HC55185_06 Datasheet, PDF (18/20 Pages) Intersil Corporation – VoIP Ringing SLIC Family

HC55185
Pin Descriptions
PLCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
QFN
29
30
31
32
1
2
3
4
5
6
7
9
10
11
12
13
14
15
17
18
19
20
21
22
23
24
25
27
SYMBOL
DESCRIPTION
TIP TIP power amplifier output.
BGND 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.
VBL Low battery supply connection.
VBH High battery supply connection for the most negative battery.
SW+ Uncommitted switch positive terminal.
SW- Uncommitted switch negative terminal.
SWC Switch control input. This TTL compatible input controls the uncommitted switch, with a logic “0” enabling the switch
and logic “1” disabling the switch.
F2 Mode Control Input - MSB. F2-F0 for the TTL compatible parallel control interface for controlling the various modes of
operation of the device.
F1 Mode control input.
F0 Mode control input.
E0 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).
DET
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).
ALM Thermal Shutdown Alarm. This pin signals the internal die temperature has exceeded safe operating temperature
(approximately 175°C) and the device has been powered down automatically.
AGND Analog ground reference. This pin should be externally connected to BGND.
BSEL Selects between high and low battery, with a logic “1” selecting the high battery and logic “0” the low battery.
TL Programming pin for the transient current limit feature, set by an external resistor to ground.
POL External capacitor on this pin sets the polarity reversal time.
VRS Ringing Signal Input - Analog input for driving 2-wire interface while in Ring Mode.
VRX Analog Receive Voltage - 4-wire analog audio input voltage. AC couples to CODEC.
VTX Transmit Output Voltage - Output of impedance matching amplifier, AC couples to CODEC.
VFB Feedback voltage for impedance matching. This voltage is scaled to accomplish impedance matching.
-IN Impedance matching amplifier summing node.
VCC Positive voltage power supply, usually +5V.
CDC
RTD
DC Biasing Filter Capacitor - Connects between this pin and V_CC.
Ring trip filter network.
ILIM Loop Current Limit programming resistor.
RD Switch hook detection threshold programming resistor.
RING RING power amplifier output.
18
FN4831.14
December 18, 2006