pcf8812 NXP Semiconductors, pcf8812 Datasheet - Page 16

• Manufacturer Part Number: pcf8812
• Description: 65 X 102 Pixels Matrix Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
10.8
The bias voltage levels are set in the ratio of R - R - nR - R - R giving a
require different factors ‘n’ (see Table 4). This is programmed by BS2 to BS0. For MUX1 to MUX65 the optimum bias
value ‘n’ is given by:
Table 4 Programming the required bias system
Table 5 LCD bias voltage
2004 Feb 23
V1
V2
V3
V4
V5
V6
65
Bias system
SYMBOL
BS2
102 pixels matrix LCD driver
0
0
0
0
1
1
1
1
n
=
V
V
-----------------
-----------------
-----------------
-----------------
n
n
n
n
n
n
LCD
SS
BIAS VOLTAGES
65 3
+
+
+
+
2
+
1
+
3
4
2
4
4
4
–
BS1
=
0
0
1
1
0
0
1
1
5.062
=
5
V
8
7
2
1
V
resulting in
/
/
/
/
LCD
SS
9
9
9
9
V
V
V
V
LCD
LCD
LCD
LCD
BS0
16
0
1
0
1
0
1
0
1
1
/
9
BIAS VOLTAGES FOR n = 5 (
bias.
-----------------
n
1
+
4
bias system. Different multiplex rates
n
7
6
5
4
3
2
1
0
1
/
9
1 to 100
1 to 80
1 to 65
1 to 48
1 to 40 or 1 to 34
1 to 24
1 to 18 or 1 to 16
1 to 10 or 1 to 9
or 1 to 8
BIAS)
Product specification
RECOMMENDED
MUX RATE
PCF8812