Functional Description

Selection table

There are 3 types of HT7704 and the following table illustrates their operating mode:

IC No.

OPT1

OPT2

Function

HT7704A

Open

Open

3 steps of controllable brightness

HT7704B

Open

Bond to VDD

4 steps of controllable brightness

HT7704C

Bond to VDD

Open

On/off the light

Flow Chart

The first touch turns the light on at it’s initial

brightness level. The second touch makes the

light a little brighter. The light is the brightest by

the third touch. Finally, the fourth touch turns

the light off.

Similarly with the 4-step. The first touch tuns

the light on at it’s initial brightness level. The

second touch makes the light brighter. The

brightness increases greatly on the third

touch and reaches it’s brightest on the fourth

touch, respectively. Finally the fifth touch

switches the light off.

HT7704

4

27th Dec ’96