STE2002 Просмотр технического описания (PDF) - STMicroelectronics

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производитель

STE2002

81 x 128 single-chip LCD controller/driver

STMicroelectronics 

STE2002

Circuit description

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).

Table 5. Temperature coefficients

Name

TC1

TC0

TC0

0

0

TC2

0

1

TC3

1

0

TC6

1

1

Value

-0.0· 10-3

-0.7 · 10-3

-1.05· 10-3

-2.1 · 10-3

Unit

1/ °C

1/°C

1/°C

1/°C

Table 6. Temperature coefficients

Name

TC2

TC1

TC0

0

0

TC1

0

0

TC2

0

1

TC3

0

1

TC4

1

0

TC5

1

0

TC6

1

1

TC7

1

1

TC0

Value

0

-0.0· 10-3

1

-0.35 · 10-3

0

-0.7 · 10-3

1

-1.05· 10-3

0

-1.4 · 10-3

1

-1.75· 10-3

0

-2.1 · 10-3

1

-2.3· 10-3

Unit

1/ °C

1/°C

1/°C

1/°C

1/°C

1/°C

1/°C

1/°C

Figure 4. LCD voltage

VLCD

B

A2

A0 + B

A1

A0

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]

11/61

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