HT7704
Touc h Dim mer
Pin Assignment Pad Assignment
Feature
•Operating voltage: 4~ 10V
•High noise immunity CMOS technology
•High sensitivity and stability
•Polarity insensitive with AC line
•Minimal external compon ents required
•Loading range of sense input from 0 t o 1000pf
•50/60 Hz selectable
•HT7704A: 3 steps control
HT7704B: 4 steps control
HT7704 C: On/off switch
•8 pin DIP/SOP package
General Description
The HT7704 series are CMOS LSIs in 8-lead DIP
package. They are designed to control the bright-
ness of an incandescent lamp by changing the
triggering angles of the TRIAC with touch sense
input.
HT7704 is a selectable 3-step, 4-step or on/off
switch function dimmer. High sensitivity and
stability account for its eminent performance.
The se nse input can sustain very heavy capaci-
tive loading and propagate sense through a
highly resistive line. In addition, the applica-
tion circuit is very simple.
Chip size: 1640 × 1620 (µm)2
* The IC substrate should be connected to VSS
in the PCB layout artwork.
1 27th Dec ’96