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DATA SHEET

Product speciﬁcation

File under Integrated Circuits, IC12

1998 Jun 18

INTEGRATED CIRCUITS

OM4068

LCD driver for low multiplex rates

Summary of content (28 pages)

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INTEGRATED CIRCUITS DATA SHEET OM4068 LCD driver for low multiplex rates Product specification File under Integrated Circuits, IC12 1998 Jun 18
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates FEATURES APPLICATIONS • Single-chip LCD controller/driver • Telecom equipment • Static/duplex/triplex drive modes with up to 32/64/96 LCD segments drive capability per device • Portable instruments • Selectable backplane drive configuration: static or 2 or 3 backplane multiplexing • Automotive equipment.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates BLOCK DIAGRAM BP1 handbook, full pagewidth BP2 SEG1 to SEG32(1) BP3 32 DISPLAY SEGMENT OUTPUTS BACKPLANE OUTPUTS 4 M0 M1 4 LCD VOLTAGE SELECTOR (CONTROL LOGIC) DISPLAY LATCH SCE 4 VLCD SCLK BIAS VOLTAGE GENERATOR SHIFT REGISTER SDIN SDOUT OM4068 POWER-ON RESET TIMING GENERATOR OSCILLATOR MBK817 VSS VDD (1) SEG1, SEG6, SEG15 and SEG25 are not available in DIP40 package. Fig.1 Block diagram.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates PINNING See notes 1 to 8.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates PIN SYMBOL DESCRIPTION QFP44 DIP40 SEG27 42 13 LCD segment driver output 27 SEG28 43 14 LCD segment driver output 28 SEG29 44 15 LCD segment driver output 29 SEG30 1 16 LCD segment driver output 30 SEG31 2 17 LCD segment driver output 31 SEG32 3 18 LCD segment driver output 32 Notes 1. SEG1 to SEG32 (LCD segment driver outputs) output the multi-level signals for the LCD segments. 2.
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Philips Semiconductors Product specification OM4068 SEG30 1 33 SEG18 SEG31 2 32 SEG17 SEG32 3 31 SEG16 VLCD 4 30 SEG15 VDD 5 29 SEG14 VSS 6 M0 7 27 SEG12 M1 8 26 SEG11 SDIN 9 25 SEG10 OM4068H 28 SEG13 6 SEG7 22 SEG6 21 SEG5 20 SEG4 19 SEG3 18 SEG2 17 SEG1 16 BP3 15 23 SEG8 BP2 14 SCE 11 BP1 13 24 SEG9 SDOUT 12 SCLK 10 Fig.2 Pin configuration (QFP44).
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates handbook, halfpage SEG13 1 40 SEG12 SEG14 2 39 SEG11 SEG16 3 38 SEG10 SEG17 4 37 SEG9 SEG18 5 36 SEG8 SEG19 6 35 SEG7 SEG20 7 34 SEG5 SEG21 8 33 SEG4 SEG22 9 32 SEG3 SEG23 10 31 SEG2 OM4068P SEG24 11 30 BP3 SEG26 12 29 BP2 SEG27 13 28 BP1 SEG28 14 27 SDOUT SEG29 15 26 SCE SEG30 16 25 SCLK SEG31 17 24 SDIN SEG32 18 23 M1 VLCD 19 22 M0 VDD 20 21 VSS MBK815 Fig.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates The display configurations possible with the OM4068 depend on the number of active backplane outputs required; a selection of display configurations is given in Table 1. FUNCTIONAL DESCRIPTION The OM4068 is a low-power LCD driver designed to interface with any microprocessor/microcontroller and a wide variety of LCDs. It can drive any static or multiplexed LCD containing up to three backplanes and up to 96 segments.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates The bias levels depend on the multiplex rate and are selected automatically when the display configuration is selected using M1 and M0. Power-on reset The on-chip power-on reset block initializes the chip after power-on or power failures.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates Table 3 LCD drive modes: summary of characteristics NUMBER OF LCD DRIVE MODE BACKPLANES Static 1 1:2 1:3 LEVELS LCD BIAS CONFIGURATION V off ( rms ) ----------------------V OP V on ( rms ) ----------------------V OP V on ( rms ) D = ---------------------V off ( rms ) 2 static 0 1 − 3 1⁄ 2 0.354 0.791 2.2236 4 1⁄ 3 0.333 0.638 1.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates 1 : 2 MULTIPLEX DRIVE MODE When two backplanes are provided in the LCD, the 1 : 2 multiplex mode applies, as shown in Fig.6.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates handbook, full pagewidth SEG N SEG N + 1 SEG N + 2 SEG N + 3 SEG N + 4 SEG N + 5 SEG N + 6 SEG N + 7 Tframe Tframe Tframe Tframe VLCD VLCD VLCD VLCD 2/3VLCD 1/3VLCD VSS 2/3VLCD 0V −2/3VLCD 2/3VLCD 0V −2/3VLCD 2/3VLCD 0V −2/3VLCD −VLCD −VLCD −VLCD VLCD VLCD VLCD VLCD 2/3VLCD 1/3VLCD VSS 2/3VLCD 0V −2/3VLCD 2/3VLCD 0V −2/3VLCD 2/3VLCD 0V −2/3VLCD −VLCD −VLCD −VLCD VLCD VLCD VLCD 2/3VL
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates Oscillator Interface to microprocessor unit: serial interface The internal logic and the multi-level LCD drive signals of the OM4068 are generated by the built-in RC oscillator. No external components are required. A three-line bus structure enables serial unidirectional data transfer with microprocessors/microcontrollers.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates Display latch Timing The 96-bit 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 and the LCD segment outputs. An LCD segment is activated when the corresponding data bit in the display latch is HIGH. The timing of the OM4068 organizes the internal data flow of the device.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates handbook, full pagewidth SDIN D32A D32B D32C M0 MUX M1 SCLK SDOUT Fig.10 Shift register structure.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates Table 4 Relationships between data bit numbers and the LCD segment outputs DRIVING MODE SEGMENT NUMBER STATIC SEG1 D1A D1A D1B D1A D1B D1C SEG2 D2A D2A D2B D2A D2B D2C SEG3 D3A D3A D3B D3A D3B D3C SEG4 D4A D4A D4B D4A D4B D4C SEG5 D5A D5A D5B D5A D5B D5C SEG6 D6A D6A D6B D6A D6B D6C SEG7 D7A D7A D7B D7A D7B D7C SEG8 D8A D8A D8B D8A D8B D8C SEG9 D9A D9A D9B
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates Backplane outputs The LCD drive section includes three backplane outputs (BP1 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 three backplane outputs are required the unused outputs should be left open-circuit. In 1 : 2 multiplex drive mode, BP3 is set to 1⁄2VLCD.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates DC CHARACTERISTICS VDD = 2.5 to 5.5 V; VSS = 0 V; VLCD = 3.5 to 6.5 V; Tamb = −40 to +105 °C; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Supplies VDD supply voltage VSS + 2.5 − 5.5 V VLCD LCD supply voltage VSS + 3.5 − 6.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates AC CHARACTERISTICS VDD = 2.5 to 5.5 V; VSS = 0 V; VLCD = 5.0 V; Tamb = −40 to +105 °C; unless otherwise specified. SYMBOL PARAMETER MIN. TYP. MAX. UNIT ffr(LCD) LCD frame frequency (internal clock) 50 84 175 Hz fosc oscillator frequency (not available at any pin) 116 224 405 kHz Bus timing characteristics: serial bus interface; note 1 fSCLK SCLK clock frequency 0 − 2.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates 2.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates Table 5 Bonding pad locations (dimensions in µm). All x/y coordinates are referenced to bottom left corner of chip (see Fig.12). SYMBOL PAD x SYMBOL y PAD x y VDD 5 43.100 970.500 SEG28 43 550.550 1711.100 VSS 6 42.900 791.850 SEG29 44 430.550 1711.100 M0 7 43.100 661.750 SEG30 1 300.550 1711.100 2 43.100 1460.050 M1 8 43.100 531.750 SEG31 SDIN 9 43.100 401.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates PACKAGE OUTLINES QFP44: plastic quad flat package; 44 leads (lead length 1.3 mm); body 10 x 10 x 1.75 mm SOT307-2 c y X A 33 23 34 22 ZE e E HE A A2 wM (A 3) A1 θ bp Lp pin 1 index L 12 44 1 detail X 11 wM bp e ZD v M A D B HD v M B 0 2.5 5 mm scale DIMENSIONS (mm are the original dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HD HE L Lp v w y mm 2.10 0.25 0.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates seating plane DIP40: plastic dual in-line package; 40 leads (600 mil) SOT129-1 ME D A2 L A A1 c e Z w M b1 (e 1) b MH 21 40 pin 1 index E 1 20 0 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 min. A2 max. b b1 c mm 4.7 0.51 4.0 1.70 1.14 0.53 0.38 0.36 0.23 52.50 51.50 inches 0.19 0.020 0.16 0.067 0.045 0.021 0.015 0.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates The choice of heating method may be influenced by larger plastic QFP packages (44 leads, or more). If infrared or vapour phase heating is used and the large packages are not absolutely dry (less than 0.1% moisture content by weight), vaporization of the small amount of moisture in them can cause cracking of the plastic body.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates 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. REPAIRING SOLDERED JOINTS Fix the component by first soldering two diagonallyopposite end leads.
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates NOTES 1998 Jun 18 26
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Philips Semiconductors Product specification OM4068 LCD driver for low multiplex rates NOTES 1998 Jun 18 27
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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. +43 160 1010, Fax. +43 160 101 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.