PCF8578 Datasheet, PDF (4/44 Pages) NXP Semiconductors – LCD row/column driver for dot matrix graphic displays

Philips Semiconductors
LCD row/column driver for dot matrix
graphic displays
5 BLOCK DIAGRAM
Product specification
PCF8578
VDD
V2
V3
V4
V5
VLCD
TEST
9 (20)
10 (21)
11 (22)
12 (23)
13 (24)
14 (25)
6 (12)
POWER-ON
RESET
C39 - C32
R31/C31 - R8/C8
R7 - R0
17 - 56
(29 to 35, 37, 38 to 46
48 to 62, 63, 64, 1 to 6)
(1)
ROW/COLUMN
DRIVERS
PCF8578
DISPLAY
MODE
CONTROLLER
OUTPUT
CONTROLLER
Y DECODER
AND SENSING
AMPLIFIERS
32 x 40-BIT
DISPLAY RAM
DISPLAY
DECODER
X DECODER
SUBADDRESS
COUNTER
RAM DATA POINTER
Y
X
(9) 3
TIMING
GENERATOR
(10) 4
SYNC
CLK
SCL
SDA
2 (8)
1 (7)
INPUT
FILTERS
I²C-BUS
CONTROLLER
15, 16
n.c.
(14, 15, 17 to 19
26 to 28 36, 47)
n.c.
7 (13)
SA0
COMMAND
DECODER
(16) 8
OSCILLATOR
(11) 5
MSA842
OSC
R _OSC
VSS
(1) Operates at LCD voltage levels, all other blocks operate at logic levels.
The pin numbers given in parenthesis refer to the LQFP64 package.
Fig.1 Block diagram.
1998 Sep 08
4