STE2004 datasheet(9/66 Pages) STMICROELECTRONICS

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STE2004

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

VLCD(T) = VLCDo · [1 + (T-To) · TC]

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

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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