HT81003 datasheet(8/11 Pages) HOLTEK

8 / 11 page

HT81003/HT81R03

July 24, 2000

Preliminary

· 6Hz/6HzB flash

When voices are playing, the FLAG1 pin

outputs a 6Hz signal to drive a LED. The

signal is active low, 25% duty. Once the voice

output is terminated, the FLAG1 pin be-

comes a floating output. When the FLAG1

and the FLAG2 pins are optioned as 6HzB

and 6Hz outputs, they will alternately out-

put at a 6Hz rate.

· Busy output

When a voice group is playing, the outputs of

both FLAG1 and FLAG2 are turned low, indi-

cating that the chip is busy.

In addition to the above-stated output sig-

nals, FLAG1 can also generate one of the fol-

lowing signals by code option:

¨ 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 the 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.

I/O2

The I/O2 pin is a PWM structure. It outputs

voice signals to drive a speaker through an ex-

ternal NPN transistor when the chip is active.

The OUT1 and OUT2 pins are configured as

PWM structure which can drive 8/16/32W

speaker directly.

An 8050 type transistor with hFE@150 is recom-

mended for an output driver.

AU D

FL A G

: F l o a t i ng

AU D

FL A G

: F l oat i ng

AU D

FL A G

: F l oat i ng

AU D

FL A G

: F l oat i ng

OU T 1

OS C I

OU T 2

R OS C

H T 81003/ H T 81R 03

SP K

I/O 2

OS C I

R OS C

SP K

V DD

H T 81003/ H T 81R 03

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