ICL7663S_05 Datasheet, PDF (8/8 Pages) Intersil Corporation – CMOS Programmable Micropower Positive Voltage Regulator

ICL7663S
Generating a Temperature Compensated Display Drive Voltage
Temperature has an important effect in the variation of
threshold voltage in multiplexed LCD displays. As
temperature rises, the threshold voltage goes down. For
applications where the display temperature varies widely, a
temperature compensated display voltage, V_DISP, can be
generated using the ICL7663S. This is shown in Figure 11
for the ICM7233 triplexed LCD display driver.
+5V
LOGIC
SYSTEM,
PROCESSOR,
ETC.
GND
V+_IN
V_OUT1
V_OUT2
ICL7663S
V_SET
V_TC
1.8MΩ
300kΩ
GND
2.7MΩ
V+
ICM7233
V_DISP
GND
DATA BUS
FIGURE 11. GENERATING A MULTIPLEXED LCD DISPLAY DRIVE VOLTAGE
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8
FN3180.5
July 21, 2005