2000 Feb 04

4

Philips Semiconductors

Product specification

LCD driver for 140

× 2 segments

PCF8801

PINNING

Note

1. These symbols simplify descriptions in this data sheet where several pads have the same function and also indicate

the direction of data on pads which can be selected to be either an input or an output.

SYMBOL

PAD

SIMPLIFIED

DESCRIPTION

Power supply for output drivers, backplane drivers and LCD

bias generator; 4 pads connected internally

Ground for output drivers, backplane drivers and LCD bias

generator; 4 pads connected internally

16

Power supply for remaining circuitry; connect externally to

15

Ground for remaining circuitry; connect externally to

REXT

10

Enable internal oscillator input; connected via an external

resistor

RESET

14

Reset input; active HIGH

T1 to T3

13, 17, 18

Test pads; must remain unconnected

COM1_1, COM1_2

31, 173

COM1

First pair of identical 3-level LCD backplane outputs; each

pad is located on opposite sides of the die

COM2_1, COM2_2

32, 174

COM2

Second pair of identical 3-level LCD backplane outputs;

each pad is located on opposite sides of the die

DIR

19

Data direction control input; its voltage level determines the

direction in which data is shifted

S1 to S140

33 to 172

LCD driver outputs

DI1, DI2

24, 7

DI

Data input; the status of DIR determines which pad is valid;

each pad is located on opposite sides of the die

DO1, DO2

23, 8

DO

Data outputs; both identical; both always valid; for cascade

use; each pad is located on opposite sides of the die

LDP1, LDP2

26, 5

LDPI, LDPO

Data load control input (LDPI) and output (LDPO) on rising

edge; the status of DIR determines which pad is valid; each

pad is located on opposite sides of the die

LDN1, LDN2

25, 6

LDNI, LDNO

Data load control input (LDNI) and output (LDNO) on falling

edge; the status of DIR determines which pad is valid; each

pad is located on opposite sides of the die

CLK1, CLK2

22, 9

CLKI, CLKO

Data shift clock input (CLKI) and output (CLKO); the status

of DIR determines which pad is valid; for cascade use; each

pad is located on opposite sides of the die

OSC1, OSC2

21, 11

OSCI, OSCO

LCD multiplexing clock input (OSCI) and output (OSCO);

the status of DIR determines which pad is valid; each pad is

located on opposite sides of the die

INT_OSCO1, INT_OSCO2 20, 12

INT_OSCO

Internal oscillator outputs; both identical; each pad is

located on opposite sides of the die