Data Sheet AS2522B

Revision 3.4

Page 3 of 19

Pin #

Symbol

Function

22

VPP

Loudspeaker Power Supply

High power supply for the output driver stage

21

CM

This is an output for controlling the external switching converter. During ringing it converts the

ring signal into a 4V supply voltage

27

xCS

Chip select input of the serial interface. Internal pull-up resistor ( 100kOhm )

29

DI

Data input of the serial interface. Internal pull-up resistor ( 100kOhm )

30

CLK

Clock input of the serial interface. Internal pull-up resistor ( 100kOhm )

28

DO

Data output of the serial interface. If xCS=1 DO is in HI-Z state

24

23

LO1

LO2

Output pins for a 50

Ω loudspeaker

1

FT1

Analog input pin for connecting a capacitor for offset cancellation.

2

FT2

Analog input pin for connecting a capacitor for offset cancellation.

20

CBN

Analog input pin for connecting a capacitor for background noise monitoring.

15

RECI

Analog input for the handsfree receive path. Should be connected to RO via coupling

capacitor.

16

RECV

Analog input for receive voice switching path.

25

VSSA

Power supply pin for LS1-LS2 output amplifier.

32

VSSD

Negative Digital Power Supply

26

VDDD

Positive Digital Power Supply