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STE2004S датащи(PDF) 12 Page - STMicroelectronics

номер детали STE2004S
подробное описание детали  102 x 65 single-chip LCD controller/driver
PDF  79 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STE2004S датащи(HTML) 12 Page - STMicroelectronics

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Circuit description
STE2004S
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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:
VLCD(T=To) = VLCDo = (Ai+VOP · B)
(i=0,1,2)
with the following values:
Note that the three PRS values produce three adjacent ranges for VLCD. If the VOP 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 VLCD is:
VLCD(to) = 6.85 · Vth
than:
Table 3. Bias level m=65 and m=49
Symbol
m = 65 (1/9)
m = 49 (1/8)
V1
VLCD
VLCD
V2
8/9*VLCD
7/8*VLCD
V3
7/9*VLCD
6/8*VLCD
V4
2/9*V VLCD
2/8*VLCD
V5
1/9 *VLCD
1/8*VLCD
V6
VSS
VSS
Table 4. LCD voltage generation
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]
B0.0303V
To
27
°C
V
LCD
1m
+
21
1
m
---------
–
⎝⎠
⎛⎞
⋅
---------------------------------------
V
th
⋅
=
V
op
6.85
V
th
A
i
–
⋅
()
0.03
--------------------------------------------
=



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