STE2004DIE1 STMicroelectronics, STE2004DIE1 Datasheet - Page 9

• Manufacturer Part Number: STE2004DIE1
• Description: 102 x 65 SINGLE CHIP LCD CONTROLLER / DRIVER
• Manufacturer: STMicroelectronics

3.7 Temperature Coefficients
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. STE2004 provides the possibility to change the VLCD
in a linear fashion against temperature with eight different Temperature Coefficient selectable through T2,
T1 and T0 bits. Only four of them are available through basic instruction set.
Table 5.
Table 6.
Figure 7.
Finally, the V
V
A
LCD
1
NAME
TC0
TC1
TC2
TC3
TC4
TC5
TC6
TC7
00h 01h 02h 03h 04h 05h ….
NAME
TC0
TC2
TC3
TC6
LCD
voltage at a given (T) temperature can be calculated as:
B
PRS = [0;0]
A
T2
0
0
0
0
0
1
1
1
1
+ B
7Ch 7Dh 7Eh
TC1
0
0
1
1
7Fh 00h 01h 02h
V
LCD
A
(T) = V
1
T1
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
7Ch
T0
0
1
0
1
0
1
0
1
7Dh 7Eh 7Fh
00h 01h 02h 03h 04h
A
2
-0.35 · 10
-1.05· 10
-1.75· 10
-1.05· 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
05h
….
7Ch
7Dh 7Eh 7Fh
1/ °C
1/ °C
Unit
1/°C
1/°C
1/°C
1/°C
1/°C
1/°C
1/°C
STE2004
Unit
1/°C
1/°C
1/°C
V
9/66
O