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OM4085 Datasheet(PDF) 5 Page - NXP Semiconductors |
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OM4085 Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 36 page  1997 Feb 25 5 Philips Semiconductors Product specification Universal LCD driver for low multiplex rates OM4085 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. 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 ACTIVE BACKPLANE OUTPUTS NUMBER OF SEGMENTS 7-SEGMENT NUMERIC 14-SEGMENT ALPHANUMERIC DOT MATRIX 4 96 12 digits + 12 indicator symbols 6 characters + 12 indicator symbols 96 dots (4 × 24) 3 72 9 digits + 9 indicator symbols 4 characters + 16 indicator symbols 72 dots (3 × 24) 2 48 6 digits + 6 indicator symbols 3 characters + 6 indicator symbols 48 dots (2 × 24) 1 24 3 digits + 3 indicator symbols 1 character + 10 indicator symbols 24 dots Fig.3 Typical system configuration. handbook, full pagewidth HOST MICRO- PROCESSOR/ MICRO- CONTROLLER SDA SCL OSC 1 17 to 40 13 to 16 2 6 78 512 910 11 24 segment drives 4 backplanes LCD PANEL (up to 96 elements) OM4085 A0 A1 A2 SA0 VDD VDD VLCD VSS VSS MBH951 R ≤ trise 2 Cbus |
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