HT2844T Holtek, HT2844T Datasheet

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HT2844T

Manufacturer Part Number
HT2844T
Description
4-Sound Generator
Manufacturer
Holtek
Datasheet
Features
General Description
The HT2844 is a CMOS LSI chip designed for
use in sound effect products. It is equipped with
tone circuit, noise circuit, and other control
logic to generate various sounds including rifle
fire, machine gun, booming, door bell, Alarm,
Pin Assignment
Single power supply: 2.4V~3.3V
Low standby current: 1 A (Typ.)
at V
Auto power-off function
DD
= 3V
1
and so forth. Customer’s supplied sound source
can be analyzed and programmed into an inter-
nal ROM by changing a mask layer during de-
vice fabrication. The HT2844 is suitable for
various toy applications.
Pad Assignment
* The IC substrate should be connected to VDD
in the PCB layout artwork.
4-Sound Generator
Eight different sound sections
Speaker or direct piezo application
LED flash drive output
Minimal external components
Chip size: 81
67 (mil)
HT2844
2
11th July ’97

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HT2844T Summary of contents

Page 1

Features Single power supply: 2.4V~3.3V Low standby current (Typ Auto power-off function General Description The HT2844 is a CMOS LSI chip designed for use in sound effect products equipped with tone ...

Page 2

Block Diagram Pad Coordinates Pad No Pad No. 1 –33.53 27.05 2 –33.53 18.30 3 –33.53 10.22 4 –33.53 –14.34 5 –16.96 –27.04 6 –7.43 –27.04 7 2.51 –27.04 Pin Description Pin No. Pin Name I/O 1 TEST2 ...

Page 3

Pin No. Pin Name I/O 12 KEY1 I KEY1 input, low active 13 KEY2 I KEY2 input, low active 14 KEY3 I KEY3 input, low active 15 KEY4 I KEY4 input, low active 16 LED O LED flash output Absolute ...

Page 4

Timing Diagram 4 11th July ’97 HT2844 ...

Page 5

Application Circuits (HT2844 — Four Toy Gun Sounds) Speaker application 5 11th July ’97 HT2844 ...

Page 6

Piezo application 6 11th July ’97 HT2844 ...

Page 7

Application Circuits (HT2844C — Four Animal Sounds) Speaker application 7 11th July ’97 HT2844 ...

Page 8

Piezo application 8 11th July ’97 HT2844 ...

Page 9

Application Circuits (HT2844M — Four Helicopter Sounds) Speaker application 9 11th July ’97 HT2844 ...

Page 10

Piezo application 10 HT2844 11th July ’97 ...

Page 11

Application Circuits (HT2844N — Four Racing Car Sounds) Speaker application 11 HT2844 11th July ’97 ...

Page 12

Piezo application 12 HT2844 11th July ’97 ...

Page 13

Application Circuits (HT2844P — Four Jet aircraft Sounds) Speaker application 13 HT2844 11th July ’97 ...

Page 14

Piezo application 14 HT2844 11th July ’97 ...

Page 15

Application Circuits (HT2844S — Four Morning Call Sounds) Speaker application 15 HT2844 11th July ’97 ...

Page 16

Piezo application 16 HT2844 11th July ’97 ...

Page 17

... Application Circuits (HT2844T — Four Alarm Sounds) Speaker application 17 HT2844 11th July ’97 ...

Page 18

Piezo application 18 HT2844 11th July ’97 ...

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