hc5549 Intersil Corporation, hc5549 Datasheet - Page 13

• Manufacturer Part Number: hc5549
• Description: Low Power Slic With Battery Switch
• Manufacturer: Intersil Corporation

Pin Description
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PLCC
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1
2
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SYMBOL
BGND
AGND
BSEL
RING
SWC
SW+
VCC
CDC
VBH
DET
ALM
POL
VRB
VRX
RTD
VBL
SW-
VTX
VFB
ILIM
TIP
NC
RD
E0
-IN
F2
F1
F0
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TIP power amplifier output.
Battery Ground - To be connected to zero potential. All loop current and longitudinal current flow from this ground.
Internally separate from AGND but it is recommended that it is connected to the same potential as AGND.
Low battery supply connection.
High battery supply connection.
Uncommitted switch positive terminal.
Uncommitted switch negative terminal.
Switch control input. This TTL compatible input controls the uncommitted switch, with a logic “0” enabling the switch and
logic “1” disabling the switch.
Mode control input - MSB. F2-F0 for the TTL compatible parallel control interface for controlling the various modes of
operation of the device.
Mode control input.
Mode control input.
Detector Output Selection Input. This TTL input controls the multiplexing of the SHD (E0=1) and GKD (E0 =0) comparator
outputs to the DET output based upon the state at the F2-F0 pins.
Detector Output - This TTL output provides hook status of the loop based upon the selected operating mode. The
detected output will either be switch hook, ground key or ring trip.
Thermal Shutdown Alarm. This pin signals the internal die temperature has exceeded safe operating temperature and
the device has been powered down automatically.
Analog ground reference. This pin should be externally connected to BGND.
Selects between high and low battery, with a logic “1” selecting the high battery and logic “0” the low battery.
This pin is a “no connect” and should remain floating proper device operation.
Capacitor connected to this pin sets the polarity reversal slew rate.
Ringing Bias Input - Analog input to offset Tip output towards ground while in Ringing Mode.
Analog Receive Voltage - 4-wire analog audio input voltage. AC couples to codec.
Transmit output voltage - Output of impedance matching amplifier, AC couples to codec.
Feedback voltage for impedance matching. This voltage is scaled to accomplish impedance matching.
Impedance matching amplifier summing node.
Positive voltage power supply.
DC Biasing Filter Capacitor - Connects between this pin and VCC.
Ring trip filter network.
Loop Current Limit programming resistor.
Switch hook detection threshold programming resistor.
RING power amplifier output.
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HC5549
DESCRIPTION
FN4539.3