HT819D0 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT819D0

4.2 Second LOG-PCM Speech

Holtek Semiconductor 

HT819D0

• Voice indicator output

FLAG1 is active low when voices are playing.

FLAG1 is also turned low when a voice section

is output. FLAG1 becomes a floating output

after the silence section is output or the voice

output is terminated.

• End-pulse output

The FLAG1 pin outputs an active low pulse

when the voice output is completed. The pulse

width can be programmed depending on the

customer’s requirements.

The FLAG1 as well as FLAG2 pins are both

floating outputs when the chip is in the

standby state.

Volume control

The function of volume control can be set by

mask option. A code is written in the function

table for the purpose of controlling the volume

of each section output after the volume control

function is chosen. There are two volume op-

tions, namely, full range and half range.

AUD

The AUD pin is a PMOS open drain structure.

It outputs voice signals to drive a speaker

through an external NPN transistor when the

chip is active. The AUD pin becomes a floating

output when the chip is in the standby state.

The 8050 type transistor with hFE≅150 is rec-

ommended for an output driver.

Timing Diagram

One key operation

• Sequential-retriggerable

• Sequential-nonretriggerable

8

6th May ’98

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