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MDB075

LCD

VOLTAGE

SELECTOR

CLOCK SELECT

AND TIMING

BLINKER

TIMEBASE

OSCILLATOR

INPUT

FILTERS

CONTROLLER

POWER-ON

RESET

CLK

SYNC

OSC

SCL

SDA

SA0

BACKPLANE

OUTPUTS

DISPLAY

CONTROLLER

BP0

25

21

20

13

12

15

VDD

14

11

10

19

16

1, 8, 9, 22 to 24, 33, 48

17

18

26

27

28

BP2 BP1 BP3

DISPLAY SEGMENT OUTPUTS

DISPLAY REGISTER

OUTPUT BANK SELECT

AND BLINK CONTROL

29 to 32, 34 to 47,

49 to 64, 2 to 7

S0 to S39

n.c.

A0

A1

A2

PCF8576DH

LCD BIAS

GENERATOR

VSS

VLCD

COMMAND

DECODER

WRITE DATA

CONTROL

DISPLAY

RAM

40

× 4 BIT

DATA POINTER AND

AUTO INCREMENT

SUB-ADDRESS

COUNTER

Fig.1 Block diagram for version PCF8576DH.