µPC7073

5

1.

PIN FUNCTIONS

Number

Pin Name

I/O

Function

1-3

O

DC feedback control output

[to the

µPD9903’s pin 48-46]

4, 5

I

DC feedback control input

[to the

µPD9903’s pin 45, 44]

[to the

µPD9903’s pin 43]

7

ASCN

O

Tip-Ring difference current detection signal output

[to the

µPD9903’s pin 42]

8

AGDT

O

Tip-Ring sum current detection signal output

[to the

µPD9903’s pin 41]

9

BIAS

I

Bias level input. Connect to

[to the

µPD9903’s pin 40]

10

I

Receiving input for 4W side

[to the

µPD9903’s pin 39]

11

ACOM

I

Signal reference voltage (2.4 V TYP) input for 4W side [to the

µPD9903’s pin 37, 38]

12-14, 16,

NC

–

No-connection pins. Leave these pins unconnected.

26, 28, 30,

39, 41, 43

15

GND1

–

Ground pin 1, for circuit grounding

17

PD

I

Power-down control

H: Power-up

TTL level

L: Power-down

[to the

µPD9903’s pin 32]

18

ALM

I

Ground-fault/power line contact protection mode select input

H: Protect mode

TTL level

L: Normal feed

[to the

µPD9903’s pin 31]

19

BCUT

I

Feed-out select input

H: Feed-out

TTL level

L: Normal feed

[to the

µPD9903’s pin 30]

20

I

Relay control for ringer transmission, high active

[to the

µPD9903’s pin 29]

21

I

Relay control for line test, high active

[to the

µPD9903’s pin 28]

22

I

Relay control for network test, high active

[to the

µPD9903’s pin 27]

23

–

Negative power supply (–48 V)

24

O

Feed resistor pin connection for Tip side during ground-fault/power line contact

detection

25

O

Relay control for ringer transmission, open collector

27

O

Relay control for line testing, open collector

29

O

Relay control for network testing, open collector

31

GND2

–

Ground pin 2, relay driver

32

O

Ring feed resistor pin connection for ground-fault/power line contact detection

33

I

TTX (Teletax) signal cancel circuit input pin (+)

34

I

TTX signal cancel circuit input pin (–)

35

O

36

–

Connect to DC feedback capacitor

37

O

Tip-side auxiliary power transistor base connection pin

38

O

40

I/O

Tip pin for 2W side

42

I/O

Ring pin for 2W side

















