HC55185 Intersil Corporation, HC55185 Datasheet - Page 16

• Manufacturer Part Number: HC55185
• Description: VoIP Ringing SLIC Family
• Manufacturer: Intersil Corporation

Pin Descriptions
PLCC
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
1
2
3
4
5
6
7
8
9
SYMBOL
BGND
AGND
BSEL
RING
SWC
SW+
VCC
CDC
VBH
DET
ALM
POL
VRS
VRX
RTD
VBL
SW-
VTX
VFB
ILIM
TIP
RD
E0
-IN
F2
F1
F0
TL
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 for the most negative battery.
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 (see the Device Operating Modes table
shown on page 2).
Detector Output - This TTL output provides on-hook/off-hook status of the loop based upon the selected operating mode.
The detected output will either be switch hook, ground key or ring trip (see the Device Operating Modes table shown on
page 2).
Thermal Shutdown Alarm. This pin signals the internal die temperature has exceeded safe operating temperature
(approximately 175
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.
Programming pin for the transient current limit feature, set by an external resistor to ground.
External capacitor on this pin sets the polarity reversal time.
Ringing Signal Input - Analog input for driving 2-wire interface while in Ring 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, usually +5V.
DC Biasing Filter Capacitor - Connects between this pin and V
Ring trip filter network.
Loop Current Limit programming resistor.
Switch hook detection threshold programming resistor.
RING power amplifier output.
4-16
o
C) and the device has been powered down automatically.
HC55185
DESCRIPTION
CC
.