Data Sheet AS25 33-36 austriamicrosystems
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
Frequency Comparator Input
T
his is a Schmitt trigger input for ring frequency discrimination. Disabled during off-hook.
22 LED
LED Output Driver
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
Current Shunt Control Output
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 V
SS
Negative Power Supply
27 LI
Line Input
This input is used for power extraction and line current sensing.
28 RI
Receive Input
This is the input for the receive signal.
1 LS
Line Current Sense Input
This is the input for sensing the line current.
2 MFL
MF Level Setting
A voltage divider connected from this pin to A
GND
and V
SS
can be used to set the DTMF level.
3 RO
Receive Output
This is the output for driving a dynamic earpiece with an impedance of 150 to 300 Ω.
Selection Overview
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).
ams AG
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