Holtek Semiconductor Inc HT9200A, HT9200B Datasheet
Features
•
Operating voltage: 2.0V ~5.5V
•
Serial mode for the HT9200A
•
Serial/parallel mode for the HT9200B
General Description
The HT9200 A/B tone generators are d esigned
for
µC interfaces. They can be instru cted by a
µC to generate 16 dual tones and 8 single tones
from the DTMF p in. The HT9200A provides a
serial mode wh ereas the HT9200B conta ins a
Selection Table
HT9200A/B
DTMF Generators
•
Low standby current
•
Low total harmonic distortion
•
3.58MHz crystal or ceramic resonator
selectable serial/parallel mode interface for
various appl ications such as security systems,
home automation , remote control thro ugh tele phone lines, communication systems, etc.
Block Diagram
1 21st Aug ’98
Pin Assignment
HT9200A/B
Pad Assignment Pad Coordinates
Pad
No.
1 –553.30 430.40 8 553.30 –523.50
2 –553.30 –133.50 9 553.30 –190.30
3 –553.30 –328.50 10 553.30 4.70
4 –553.30 –523.50 11 553.30 340.30
5 –220.10 –523.50 12 374.90 523.50
6 –25.10 –523.50 13 –279.30 523.50
7 308.10 –523.50
Chip size: 1460
* The IC substrate should be connected to VSS in the PCB layout artwork.
× 1470 (µm)
2
XY
Pin Description
Pin Name I/O
CE I
X2 O
X1 I
Internal
Connection
CMOS IN
Pull-high
Oscillator
Description
Chip enable, active low
The system oscillator consists of an inverter, a bias resistor, and
the required load capacitor on chip.
The oscillator function can be implemented by Connect a
standard 3.579545MHz crystal to the X1 and X2 terminals.
Pad
No.
Unit: µm
XY
VSS — — Negative power supply
NC — — No connection
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HT9200A/B
Pin Name I/O
D0~D3 I
S/P I CMOS IN
CLK I
DATA I
DTMF O CMOS OUT Output terminal of the DTMF signal
VDD — — Positive power supply, 2.0V~5.5V for normal operation
Approximate internal connection circuits
Internal
Connection
CMOS IN
Pull-high
or floating
CMOS IN
Pull-high
or floating
CMOS IN
Pull-high
or floating
Description
Data inputs for the parallel mode
When the IC is operating in the serial mod e, the data input
terminals (D0~D3) are included with a pull-high resistor. When
the IC is operating in the parallel mode, these pins become
floating.
Operation mode selection input
S/P=“H”: Parallel mode
S/P=“L”: Serial mode
Data synchronous clock input for the serial mode
When the IC is operating in the parallel mode, the input
terminal (CLK) is included with a pull-high res istor. Whe n the
IC is operating in the serial mode, this pin becomes floating.
Data input terminal for the serial mode
When the IC is operating in the parallel mode, the input terminal
(DATA) is included with a pull-high resistor. When the IC is
operating in the serial mode, this pin becomes floating.
3 21st Aug ’98
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