NXP Semiconductors
UM10300
User Manual OM6290
UM10300_1
© NXP B.V. 2008. All rights reserved.
User manual
Rev. 1.0— 8 August 2008
12 of 30
3.2.3 Block
diagram
mgw571
CURSOR AND DATA CONTROL
SHIFT REGISTER 5
×
12 BIT
DATA LATCHES
COLUMN DRIVERS
80
5
80
CHARACTER
GENERATOR
RAM (128
×
5)
(CGRAM)
16 CHARACTERS
CHARACTER
GENERATOR
ROM
(CGROM)
240 CHARACTERS
DISPLAY DATA RAM
(DDRAM)
80 CHARACTERS/BYTES
ADDRESS COUNTER
(AC)
INSTRUCTION
DECODER
INSTRUCTION
REGISTER
ROW DRIVERS
SHIFT REGISTER 18-BIT
BIAS
VOLTAGE
GENERATOR
VLCD
GENERATOR
BUSY
FLAG
DATA
REGISTER
(DR)
I/O BUFFER
OSCILLATOR
TIMING
GENERATOR
DISPLAY
ADDRESS
COUNTER
V
DD1
V
LCD2
V
SS1
T1
V
LCD1
44 to 49
V
LCDSENSE
36
37 to 43
22 to 29
20
T2
21
T3
153
163
1 to 6
V
DD2
7 to 14
V
DD3
15 to 18
C1 to C80
R17DUP
R1 to R18
OSC
PD
PCF2119x
DB0 to DB2
DB3/SA0
DB4 to DB7
E
R/W
RS
SCL
SDA
18
18
80
5
168
100
155
POR
154
7
7
7
8
7
7
8
8
8
160 to 162
60 to 99,
101 to 140
51 to 59,
141 to 149
164 to 167
156,
157
151,
152
159
158
19
V
SS2
30 to 35
Fig 3. Block diagram PCF2119x
3.3 Graphic Driver PCF8531
3.3.1 General
Description
The PCF8531 is a low power CMOS LCD row/column driver, designed to drive dot matrix
graphic displays (32 rows x 128 columns) at multiplex rates of 1:17, 1:26 and 1:34.
Furthermore, it can drive up to 128 icons. All necessary functions for the display are
provided in a single chip, including on-chip generation of V
LCD
and the LCD bias