NXP Semiconductors
PCF8566
Universal LCD driver for low multiplex rates
5. Block diagram
BP0 BP2 BP1 BP3
13
V
DD
5
R
14
15
16
S0 to S23
17 to 40
DISPLAY SEGMENT OUTPUTS
BACKPLANE
OUTPUTS
R
LCD
VOLTAGE
SELECTOR
DISPLAY LATCH
R
V
LCD
12
LCD BIAS
GENERATOR
SHIFT REGISTER
CLK
SYNC
4
3
TIMING
BLINKER
PCF8566
INPUT
BANK
SELECTOR
DISPLAY
CONTROLLER
DISPLAY
RAM
24
×
4 BITS
OUTPUT
BANK
SELECTOR
OSC
6
OSCILLATOR
POWER-
ON
RESET
COMMAND
DECODER
DATA
POINTER
V
SS
SCL
SDA
11
2
1
INPUT
FILTERS
I
2
C-BUS
CONTROLLER
10
SA0
SUB-
ADDRESS
COUNTER
7
A0
8
A1
9
A2
mgg383
Fig 1. Block diagram of PCF8566
PCF8566_7
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 07 — 25 February 2009
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