EM6124 datasheet(7/25 Pages) EMMICRO

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EM6124

www.emmicroelectronic.com

Typical VLCD Programming

Fig. 8

Temperature Control

Due to the temperature dependency of liquid cristals

viscosity the LCD controlling voltage VLCD must be

increased for lower temperatures to maintain optimal

contrast. The EM6124 is available with 4 different

temperature coefficients (see Fig. 9). The coefficient is

selected by 2 bits in the initialization code TC bits 10 and

11. Table 11 shows the typical values of the different

temperature coefficients. They are proportional to the

programmed VLCD.

Typical Values of the Temperature Coefficients

Bit 10, Bit 11

Value

Unit

0 0

0 1

1 0

1 1

-0.2 x VLCD

-0.52 x VLCD

-1.16 x VLCD

-1.82 x VLCD

mV/°C

Table 11

Temperature Coefficients

Fig. 9

Checker and Checker Inverse

A fast check display can be easily created setting

initialization bits 12 and 13 (called “Checker” and “Inv.

Checker”). The display is completely checked with only 2

initialization sequences, one “Checker” and one “Inv.

Checker”. For Checker, the pattern fills the display with

alternately ON and OFF pixels as shown in Fig. 10. For

Inv. Checker, everything is inverted (see Fig.18.14 and

18.15).

Pattern of Checker Mode

Fig. 10

Internally Generated VLCD versus Temperature

Fig. 11

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