HT2887.PDF
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HT2887
Sound Effect and Melody Generator
Features
·
Single power supply: 2.4V~5.0V
·
Auto power-off function
·
Low standby current: 1
m
A (Typ.)
·
Directly drive LEDs or a piezo
(LO1 or LO2 pad by mask option)
at V
DD
=3V
·
Maximum of eight different sound effects
·
128-note melody PLA memory
·
Maximum of three melodies
·
256-note sound effect memory
·
Directly drive a speaker or an LED
(OUT pad by mask option)
·
128kHz system clock
·
Minimum external components
General Description
The HT2887 is a CMOS fabricated LSI de-
signed for use in sound effects products. It con-
tains various sound effects and melody sound
stored sections. Customers are required to sup-
ply their sound samples (on CD ROM, audio
cassette tapes, etc. ), which can then be written
into an internal ROM by changing a mask layer
during device fabrication. The HT2887 is suit-
able for various toy applications.
Pin Assignment
1
10th July ’97
HT2887
The HT2887 package contrast table:
Form
OUT LO1 LO2 DEMO KEY1~KEY8
Remark
8DIP-A-0
—
Ö
Ö
Ö
—
Drive piezo only
8DIP-B-0
Ö
—
Ö
À
—
Drive speaker only
16DIP-A-0, 16SOP-A-0
Ö
À—
Ö
Ö
Drive speaker only
16DIP-B-0, 16SOP-B-0
Ö
À
Ö
Ö
*
KEY1~KEY5 only
18DIP-A-0
Ö
À
Ö
Ö
Ö
—
18DIP-B-0
Ö
—
Ö
Ö
Ö
—
Pad Coordinates
Unit: mil
Pad No. X
Y Pad No. X
Y
1
–42.904 44.179
11
43.541 –28.794
2
–43.116 26.839
12
43.541 12.601
3
–43.159 –9.329
13
43.499 19.316
4
–43.159 –19.656
14
43.499 28.284
5
–42.606 –53.401
15
42.819 53.401
6
–33.809 –53.401
16
8.011 53.401
7
–26.414 –53.401
17
1.381 53.401
8
–17.701 –53.401
18
–8.691 53.401
9
–10.689 –53.401
19
–25.564 53.401
10
43.074 –53.061
Chip size: 98
´
119 (mil)
2
*
The IC substrate should be connected to VDD in the PCB layout artwork.
2
10th July ’97
HT2887
Block Diagram
Pad Description
Pad No. Pad Name I/O
Internal
Connection
Description
2
TEST3
I/O
CMOS
For IC test only
3
DEO
I
CMOS
Pull-High
Key input pad, low active and retriggerable
Connect this pad low to play a melody or melody
with sound effects
4~11
KEY8~KEY1
I
CMOS
Pull-High
Key input pads, low active and retriggerable
Presses a key of KEY1~KEY8 plays a sound effect.
KEY6 and KEY8 can also be defined as a melody
playing function by mask option.
12
VDD
I
—
Power supply (positive)
13
TEST1
I
CMOS
Pull-High
For IC test only
14
TEST2
I/O
CMOS
For IC test only
15
OUT
O
PMOS
Open Drain
Sound output drive speaker, or signal generation to
drive an LED (mask option)
16
OSC1
I
CMOS
Oscillator input
17
OSC2
O
CMOS
Oscillator output
18
VSS
I
—
Power supply (ground)
3
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HT2887
Pad No. Pad Name I/O
Internal
Connection
Description
19, 1
LO1, LO2
O
CMOS
The LO1 and LO2 generate LED drive signals or
sound output signals to drive a piezo (mask option).
Absolute Maximum Ratings*
Supply Voltage .............................. –0.3V to 5.5V
Storage Temperature................. –50
°
C to 125
°
C
Input Voltage..................V
SS
–0.3V to V
DD
+0.3V
Operating Temperature............... –20
°
C to 75
°
C
*Note: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent
damageto the device. These are stress ratings only. Functional operation of this device at
these or any other conditions above those indicated in the operational sections of this
specification is not implied and exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
Electrical Characteristics
(Ta=25
°
C)
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
V
DD
Conditions
V
DD
Operating Voltage
—
—
2.4
3
5.0
V
I
STB
Standby Current
3V
—
—
1
5
m
A
I
DD
Operating Current
3V
F
OSC
=128kHz
No load
—
200
400
m
A
I
OH1
OUT Pad Source Current
3V
V
OH
=0.6V
–0.7
–1
—
mA
I
OH2
LO1, LO2 Pad Source Current 3V
V
OH
=2.7V
–1.0
–1.5
—
mA
I
OL
LO1, LO2 Pad Sink Current
3V
V
OL
=0.3V
2
3
—
mA
V
IH
“H” Input Voltage
—
—
0.8V
DD
——V
IL
“L” Input Voltage
—
—
—
— 0.2V
DD
V
F
OSC
System Frequency
3V
R=120k
W
—128
—kz
Mask Option
The HT2887 provides some mask options to be selected, such as key pressing mode, sound effect or
melody playing, speaker or piezo driving etc., as is shown in the following table.
Operation
Mask Option
Key pressed mode
(for KEY1~KEY8, DEMO)
1) Level hold (retriggerable)
2) Normal mode (retriggerable)
Sound output and LED flash operation
1) OUT drives a speaker and LO1, LO2 drive LEDs
2) LO1, LO2 drive a piezo and OUT drives an LED
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10th July ’97
HT2887
Operation
Mask Option
Sound effect memory
(Total memory is 256 notes)
1) 8 keys, 32 notes per key
2) 4 keys, 64 notes per key
3) 4 keys (32 notes per key) and 2 keys (64 notes per key)
Mask Option
Operation
KEY6
KEY8
DEMO
Melody operating selection
(for KEY6, KEY8 and DEMO.
The total memory is 128 notes)
1
—
—
128 notes
2
32 notes
32 notes
64 notes
3
—
64 notes
64 notes
*
Note: "—" denotes sound effect playing mode.
Timing Diagram
·
Level hold mode
·
Normal mode
5
10th July ’97
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