HT7712B/ht7713b touch dimmer pin assignment block diagram features high noise immunity cmos technology operating voltage: 10v line frequency: 60hz or 50hz. high sensitivity and stability polarity insensitive with ac line loading range of sense input from 0 to 1200pf minimum peripheral components general description the HT7712B/ht7713b is a cmos fabricated lsi chip in an 8-lead dip package. it is de- signed to control the brightness of lamps by changing the firing angles of the triac through a touch sensitive input. the chip can be used either as a 3-step or a switch function dimmer. the high sensitivity and stability of the HT7712B/ht7713b ensure its high per- formance. the touch sensitive input can sustain very heavy capacitive loading and propagate sense through a highly resistive line. the appli- cation circuit of the HT7712B/ht7713b is very simple. of these two chips, the ht7713b is a 3-step dimmer controller whose trigger angles are set at 17 , 86 , 121 where 17 is the brightest, 86 the medium brightness, and 121 the dark- est. the HT7712B, on the other hand, is an on/off switch whose on state is set at an angle of 17 . 1 26th mar 97 www.datasheet.in
pad coordinates unit : mil pad no. x y pad no. x y 1 C35.33 20.07 6 35.24 5.13 2 C35.33 11.97 7 35.24 12.96 3 C35.33 C21.60 8 35.24 23.22 4 C35.33 C29.70 9 C7.16 29.43 5 30.83 C29.70 10 C26.33 29.43 chip size: 85 73 (mil) 2 * the ic substrate should be connected to vdd in the pcb layout artwork. pin description pin no. pin name description 1 sen touch sense input 2 fb feedback signal to control the sink current of sen pin 3 trig trigger output to drive the triac 4 vss negative power terminal 5 fse line frequency selection (floating: 60hz ; vss: 50hz) 6 osc oscillator input 7 zc line frequency 60hz or 50hz input for zero crossing 8 vdd positive power terminal absolute maximum rating supply voltage ............................... C0.3v to 13v storage temp ............................. C50 c to 125 c input voltage..................v ss C0.3v to v dd +0.3v operating temp ..................................0 to 70 c HT7712B/13b 2 26th mar 97 www.datasheet.in
electrical characteristics (ta=25 c) symbol parameter test condition min. max. unit v dd condition v dd dc supply voltage 9 11 v i ol trig sink current 10v v ol =2v 30 ma i oh trig drive current 10v v oh =5v C1 ma i leak i/p leakage current 10v 0.5 m a typical application circuit HT7712B/13b 3 26th mar 97 www.datasheet.in
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