STE2002 STMicroelectronics, STE2002 Datasheet - Page 8

• Manufacturer Part Number: STE2002
• Description: 81 x 128 SINGLE CHIP LCD CONTROLLER / DRIVER
• Manufacturer: STMicroelectronics

STE2002
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 5.
Finally, the V
8/51
V
A
LCD
0
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
TC2
0
0
0
1
1
1
1
1
1
+ B
7Ch 7Dh 7Eh
TC1
0
0
1
1
7Fh 00h 01h 02h
V
LCD
A
TC1
1
(T) = V
0
1
0
1
1
1
1
1
03h 04h
LCD
PRS = [0;1]
o · [1 + (T-To) · TC]
05h ….
TC0
0
1
0
1
TC0
7Ch
0
1
0
1
1
1
1
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
-2.1 · 10
-0.7 · 10
-1.4 · 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
Unit
1/°C
1/°C
1/°C
V
O