HT7703.PDF

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HT7703

Touch Dimmer

Features

·

Wide operating voltage: 8V~12V

·

Reducing the power dissipation

·

Provided brightness control of incandescent

lamps without using mechanical switches

·

Operating on 60/50 Hz line frequency

·

Touch sensitive sensor input

General Description

The HT7703 is a monolithic CMOS circuit de-

signed for brightness control of incandescent

lamps. The output of the HT7703 triggers a

triac connected in series with the lamp. There

are four specified levels of brightness through

which the output can be stepped. The stepping

function may be selected to operate in one of two

different modes by a MODE selector.

Pin Assignment

Block Diagram

1

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HT7703

Pin Description

Pin No. Pin Name

Description

1

ZC

Zero crossing input

2

OSC1

Oscillator 1

3

OSC2

Oscillator 2

4

SENSE

Touch sense input

5

T1

Touch signal detector 1

6

T2

Touch signal detector 2

7

VDD

Positive power supply

8

60/50

60/50 Hz selection

9

MODE

Mode selection

10

NC

No connection

11

OUT

Trigger output

12

NC

No connection

13

VSS

Negative power supply

14

PWR

Power on reset

Electrical Characteristics

Test Condition

Symbol

Parameter

Min. Typ. Max. Unit

V DD Condition

V DD

Operation Voltage

—

—

8

10

12

V

I DD

Operation Current

10V No load

—

0.5

1

mA

V IL

“Low” Input Voltage

10V

—

—

—

2

V

V IH

“High” Input Voltage

10V

—

8

—

—

V

R PU1

Pull-Up Resistance (60/50, MODE) 10V V I =0V

400

600

800

K

W

R PU2

Pull-Up Resistance (PWR)

10V V I =0V

1

1.5

2

M

W

I OL

Sink Current (OUT)

10V V OUT =1V

25

80

—

mA

I OH

Source Current (OUT)

10V V OUT =9V

–20

–60

—

m

A

F CLK

Clock Frequency

10V Rosc=68K

—

180K

—

Hz

2

26th Mar ’97

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HT7703

Function Description

The operating mode of the circuit is selected by a MODE input as follows:

After power on, the initial state stays off. Following that, whenever the sensor plate is touched, the

output jumps to the next level of brightness.

Application Circuit

3

26th Mar ’97

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