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STE2004 데이터시트(PDF) 8 Page - STMicroelectronics

부품명 STE2004
상세설명  102 X 65 SINGLE CHIP LCD CONTROLLER / DRIVER
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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STE2004 데이터시트(HTML) 8 Page - STMicroelectronics

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Table 3.
The following table Bias Level for m = 65 and m = 49 are provided:
Table 4.
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 Mul-
tiplexing Rate. A general expression for this is:
For MUX Rate m = 65 the ideal VLCD is:
VLCD(to) = 6.85 · Vth
than:
BS2
BS1
BS0
n
000
7
001
6
010
5
011
4
100
3
101
2
110
1
111
0
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
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
V
LCD
1m
+
21
1
m
---------
–


⋅
------------------------------------ V
th
⋅
=
V
op
6.85 V
th
A
i
–
⋅
()
0.03
-----------------------------------------
=


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