pcf8814 NXP Semiconductors, pcf8814 Datasheet - Page 41

• Manufacturer Part Number: pcf8814
• Description: Pcf8814 65 X 96 Pixels Matrix Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
11.12 Voltage monitor
The voltage monitor is an integrated test circuit which
indicates the status of the charge pump via the VM bit. In
normal operation the charge pump will be switching on and
off regularly and it is this operation that is checked each
frame. Care must be taken when configuring the charge
pump. Setting the number of stages too few, the V
voltage too high or using a low V
incorrectly-operating change pump.
2003 Mar 13
handbook, full pagewidth
65
96 pixels matrix LCD driver
row number 0
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
1
2
3
4
5
6
7
8
9
X
X
X
X
first row = 0 (C = 0)
DD2
Fig.38 Order of selection of rows for p = 4 and p = 2.
X
X
X
X
can all lead to an
P = 2
X
X
X
X
X
X
X
X
OP
X
X
X
X
41
Table 27 Voltage monitor bit VMs
row number 0
BIT VM
0
1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
1
2
3
4
5
6
7
8
9
X
X
X
X
indicates the charge pump is not
working correctly
indicates the charge pump is working
correctly
X
X
X
X
first row = 0 (C = 0)
X
X
X
X
CHARGE PUMP STATUS
X
X
X
X
P = 4
X
X
X
X
X
X
X
X
X
X
X
X
Objective specification
X
X
X
X
MBL590
PCF8814
X
X
X
X