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| 7106_15 Datasheet, PDF (10/18 Pages) Unisonic Technologies – CONVERTERS | |||
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7106
CMOS IC
 DETAILED DESCRIPTION(Cont.)
TEST
The TEST pin serves two function. On the UTC 7106 it is coupled to the internally generated digital supply through
a 500⦠resistor. Thus it can be used as the negative supply for externally generated segment drivers such as
decimal points or any other presentation the user may want to include on the LCD display. Fig.3 and 4 show such an
application. No more than a 1mA load should be applied.
The second function is a âlamp testâ. When TEST is pulled high (to V+) all segments will be turned on and the
display should read â1888â. The TEST pin will sink about 15mA under these conditions.
CAUTION: In the lamp test mode, the segments have a constant DC voltage (no square-wave) . This may burn the
LCD display if maintained for extended periods.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
10 of 18
QW-R502-018.E
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