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7106L-D40-T Datasheet(PDF) 11 Page - Unisonic Technologies |
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7106L-D40-T Datasheet(HTML) 11 Page - Unisonic Technologies |
11 / 18 page 7106 CMOS IC UNISONICTECHNOLOGIESCO.,LTD 11 of 18 www.unisonic.com.tw QW-R502-018.E DETAILED DESCRIPTION(Cont.) DIGITAL SECTION Fig.5 show the digital section for the UTC 7106, respectively. In the UTC 7106, an internal digital ground is generated from a 6V Zener diode and a large P-Channel source follower. This supply is made stiff to absorb the relative large capacitive currents when the back plane(BP) voltage is switched. The BP frequency is the clock frequency divided by 800. For three readings/sec, this is a 60Hz square wave with a nominal amplitude of 5V. The segments are driven at the same frequency and amplitude and are in phase with BP when OFF, but out of phase when ON. In all cases negligible DC voltage exists across the segments. LCD PHASE DRIVER 7 SEGMENT DECODE 7 SEGMENT DECODE 7 SEGMENT DECODE LATCH 1000 s COUNTER , 100 s COUNTER , 10 s COUNTER , 1 s COUNTER , BACKPLANE ÷200 LOGIC CONTROL ÷ 4 FROM COMPARATOR OUTPUT * THREE INVERTERS ONE INVERTER SHOWN FOR CLARITY CLOCK 40 39 38 OSC 1 OSC 2 OSC 3 Fig.5 Digital Section VTH=1V 26 37 6.2V 500Ω TEST V- V+ 1 21 TYPICAL SEGMENT OUTPUT SEGMENT OUTPUT 2mA 0.5mA V+ INTERNAL DIGITAL GROUND INTERNAL DIGITAL GROUND * a b a b g f e c d a b g f e c d a b g f e c d TO SWITCH DRIVERS |
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