HT817D0 datasheet(10/15 Pages) HOLTEK

10 / 15 page

HT817D0

March 15, 2000

In addition to the above-stated output sig-

nals, FLAG1 can also generate one of the fol-

lowing signals by code option:

Voice indicator output

FLAG1 is active low when voices are play-

ing. FLAG1 is also turned low when a voice

section is output. The brightness of FLAG1

varies with the volume. FLAG1 becomes

floating after the silence section is output or

the voice output is terminated.

End-pulse output

When the voice output is completed, the

FLAG1 pin outputs an active low pulse. 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.

AU D

FL A G

: F l oat i n g

AU D

FL A G

: F l oat i n g

VD D

OS C 2

OS C 1

VS S

AU D

R OS C

H T 817D 0

8050

V DD

SP K

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