HT815D0 datasheet(5/15 Pages) HOLTEK

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Electrical Characteristics

Ta=25°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

VDD

Operating Voltage

¾¾

2.4

5.0

IDD

Operating Current

No load

200

400

ISTB

Standby Current

¾¾

Max. AUD Output Current

VOH=0.6V

-1.5

-2

IOL

FLAG Sink Current

VOL=0.3V

1.5

3.0

VIH

²H² Input Voltage

¾¾

0.8VDD

VDD

VIL

²L² Input Voltage

¾¾

0.2VDD

fOSC

Oscillating Frequency

ROSC=530kW

116

kHz

HT815D0

March 15, 2000

Functional Description

The HT815D0 is a mask ROM type voice synthe-

sizer with 11.2-second voice capacity. A group of

pre-recorded voice sections is played upon receipt

of key trigger input signals. Two FLAG signals

are output while playing voices.

The 11.2-second voice capacity can be divided

into sections of arbitrary length. Notice that the

silence length and end-pulse width are not in-

cluded in the memory.

By using Holtek¢s programming tools, the con-

tents and arrangement of sections, key features

and FLAG output are all programmable before

device fabrication.

The IC provides 12 key inputs (KEY1~KEY12).

Of the 12 keys, KEY1 can be optioned as a di-

rect, sequential or random trigger key. KEY12

can be selected as a stop or direct key. The re-

maining 10 keys (KEY2~KEY11), are used as

direct keys exclusively.

Play function block diagram

System oscillator

The HT815D0 has a built-in RC oscillator which

requires only one external resistor for normal ap-

plications. The oscillator frequency is typically

96kHz for an external resistor of 530kW. The re-

quired oscillator frequency may vary with differ-

ent sampling rates in the process of voice

programming. As a result, the value of the oscilla-

tor resistor may be different for different items.

Ke y

t ri g ger

Ke y

f eat u res

op t i on

Ke y

fu n c ti o n

ta b l e

RO M

Vo i c e

RO M

D/ A

P l a y c o n tro l l o g i c

Fl a g

out put

V DD

H T 815D 0

OS C 1

OS C 2

R OS C

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