Data She et AS25 33-36

Revision 8.10

Page 3 of 25

Pin #

Symbol

Function

17

18

19

20

R4

R3

R2

R1

Keyboard Rows

(see key arrangements in Figure 2, Figure 3 and Figure 4)

21

FCI

This is a Schmitt trigger input for ring frequency discrimination. Disabled during off-hook.

22

LED

Output for driving an LED that will be flashing when in Program/Mute state.

23

24

M1

M2

Microphone Inputs

Differential inputs for the microphone (electret).

25

CS

This N-channel open drain output controls the external high power shunt transistor for the modulation

of the line voltage and for shorting the line during make period of pulse dialing.

26

Negative Power Supply

27

LI

This input is used for power extraction and line current sensing.

28

RI

This is the input for the receive signal.

1

LS

This is the input for sensing the line current.

2

MFL

3

RO

This is the output for driving a dynamic earpiece with an impedance of 150 to 300

Ω.

Selection Overview

Function

AS2533

AS2534/34R

AS2535

AS2536

Direct memories (one-key)

4

0

12

4

Indirect memories (two-key)

10

0

0

10

Repeat dialing

yes

yes

no

yes

LNR key

yes

yes

yes

yes

Pause insertion by LNR key

yes

yes

yes

yes

Pause (PS) key

yes

yes

no

yes

P/M or MT key

P/M

P/M

P/M

P/M

Tone/Pulse (T/P) key

yes

yes

no

yes

Temporary MF by * key

yes

yes

yes

yes

Centrex (A - D) keys

yes

yes

no

yes

Volume (VOL, –/+) keys

yes

yes

yes

yes

Volume reset by off-hook

yes

no

yes

no

Programming of tone ringer

yes

AS2534:yes

AS2534R: no

yes

yes

R3 Flash duration

600 ms

600 ms

600 ms

600 ms

The corresponding product (AS2533-36) can be selected via bond-options (see chapter “Bond options” for details).