FN4539 Rev 3.00

Page 13 of 13

October 21, 2004

HC5549

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Pin Description

PLCC

SYMBOL

DESCRIPTION

1

TIP

TIP power amplifier output.

2

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.

3

VBL

Low battery supply connection.

4

VBH

High battery supply connection.

5

SW+

Uncommitted switch positive terminal.

6

SW-

Uncommitted switch negative terminal.

7SWC

Switch control input. This TTL compatible input controls the uncommitted switch, with a logic “0” enabling the switch and

logic “1” disabling the switch.

8

F2

Mode control input - MSB. F2-F0 for the TTL compatible parallel control interface for controlling the various modes of

operation of the device.

9

F1

Mode control input.

10

F0

Mode control input.

11

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.

12

DET

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.

13

ALM

Thermal Shutdown Alarm. This pin signals the internal die temperature has exceeded safe operating temperature and

the device has been powered down automatically.

14

AGND

Analog ground reference. This pin should be externally connected to BGND.

15

BSEL

Selects between high and low battery, with a logic “1” selecting the high battery and logic “0” the low battery.

16

NC

This pin is a “no connect” and should remain floating proper device operation.

17

POL

Capacitor connected to this pin sets the polarity reversal slew rate.

18

VRB

Ringing Bias Input - Analog input to offset Tip output towards ground while in Ringing Mode.

19

VRX

Analog Receive Voltage - 4-wire analog audio input voltage. AC couples to codec.

20

VTX

Transmit output voltage - Output of impedance matching amplifier, AC couples to codec.

21

VFB

Feedback voltage for impedance matching. This voltage is scaled to accomplish impedance matching.

22

-IN

Impedance matching amplifier summing node.

23

VCC

Positive voltage power supply.

24

CDC

DC Biasing Filter Capacitor - Connects between this pin and VCC.

25

RTD

Ring trip filter network.

26

ILIM

Loop Current Limit programming resistor.

27

RD

Switch hook detection threshold programming resistor.

28

RING

RING power amplifier output.