HT815D0 查看數據表（PDF） - Holtek Semiconductor
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HT815D0 Datasheet PDF : 15 Pages
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HT815D0
Electrical Characteristics
Symbol
Parameter
VDD
IDD
ISTB
IO
IOL
VIH
VIL
fOSC
Operating Voltage
Operating Current
Standby Current
Max. AUD Output Current
FLAG Sink Current
²H² Input Voltage
²L² Input Voltage
Oscillating Frequency
Test Conditions
VDD Conditions
¾
¾
3V No load
3V
¾
3V VOH=0.6V
3V VOL=0.3V
¾
¾
¾
¾
3V ROSC=530kW
Ta=25°C
Min. Typ. Max. Unit
2.4
¾
5.0
V
¾
200 400 mA
¾
1
3
mA
-1.5
-2
¾
mA
1.5
3.0
¾
mA
0.8VDD ¾
VDD
V
0
¾ 0.2VDD V
76
96
116 kHz
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
V DD
K ey
tr ig g e r
K ey
fe a tu re s
o p tio n
K ey
fu n c tio n
ta b le
ROM
V o ic e
ROM
D /A
P la y c o n tr o l lo g ic
F la g
o u tp u t
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.
O SC1
H T815D 0
R O SC
O SC2
5
March 15, 2000
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