ST7556 Sitronix Technology, ST7556 Datasheet - Page 26

• Manufacturer Part Number: ST7556
• Description: 65 x 102 Dot Matrix LCD Controller/Driver
• Manufacturer: Sitronix Technology

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ST7556
Set VOP value:
The operation voltage V
Caution
As the programming range for the internally generated VLCDIN allows values above the max allowed VLCDIN, the
customer has to ensure while setting the VOP register that under all condition and including all tolerances the
VLCD limit of max. 13V will never be exceeded. As VLCDIN increases with lower temperatures, care must be taken
not to set a Vop generating a VLCDIN voltage that will exceed the maximum of 10.6V when operating at – 30 ℃ .
Ver 2.2
LCD
Typical values for parameter for the HV-Generator programming
can be set by software.
SYMBOL
V
L2
a
b
a
00
VOP [6:0](programmed) {00 hex… 7F hex}
Fig 13. V
01
b
V
02
0
=( a + V
OP
03
programming of ST7556
26/43
OP
04
× b )
VALUE
6.75
0.03
05
06
.....
7D
7E
UNIT
V
V
7F
2005/10/05
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