HT9020A View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
Manufacturer
HT9020A Datasheet PDF : 12 Pages
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HT9020
Pin Name I/O
ENV/END O
DV/LED
O
RTZ/SEL1 I
VREF/SEL2 I/O
SIN
I
B3/RING
I
VSS
—
VDD
—
BUSY/
BREAK
O
Internal
Connection
CMOS OUT
CMOS OUT
CMOS IN
CMOS I/O
(VREF:O
SEL2:I)
CMOS IN
CMOS IN
—
—
CMOS OUT
Description
CPTD mode: While an input signal is within specification,
this pin will output the envelope relative to the input signal
with a typical 40ms timing delay.
ABRC mode: This is an ABR finished indicating signal
output pin. When an ABR counter is full, this pin will output
a 100ms pulse.
CPTD mode: The call progress tone is decoded in this ready
output pin. This pin can be used to trigger a microcontroller to
read the latched data at DIAL, RBK and BUSY
ABRC mode: ABR indicating signal output. While ABR is
active, this pin will output a 0.86Hz, 25% duty cycle clock.
CPTD mode: Output data return to zero select pin
RTZ=VDD; The outputs of DIAL, RBK and BUSY will be
cleared when the input signal is out of specification while in
the 2.32 sec time window.
RTZ=VSS; The outputs of DIAL, RBK and BUSY will be
latched until the next valid data is received.
ABRC mode: Numbers of the busy redial and time of break
selection pin.
CPTD mode: 1/2 VDD reference voltage output pin
When EN=VDD, the device will be turned off and VREF
disabled. All outputs will be pulled low to reduce power
consumption.
ABRC mode: Number of the busy redial and time of break
selection pin.
AC coupled analog signal input pin
CPTD mode: Received busy tone pattern select pin
B3=VDD; BUSY will be set after three successive busy tones
are received.
B3=VSS; BUSY will be set immediately after a busy tone is
received.
ABRC mode: Ringer detection input pin
Negative power supply
2.5~5.5V for CPT mode operation
2.0~5.5V for ABR mode operation
Positive power supply, 2.5~5.5V for normal operation
CPTD mode: BUSY=HIGH: The detected input signal is a
busy or reorder tone
ABRC mode: When in ABR mode, the BREAK pin will be
high. After a busy tone is detected it will return low.
When the break timer has timed out, it will return high.
3
21st Aug ’98
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