µPD9903

5

1.

PIN FUNCTIONS

Number

Pin Name

I/O

Function

1-10

NC

–

Leave this pin open.

11

–

+5 V power supply (analog)

12

–

+5 V power supply (digital)

13

–

+5 V power supply (digital)

14

AUX/MODE

I

External signaling input

15

BSY

O

BUSY LED driver output

16

SUS

O

SUS LED driver output

17

RST

I

Pin for reset input and power-on reset

18

EXS

O

19

EXD

O

20

I

Reception highway input [PCM data (8-bit) + CTL data (8-bit)]

21

DCLK

I

Clock input (2.048 MHz)

22

FS

I

8-kHz sync input

23

O

Transmission highway output [PCM data (8-bit) + SCN data (8-bit)]

24

TYPE

O

25

I

Ring-Trip signal input 2

26

I

Ring-Trip signal input 1

27

O

Relay control for network testing

[to the

µPC7073’s pin 22]

28

O

Relay control for line testing

[to the

µPC7073’s pin 21]

29

O

Relay control for ringer transmit

[to the

µPC7073’s pin 20]

30

BCUT

O

High and wet control output

[to the

µPC7073’s pin 19]

31

ALM

O

Control output for ground-fault/power line contact protection mode

[to the

µPC7073’s pin 18]

32

PD

O

Power-down control output

[to the

µPC7073’s pin 17]

33

DGND2

–

34

DGND1

–

35

SUB

–

36

AGND

–

37

I

[to the

µPC7073’s pin 11]

38

O

[to the

µPC7073’s pin 11]

39

O

Analog signal output for receive side

[to the

µPC7073’s pin 10]

40

I

Analog signal input for transmit side

[to the

µPC7073’s pin 9]

41

AGDT

I

Tip-Ring sum current detection input

[to the

µPC7073’s pin 8]

42

ASCN

I

Tip-Ring difference current detection input

[to the

µPC7073’s pin 7]

43

[to the

µPC7073’s pin 6]

Notes 1. SIPO: Serial In Parallel Out

2. Short AGND, DGND1, DGND2, and SUB directly under the IC and connect them to an analog ground.