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STE2002DIE2 Datasheet(Hoja de datos) 11 Page - STMicroelectronics

No. de Pieza. STE2002DIE2
Descripción  81 x 128 single-chip LCD controller/driver
Descarga  61 Pages
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Fabricante  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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 11 page
background image
STE2002
Circuit description
11/61
2.6
Temperature coefficient
As the viscosity, and therefore the contrast, of the LCD are subject to change with
temperature, there's the need to vary the LCD Voltage with temperature. The STE2002
provides the possibility to change the VLCD in a linear fashion against temperature with
eight different Temperature Coefficient selectable through the T2, T1 and T0 bits. Only four
of them are available with basic instruction set (TC1 & TC0 Bits).
Figure 4.
LCD voltage
Finally, the VLCD voltage at a given (T) temperature can be calculated as:
VLCD(T) = VLCDo · [1 + (T-To) · TC]
Table 5.
Temperature coefficients
Name
TC1
TC0
Value
Unit
TC0
0
0
-0.0· 10-3
1/ °C
TC2
0
1
-0.7 · 10-3
1/°C
TC3
1
0
-1.05· 10-3
1/°C
TC6
1
1
-2.1 · 10-3
1/°C
Table 6.
Temperature coefficients
Name
TC2
TC1
TC0
Value
Unit
TC0
0
0
0
-0.0· 10-3
1/ °C
TC1
0
0
1
-0.35 · 10-3
1/°C
TC2
0
1
0
-0.7 · 10-3
1/°C
TC3
0
1
1
-1.05· 10-3
1/°C
TC4
1
0
0
-1.4 · 10-3
1/°C
TC5
1
0
1
-1.75· 10-3
1/°C
TC6
1
1
0
-2.1 · 10-3
1/°C
TC7
1
1
1
-2.3· 10-3
1/°C
00h 01h 02h 03h 04h 05h ….
7Fh 00h 01h 02h
7Ch 7Dh 7Eh
03h 04h
7Dh 7Eh 7Fh
05h ….
7Ch
A1
A0
B
A0 + B
PRS = [0;0]
PRS = [0;1]
VO
VLCD
00h 01h 02h 03h 04h
7Dh 7Eh 7Fh
05h
7Ch
PRS = [1;0]
….
A2




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