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7106L-R40-R Datasheet(PDF) 10 Page - Unisonic Technologies |
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7106L-R40-R Datasheet(HTML) 10 Page - Unisonic Technologies |
10 / 18 page 7106 CMOS IC UNISONICTECHNOLOGIESCO.,LTD 10 of 18 www.unisonic.com.tw QW-R502-018.E 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 500Ω 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 “lamp test”. When TEST is pulled high (to V+) all segments will be turned on and the display should read ”1888”. 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. |
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