STE2004S datasheet(13/79 Pages) STMICROELECTRONICS

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STE2004S

Circuit description

13/79

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.

Figure 7.

Temperature coefficients

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

VLCD(T) = VLCDo · [1 + (T-To) · TC]

Table 5. Temperature coefficients with basic instruction set

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

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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