參數(shù)資料
型號: STE2004SDIE2
廠商: 意法半導體
英文描述: 102 x 65 single-chip LCD controller/driver
中文描述: 102 × 65的單芯片LCD控制器/驅(qū)動器
文件頁數(shù): 12/79頁
文件大?。?/td> 1123K
代理商: STE2004SDIE2
Circuit description
STE2004S
12/79
Table 3. Bias level m=65 and m=49
3.6
LCD voltage generation
The LCD voltage at reference temperature (To = 27°C) can be set using the VOP register content
according to the following formula:
V
LCD
(T=To) = V
LCD
o = (Ai+V
OP
· B)
(i=0,1,2)
with the following values:
Table 4. LCD voltage generation
Note that the three PRS values produce three adjacent ranges for VLCD. If the V
OP
register
and PRS bits are set to zero the internal voltage generator is switched off.
The proper value for the VLCD is a function of the liquid crystal threshold voltage (Vth) and
of the multiplexing rate. A general expression for this is:
For MUX Rate m = 65 the ideal V
LCD
is:
V
LCD(to)
= 6.85 · V
th
than:
Symbol
m = 65 (1/9)
m = 49 (1/8)
V1
V
LCD
V
LCD
V2
8/9*V
LCD
7/8*V
LCD
V3
7/9*V
LCD
6/8*V
LCD
V4
2/9*V V
LCD
2/8*V
LCD
V5
1/9 *V
LCD
1/8*V
LCD
V6
V
SS
V
SS
Symbol
Value
Unit
Note
Ao
2.95
V
PRS = [0;0]
A1
6.83
V
PRS = [0;1]
A2
10.71
V
PRS = [1;0]
B
0.0303
V
To
27
°C
VLCD
2
1
m
--------
---------------+
Vth
=
Vop
6.85
--------------------------------------------
(
)
0.03
=
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