STE2004SDIE2 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STE2004SDIE2 Datasheet PDF : 79 Pages
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STE2004S
Circuit description
3.7
Temperature coefficients
As the viscosity, and therefore the contrast, of the LCD are subject to change with
temperature, the LCD voltage must be varied with temperature. STE2004S provides eight
different temperature coefficients to change the VLCD in a linear fashion against
temperature. selectable through T2, T1 and T0 bits. Only four of the temperature coefficients
are available through the basic instruction set.
Table 5. Temperature coefficients with basic instruction set
NAME
TC1
TC0
Value
TC0
0
TC2
0
TC3
1
TC6
1
0
-0.0· 10-3
1
-0.7 · 10-3
0
-1.05· 10-3
1
-2.1 · 10-3
Unit
1/ °C
1/°C
1/°C
1/°C
Table 6. Temperature coefficients
NAME
T2
T1
TC0
0
0
TC1
0
0
TC2
0
1
TC3
0
1
TC4
1
0
TC5
1
0
TC6
1
1
TC7
1
1
T0
Value
Unit
0
-0.0· 10-3
1/ °C
1
-0.35 · 10-3
1/°C
0
-0.7 · 10-3
1/°C
1
-1.05· 10-3
1/°C
0
-1.4 · 10-3
1/°C
1
-1.75· 10-3
1/°C
0
-2.1 · 10-3
1/°C
1
-2.3· 10-3
1/°C
Figure 7.
VLCD
Temperature coefficients
B
A2
A0 + B
A1
A1
00h 01h 02h 03h 04h 05h …. 7Ch 7Dh 7Eh 7Fh 00h 01h 02h 03h 04h 05h …. 7Ch 7Dh 7Eh 7Fh 00h 01h 02h 03h 04h 05h …. 7Ch 7Dh 7Eh 7Fh
PRS = [0;0]
PRS = [0;1]
PRS = [1;0]
VO
Finally, the VLCD voltage at a given (T) temperature can be calculated as:
VLCD(T) = VLCDo · [1 + (T-To) · TC]
13/79
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