HT8656 datasheet(6/11 Pages) HOLTEK

6 / 11 page

DRAM Type

(MS)

Sampling

Rate

(16KB)

Recording

Capacity

64Kb

32Kb

2 seconds

64Kb

16Kb

4 seconds

256Kb

32Kb

8 seconds

256Kb

16Kb

16 seconds

Recording starts whenever a sound input is

detected. It then stops once a 0.5 seconds si-

lence is detected or the recording capacity is

full. After that, talking back comes into play.

Play function

The HT8656 stops to play back the recorded

sounds when an interval of silence lasts 0.5

seconds during recording. Its sampling rate is

the same as the rate of recording sounds.

Power control

The HT8656 provides a START pin for power

control. The START pin is of high impedance

and switch Q is turned off initially. After the

START pin is triggered, it will remain at a low

level and switch Q is turned on. The START pin

is of high impedance and the chip’s power is

switched off when a REC/PLAY cycle has been

implemented 64 times or an interval of silence

lasts over 2 minutes.

Motor

The HT8656 provides a motor driving pin. The

motor is turned on during playing but off once

talking back is terminated.

LED

The LED pin displays the status of the HT8656.

LED is switched ON when the IC is in the

standby state. Its intensity varies inversely

with the sound volume when the IC is in the

recording state. In the playing state, the LED is

switched OFF.

HT8656

5th May ’98

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