HT817D0 Datasheet, PDF (5/15 Pages) Holtek Semiconductor Inc – 16.8-Second LOG-PCM Speech

HT817D0
Electrical Characteristics
Symbol
Parameter
V_DD
I_DD
I_STB
I_O
I_OL
V_IH
V_IL
f_OSC
Operating Voltage
Operating Current
Standby Current
Max. AUD Output Current
FLAG Sink Current
²H² Input Voltage
²L² Input Voltage
Oscillating Frequency
Test Conditions
V_DD Conditions
¾
¾
3V No load
3V
¾
3V V_OH=0.6V
3V V_OL=0.3V
¾
¾
¾
¾
3V R_OSC=530kW
Min. Typ. Max. Unit
3.6
¾
5.0
V
¾
200 400 mA
¾
1
3
mA
-1.5
-2
¾
mA
1.5
3.0
¾
mA
0.8V_DD ¾
V_DD
V
0
¾ 0.2V_DD V
76
96
116 kHz
Functional Description
The HT817D0 is a mask ROM type voice synthe-
sizer with 16.8-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 16.8-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, as well as
key features and FLAG output are all program-
mable 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. As for the
remaining 10 keys (KEY2~KEY11), they 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 in g c o n tr o l lo g ic
F la g
o u tp u t
System oscillator
The HT817D0 has a built-in RC oscillator
which requires only one external resistor for
normal applications. The oscillator frequency
is typically 96kHz for an external resistor of
530kW. The required oscillator frequency may
vary with different sampling rates in the pro-
cess of voice programming. As a result, the
value of the oscillator resistor may be differ-
ent for different items.
O SC1
H T817D 0
R O SC
O SC2
5
March 15, 2000