0.5 V
BP0 to BP3 S0 to S23
(VDD = 5 V) 0.5 V tPLCD
MGG391
Fig.20 Driver timing waveforms.
handbook, full pagewidth
SDA
t BUF
t LOW
tf
SCL
t
HD;STA
tr
t HD;DAT
t HIGH
t SU;DAT
SDA t SU;STA
MGA728
t SU;STO
Fig.21 I2C-bus timing waveforms.
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
OM4085
handbook, halfpage
40
MGG397
handbook, halfpage
24
MGG398
IDD (A) 30 -40 C
IDD (A) 16
-40 C
+85 C 20
+85 C
8 10
0 0 2 4 6 VDD (V) 8
0 0 2 4 6 VDD (V) 8
a. Normal mode; VLCD = 0 V; external clock = 200 kHz.
b. Low power mode; VLCD = 0 V; external clock = 35 kHz.
Fig.22 Typical supply current characteristics.
handbook, halfpage
6
MGG399
MGG400
handbook, halfpage
12
RBP (k) 4
RS (k) 8 -40 C
2
4
+25 C +85 C
0 0 2 4 6 VDD (V) 8
0 0 2 4 6 VDD (V) 8
a. Backplane output impedance BP0 to BP3 (RBP); VDD = 5 V; Tamb = -40 to +85 C.
b. Segment output impedance S0 to S23 (RS); VDD = 5 V.
Fig.23 Typical characteristics of LCD outputs.
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handbook, full pagewidth
APPLICATION INFORMATION
Philips Semiconductors
Universal LCD driver for low multiplex rates
SDA SCL SYNC CLK VDD VSS VLCD SDA SCL SYNC CLK VDD OSC A0 A1 A2 SA0 VSS VLCD BP0 BP2 BP1 BP3 S0 S1 S2 S3 S0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28
S23 S22 S21 S20 S19 S18 S17 S16 S15 S14 S13 S12 S11 S10 S9 S8 S7 S6 S5 S4 S23 SEGMENTS S24 open-circuit BP0 BP2 BP1 BP3 S24 S25 S26 S27
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
40 39 38 37 36 35 34 33 32 31 30 29 28
S47 S46 S45 S44 S43 S42 S41 S40 S39 S38 S37 S36 S35 S34 S33 S32 S31 S30 S29 S28 S47
MBH952
29
BACKPLANES
OM4085
27 26 25 24 23 22 21
OM4085
27 26 25 24 23 22 21
Product specification
OM4085
Fig.24 Single plane wiring of package OM4085s.
Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
CHIP DIMENSIONS AND BONDING PAD LOCATIONS
OM4085
handbook, full pagewidth
S8
S7
S6
25
24
23
22
S5
21
20
19
18
17
16 15 BP1 BP2 BP0 VLCD
S9 S10 S11 S12 S13 S14 S15 S16 S17 S18
26 27 28 29 30 31 32 33 34 35 36 S19 37 S20 38 S21 39 S22 40 S23 1 SDA 2 SCL 3 SYNC 4 CLK 0 0
BP3 14 13 12
2.5 mm(1) y S2 S4 S3 S1 S0
11 10
VSS SA0 A2 A1 A0 OSC
x
2.91(1) mm
OM4085
9 8 7 6 5 VDD
MBH949
(1) Typical value. Pad size: 120 x 120 m Chip area: 7.27 mm. The numbers given in the small squares refer to the pad numbers.
Fig.25 Bonding pad locations.
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
Table 16 Bonding pad locations (dimensions in mm) All x/y coordinates are referenced to centre of chip, (see Fig.25) PAD NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 SYMBOL SDA SCL SYNC CLK VDD OSC A0 A1 A2 SA0 VSS VLCD BP0 BP2 BP1 BP3 S0 S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 x 200 400 605 856 1062 1080 1080 1080 1080 1080 1080 1080 1080 1080 1080 1074 674 674 474 274 -274 -474 -674 -874 -1074 -1080 -1080 -1080 -1080 -1080 -1080 -1080 -1080 -1080 -1080 -1056 -830 -630 -430 -230 y -1235 -1235 -1235 -1235 -1235 -1025 -825 -625 -425 -225 -25 347 547 747 947 1235 1235 1235 1235 1235 1235 1235 1235 1235 1235 765 565 365 165 -35 -235 -435 -635 -835 -1035 -1235 -1235 -1235 -1235 -1235
OM4085
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
PACKAGE OUTLINE VSO40: plastic very small outline package; 40 leads
OM4085
SOT158-1
D
E
A X
c y HE vMA
Z 40 21
Q A2 A1 pin 1 index Lp L 1 e bp 20 wM detail X (A 3) A
0
5 scale
10 mm
DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT mm inches A max. 2.70 0.11 A1 0.3 0.1 A2 2.45 2.25 A3 0.25 bp 0.42 0.30 c 0.22 0.14 D (1) 15.6 15.2 E (2) 7.6 7.5 0.30 0.29 e 0.762 0.03 HE 12.3 11.8 0.48 0.46 L 2.25 Lp 1.7 1.5 Q 1.15 1.05 v 0.2 w 0.1 y 0.1 Z (1) 0.6 0.3
0.012 0.096 0.017 0.0087 0.61 0.010 0.004 0.089 0.012 0.0055 0.60
0.067 0.089 0.059
0.045 0.024 0.008 0.004 0.004 0.041 0.012
7o 0o
Notes 1. Plastic or metal protrusions of 0.4 mm maximum per side are not included. 2. Plastic interlead protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION SOT158-1 REFERENCES IEC JEDEC EIAJ EUROPEAN PROJECTION
ISSUE DATE 92-11-17 95-01-24
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
SOLDERING Introduction There is no soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used. This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our "IC Package Databook" (order code 9398 652 90011). Reflow soldering Reflow soldering techniques are suitable for all VSO packages. Reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement. Several techniques exist for reflowing; for example, thermal conduction by heated belt. Dwell times vary between 50 and 300 seconds depending on heating method. Typical reflow temperatures range from 215 to 250 C. Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 minutes at 45 C. Wave soldering
OM4085
Wave soldering techniques can be used for all VSO packages if the following conditions are observed: * A double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. * The longitudinal axis of the package footprint must be parallel to the solder flow. * The package footprint must incorporate solder thieves at the downstream end. During placement and before soldering, the package must be fixed with a droplet of adhesive. The adhesive can be applied by screen printing, pin transfer or syringe dispensing. The package can be soldered after the adhesive is cured. Maximum permissible solder temperature is 260 C, and maximum duration of package immersion in solder is 10 seconds, if cooled to less than 150 C within 6 seconds. Typical dwell time is 4 seconds at 250 C. A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. Repairing soldered joints Fix the component by first soldering two diagonallyopposite end leads. Use only a low voltage soldering iron (less than 24 V) applied to the flat part of the lead. Contact time must be limited to 10 seconds at up to 300 C. When using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 C.
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
DEFINITIONS Data sheet status Objective specification Preliminary specification Product specification Limiting values
OM4085
This data sheet contains target or goal specifications for product development. This data sheet contains preliminary data; supplementary data may be published later. This data sheet contains final product specifications.
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. PURCHASE OF PHILIPS I2C COMPONENTS
Purchase of Philips I2C components conveys a license under the Philips' I2C patent to use the components in the I2C system provided the system conforms to the I2C specification defined by Philips. This specification can be ordered using the code 9398 393 40011.
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Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
NOTES
OM4085
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Philips Semiconductors - a worldwide company
Argentina: see South America Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113, Tel. +61 2 9805 4455, Fax. +61 2 9805 4466 Austria: Computerstr. 6, A-1101 WIEN, P.O. Box 213, Tel. +43 1 60 101, Fax. +43 1 60 101 1210 Belarus: Hotel Minsk Business Center, Bld. 3, r. 1211, Volodarski Str. 6, 220050 MINSK, Tel. +375 172 200 733, Fax. +375 172 200 773 Belgium: see The Netherlands Brazil: see South America Bulgaria: Philips Bulgaria Ltd., Energoproject, 15th floor, 51 James Bourchier Blvd., 1407 SOFIA, Tel. +359 2 689 211, Fax. +359 2 689 102 Canada: PHILIPS SEMICONDUCTORS/COMPONENTS, Tel. +1 800 234 7381 China/Hong Kong: 501 Hong Kong Industrial Technology Centre, 72 Tat Chee Avenue, Kowloon Tong, HONG KONG, Tel. +852 2319 7888, Fax. +852 2319 7700 Colombia: see South America Czech Republic: see Austria Denmark: Prags Boulevard 80, PB 1919, DK-2300 COPENHAGEN S, Tel. +45 32 88 2636, Fax. +45 31 57 1949 Finland: Sinikalliontie 3, FIN-02630 ESPOO, Tel. +358 9 615800, Fax. +358 9 61580/xxx France: 4 Rue du Port-aux-Vins, BP317, 92156 SURESNES Cedex, Tel. +33 1 40 99 6161, Fax. +33 1 40 99 6427 Germany: Hammerbrookstrae 69, D-20097 HAMBURG, Tel. +49 40 23 53 60, Fax. +49 40 23 536 300 Greece: No. 15, 25th March Street, GR 17778 TAVROS/ATHENS, Tel. +30 1 4894 339/239, Fax. +30 1 4814 240 Hungary: see Austria India: Philips INDIA Ltd, Shivsagar Estate, A Block, Dr. Annie Besant Rd. Worli, MUMBAI 400 018, Tel. +91 22 4938 541, Fax. +91 22 4938 722 Indonesia: see Singapore Ireland: Newstead, Clonskeagh, DUBLIN 14, Tel. +353 1 7640 000, Fax. +353 1 7640 200 Israel: RAPAC Electronics, 7 Kehilat Saloniki St, TEL AVIV 61180, Tel. +972 3 645 0444, Fax. +972 3 649 1007 Italy: PHILIPS SEMICONDUCTORS, Piazza IV Novembre 3, 20124 MILANO, Tel. +39 2 6752 2531, Fax. +39 2 6752 2557 Japan: Philips Bldg 13-37, Kohnan 2-chome, Minato-ku, TOKYO 108, Tel. +81 3 3740 5130, Fax. +81 3 3740 5077 Korea: Philips House, 260-199 Itaewon-dong, Yongsan-ku, SEOUL, Tel. +82 2 709 1412, Fax. +82 2 709 1415 Malaysia: No. 76 Jalan Universiti, 46200 PETALING JAYA, SELANGOR, Tel. +60 3 750 5214, Fax. +60 3 757 4880 Mexico: 5900 Gateway East, Suite 200, EL PASO, TEXAS 79905, Tel. +9-5 800 234 7381 Middle East: see Italy Netherlands: Postbus 90050, 5600 PB EINDHOVEN, Bldg. VB, Tel. +31 40 27 82785, Fax. +31 40 27 88399 New Zealand: 2 Wagener Place, C.P.O. Box 1041, AUCKLAND, Tel. +64 9 849 4160, Fax. +64 9 849 7811 Norway: Box 1, Manglerud 0612, OSLO, Tel. +47 22 74 8000, Fax. +47 22 74 8341 Philippines: Philips Semiconductors Philippines Inc., 106 Valero St. Salcedo Village, P.O. Box 2108 MCC, MAKATI, Metro MANILA, Tel. +63 2 816 6380, Fax. +63 2 817 3474 Poland: Ul. Lukiska 10, PL 04-123 WARSZAWA, Tel. +48 22 612 2831, Fax. +48 22 612 2327 Portugal: see Spain Romania: see Italy Russia: Philips Russia, Ul. Usatcheva 35A, 119048 MOSCOW, Tel. +7 095 755 6918, Fax. +7 095 755 6919 Singapore: Lorong 1, Toa Payoh, SINGAPORE 1231, Tel. +65 350 2538, Fax. +65 251 6500 Slovakia: see Austria Slovenia: see Italy South Africa: S.A. PHILIPS Pty Ltd., 195-215 Main Road Martindale, 2092 JOHANNESBURG, P.O. Box 7430 Johannesburg 2000, Tel. +27 11 470 5911, Fax. +27 11 470 5494 South America: Rua do Rocio 220, 5th floor, Suite 51, 04552-903 Sao Paulo, SAO PAULO - SP, Brazil, Tel. +55 11 821 2333, Fax. +55 11 829 1849 Spain: Balmes 22, 08007 BARCELONA, Tel. +34 3 301 6312, Fax. +34 3 301 4107 Sweden: Kottbygatan 7, Akalla, S-16485 STOCKHOLM, Tel. +46 8 632 2000, Fax. +46 8 632 2745 Switzerland: Allmendstrasse 140, CH-8027 ZURICH, Tel. +41 1 488 2686, Fax. +41 1 481 7730 Taiwan: Philips Semiconductors, 6F, No. 96, Chien Kuo N. Rd., Sec. 1, TAIPEI, Taiwan Tel. +886 2 2134 2870, Fax. +886 2 2134 2874 Thailand: PHILIPS ELECTRONICS (THAILAND) Ltd., 209/2 Sanpavuth-Bangna Road Prakanong, BANGKOK 10260, Tel. +66 2 745 4090, Fax. +66 2 398 0793 Turkey: Talatpasa Cad. No. 5, 80640 GULTEPE/ISTANBUL, Tel. +90 212 279 2770, Fax. +90 212 282 6707 Ukraine: PHILIPS UKRAINE, 4 Patrice Lumumba str., Building B, Floor 7, 252042 KIEV, Tel. +380 44 264 2776, Fax. +380 44 268 0461 United Kingdom: Philips Semiconductors Ltd., 276 Bath Road, Hayes, MIDDLESEX UB3 5BX, Tel. +44 181 730 5000, Fax. +44 181 754 8421 United States: 811 East Arques Avenue, SUNNYVALE, CA 94088-3409, Tel. +1 800 234 7381 Uruguay: see South America Vietnam: see Singapore Yugoslavia: PHILIPS, Trg N. Pasica 5/v, 11000 BEOGRAD, Tel. +381 11 625 344, Fax.+381 11 635 777
For all other countries apply to: Philips Semiconductors, Marketing & Sales Communications, Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. +31 40 27 24825 (c) Philips Electronics N.V. 1997
Internet: http://www.semiconductors.philips.com
SCA53
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.
Printed in The Netherlands
417067/25/02/pp36
Date of release: 1997 Feb 25
Document order number:
9397 750 01676

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