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HT9170 Datasheet(PDF) 3 Page - Holtek Semiconductor Inc

Part No. HT9170
Description  DTMF Receiver
Download  12 Pages
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Maker  HOLTEK [Holtek Semiconductor Inc]
Homepage  http://www.holtek.com
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HT9170 Datasheet(HTML) 3 Page - Holtek Semiconductor Inc

 
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Pin Description
Pin Name I/O
Internal
Connection
Description
VP
I OPERATIONAL
AMPLIFIER
Operational amplifier non-inverting input
VN
I
Operational amplifier inverting input
GS
O
Operational amplifier output terminal
VREF
O
VREF
Reference voltage output, normally VDD/2
X1
I
OSCILLATOR
The system oscillator consists of an inverter, a bias resistor
and the necessary load capacitor on chip.
A standard 3.579545MHz crystal connected to X1 and X2 ter-
minals implements the oscillator function.
X2
O
PWDN
I
CMOS IN
Pull-low
Active high. This enables the device to go into power down
mode and inhibits the oscillator. This pin input is internally
pulled down.
INH
I
CMOS IN
Pull-low
Logic high. This inhibits the detection of tones representing
characters A, B, C and D. This pin input is internally pulled
down.
VSS
¾¾
Negative power supply
OE
I
CMOS IN
Pull-high
D0~D3 output enable, high active
D0~D3
O
CMOS OUT
Tristate
Receiving data output terminals
OE=²H²: Output enable
OE=²L²: High impedance
DV
O
CMOS OUT
Data valid output
When the chip receives a valid tone (DTMF) signal, the DV
goes high; otherwise it remains low.
EST
O
CMOS OUT
Early steering output (see Functional Description)
RT/GT
I/O CMOS IN/OUT Tone acquisition time and release time can be set through
connection with external resistor and capacitor.
VDD
¾¾
Positive power supply, 2.5V~5.5V for normal operation
DVB
O
CMOS OUT
One-shot type data valid output, normal high, when the chip
receives a valid time (DTMF) signal, the DVB goes low for
10ms.
HT9170
3
December 20, 1999


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