STE2002 datasheet(11/61 Pages) STMICROELECTRONICS

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STE2002

Circuit description

11/61

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).

Figure 4.

LCD voltage

Finally, the VLCD voltage at a given (T) temperature can be calculated as:

VLCD(T) = VLCDo · [1 + (T-To) · TC]

Table 5.

Temperature coefficients

Name

TC1

TC0

Value

Unit

TC0

-0.0· 10-3

1/ °C

TC2

-0.7 · 10-3

1/°C

TC3

-1.05· 10-3

1/°C

TC6

-2.1 · 10-3

1/°C

Table 6.

Temperature coefficients

Name

TC2

TC1

TC0

Value

Unit

TC0

-0.0· 10-3

1/ °C

TC1

-0.35 · 10-3

1/°C

TC2

-0.7 · 10-3

1/°C

TC3

-1.05· 10-3

1/°C

TC4

-1.4 · 10-3

1/°C

TC5

-1.75· 10-3

1/°C

TC6

-2.1 · 10-3

1/°C

TC7

-2.3· 10-3

1/°C

00h 01h 02h 03h 04h 05h ….

7Fh 00h 01h 02h

7Ch 7Dh 7Eh

03h 04h

7Dh 7Eh 7Fh

05h ….

7Ch

A0 + B

PRS = [0;0]

PRS = [0;1]

VLCD

00h 01h 02h 03h 04h

7Dh 7Eh 7Fh

05h

7Ch

PRS = [1;0]

….

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