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AS2525F Fiches technique(PDF) 3 Page - ams AG

No de pièce AS2525F
Description  Single-Chip Handsfree Phone CMOS Integrated Circuit
PDF  28 Pages
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Fabricant  AMSCO [ams AG]
Site Internet  http://www.ams.com
Logo AMSCO - ams AG

AS2525F Fiches technique(HTML) 3 Page - ams AG

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Datasheet AS2525
austriamicrosystems
Revision 2.1
Page 2 of 27
Pin Description
Pin #
Symbol
Type
Description
1CS2
DO
Chip Select 2
Chip select signal for external LCD driver circuit or 2 mA LED
If signal is not activated, a pull down resistor (100 k
Ω) is inserted.
2DPn
DO
Dial Pulse Output
Digital output that holds the line during off-hook operation or pulls low during break periods
of pulse dialing and flash.
3HF
DI
HandsFree Switch Input
This is a Schmitt-trigger input that is pulled high to enable handsfree operation.
4HS
DI
HandSet Switch Input
This is a Schmitt-trigger input that is pulled high by the hook switch to enable handset or
headset operation.
5
FT1
AI
Analogue input pin for connecting a capacitor for offset cancellation.
6
FT2
AI
Analogue input pin for connecting a capacitor for offset cancellation.
7M4
AI
Microphone Input 4
Differential input for the handsfree microphone (electret).
8M2
AI
Microphone Input 2
Differential input for the handset microphone (electret).
9M3
AI
Microphone Input 3
Differential input for the handsfree microphone (electret).
10
M1
AI
Microphone Input 1
Differential input for the handset microphone (electret).
11
STB
AI
Side Tone Balance Input
Analogue input for side tone cancellation network.
12
CS
AO
Current Shunt Control Output
N-channel open drain output to control the external high power shunt transistor for
synthesizing ac- and dc-impedance, modulation of line voltage and shorting the line during
make periods of pulse dialing.
13
VSS
Supply
Voltage Source Source
Negative Power Supply.
14
LI
AI
Line Input
Analogue input used for power extraction and line current sensing.
15
RI
AI
Receive Input
Analogue input for ac-separated receive signal.
16
SS
AO
Supply Source Control Output
N-channel open drain output to control the external high power source transistor for
supplying (Vpp) the loudspeaker amplifier in off-hook loudspeaking/handsfree mode.
17
LS
AI
Line Current Sense Input
Analogue input for sensing the line current.
18
CI
AI
Complex Impedance Input
Analogue input pin for the capacitor to program a complex impedance.



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