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STE2002DIE2 датащи(PDF) 10 Page - STMicroelectronics

номер детали STE2002DIE2
подробное описание детали  81 x 128 single-chip LCD controller/driver
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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STE2002DIE2 датащи(HTML) 10 Page - STMicroelectronics

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Circuit description
STE2002
10/61
2.5
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
then:
Table 4.
LCD voltage values
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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