STE2004SDIE2 STMicroelectronics, STE2004SDIE2 Datasheet - Page 13

• Manufacturer Part Number: STE2004SDIE2
• Description: 102 x 65 single-chip LCD controller/driver
• Manufacturer: STMicroelectronics

STE2004S
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
Table 6. Temperature coefficients
Figure 7.
Finally, the V
V
A
LCD
1
NAME
TC0
TC1
TC2
TC3
TC4
TC5
TC6
TC7
NAME
00h 01h 02h 03h 04h 05h ….
TC0
TC2
TC3
TC6
LCD
Temperature coefficients
B
PRS = [0;0]
voltage at a given (T) temperature can be calculated as:
A
T2
0
0
0
0
0
1
1
1
1
+ B
7Ch 7Dh 7Eh
TC1
0
0
1
1
V
LCD
7Fh 00h 01h 02h
(T) = V
A
T1
1
0
0
1
1
0
0
1
1
03h 04h
LCD
PRS = [0;1]
o · [1 + (T-To) · TC]
05h ….
TC0
0
1
0
1
T0
7Ch
0
1
0
1
0
1
0
1
7Dh 7Eh 7Fh
00h 01h 02h 03h 04h
A
-0.35 · 10
2
-1.05· 10
-1.05· 10
-1.75· 10
-0.7 · 10
-1.4 · 10
-2.1 · 10
-0.7 · 10
-2.1 · 10
-0.0· 10
-0.0· 10
-2.3· 10
Value
Value
PRS = [1;0]
-3
-3
-3
-3
-3
-3
-3
-3
-3
-3
-3
-3
Circuit description
05h
….
7Ch
7Dh 7Eh 7Fh
1/ °C
1/ °C
Unit
1/°C
1/°C
1/°C
1/°C
1/°C
1/°C
1/°C
Unit
1/°C
1/°C
1/°C
13/79
V
O