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PDF AS2525 Data sheet ( Hoja de datos )
| Número de pieza | AS2525 | |
| Descripción | Single-Chip Handsfree Phone CMOS Integrated Circuit | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS2525 (archivo pdf) en la parte inferior de esta página. Total 27 Páginas | ||
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Single-Chip Handsfree Phone
CMOS Integrated Circuit
AS2525
austriamicrosystems
DATA SHEET
Key Features
- Line/speech handsfree circuit, LD/MF repertory dialler,
and tone ringer on one 44 pin CMOS chip
- Operating range from 15 to 100 mA line current (down
to 5 mA with slightly reduced performance)
- All significant parameters programmable with external
EEPROM
- Volume control of receiver signal
- Handsfree function with enhanced voice switching
- Low noise (max. -72 dBmp)
- Unique EMC performance
- LD/MF switchable dialing with temporary MF mode
- Repertory dialing with last number redial and memory
dialing (8 x 2 direct and 12 indirect)
- Call restriction with PIN code
- Serial interface for EEPROM and LCD driver
- 2-tone/3-tone ringer with ring frequency detection
Package
Available in 44 pin TQFP.
Block Diagram
General Description
The AS2525 is a CMOS mixed-mode integrated circuit for
use in feature phones, answering machines and fax
machines. It contains an analogue line interface and
speech circuit for a/b terminals, loudhearing, handsfree,
enhanced LD/MF dialler, tone ringer with dc/dc converter
and serial interface to EEPROM and LCD-driver (AS2591),
all in a 44 pin package. The circuit is fully line powered.
The AS2525 uses an external EEPROM for a 32 digit last
number redial storage and memories for 28 numbers each
containing up to 24 digits/data.
The device provides a volume control for the earpiece and
the loudspeaker. The volume can be controlled by pressing
the [V-]/[V+] keys.
The versatility of the circuit is provided by programming all
parameters through an external EEPROM. This allows easy
adaptation to various PTT requirements worldwide.
30 Ω
300 Ω
ZBAL
LI
CS
SS
VPP
VSS
CI
RI
STB
AS2525
–+
+
VPP
VSS
–
+
LS
LINE
SENSE
VDD
VDD
SUPPLY
FT2
AGND
CBN FT1
VREF
AGND
NOISE
DET.
AGND
PEAK
DET.
–
+
PEAK
DET.
VOICE
SWITCHING
HS
HF
DM/HM
DEBOUNCE
DTMF
MELODY
+
–
VPP
FCI
DPN
LED
CPU
DIALLER
KEYSCANNING
OSCILLATOR
DC/DC
CONVERTER
DI DO CLK
CS1 CS2
KEYBOARD (C1-4/R1-3)
3.58
MHz
CM
M1
M2
M3
M4
LO1
LO2
VSSA
RECI
RECV
RO
VDD
VDD
Revision 2.1
Page 1 of 27
1 page  
Datasheet AS2525
austriamicrosystems
Key Definitions and Procedures
Table 1: Key definitions
Key Condition
[0] - [9],
[#], [∗]
Off-hook
[∗] LD mode
Speech mode
[PG] Program mode
Speech mode
[MT] Mute state
Program mode
[R/P]
[FL]
[V+]
[V-]
[MR]
[M1] - [M8]
[SH]
Program state
Speech mode
Speech mode
Function
Digits
Temporary MF select
Enter program state
Exit program state
Enter mute state
Exit mute state
Enter blank
Redial/Pause
Pause
Flash function
Volume control
Volume control
Memory redial key
Memory dial
Second function (shift)
Remark
Function depending on mode
Providing mixed mode dialing (default LD selected)
To enter the program state
To terminate/exit program state
To enter mute state
To terminate/exit mute state
To enter blank digit during programming
Allows re-signaling of the last dialed number and
insertion of pauses
Each key pressure inserts a pause
Invokes a timed loop break
To increase the receive gain
To increase or decrease the receive gain
To access memory by key codes
Access keys to memories 1 to 8 and 9 to 16
To access second function of keys
Table 2: Digits
Digit Key
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[∗]
[#]
DTMF Mode
(fLOW + fHIGH)
941 + 1336 Hz
697 + 1209 Hz
697 + 1336 Hz
697 + 1477 Hz
770 + 1209 Hz
770 + 1336 Hz
770 + 1477 Hz
852 + 1209 Hz
852 + 1336 Hz
852 + 1477 Hz
941 + 1209 Hz
941 + 1477 Hz
Pulse Mode
10 pulses
1 pulse
2 pulses
3 pulses
4 pulses
5 pulses
6 pulses
7 pulses
8 pulses
9 pulses
Temporary MF select
-
Programming Mode
([PG] + Digit)
To enter PIN protected programming
Select flash duration
Select dialing mode
Select pause duration
Key lock toggle
Ringer volume
Ringer melody
LCD contrast
Ringer on/off
Memory Location
([MR] + Digit)
Memory 17
Memory 18
Memory 19
Memory 20
Memory 21
Memory 22
Memory 23
Memory 24
Memory 25
Memory 26
-
-
Revision 2.1
Page 5 of 27
5 Page 
Datasheet AS2525
austriamicrosystems
Table 13: Handset Rx soft clipping selection
[PG] + [0] + (Password) + [#] + [5] + (digit) + [PG]
Digit Handset Rx Soft Clipping (Earpiece)
[0] Disabled
[1] Enabled
There is LLC option for this path.
The gain of the LS —> LO1/LO2 receive path is set to 29
dB.
This gain can be changed by set-up programming from 22
dB to -37 dB in 1 dB steps.
Table 14: Loudspeaker gain setting
[PG] + [0] + (Password) + [0] + [4] + (x) + [PG]
Key
Rx Gain (dB)
Key Rx Gain (dB)
(x)
LS to LO1/2
(x) LS to LO1/2
[0] 22 [8] 30
[1] 23 [9] 31
[2] 24 [M1] 32
[3] 25 [M2] 33
[4] 26 [M3] 34
[5] 27 [M4] 35
[6] 28 [M5] 36
[7] 29 [M6] 37
The user can also change the gain using the [V+]/[V-] keys
(see section "Handsfree"). The volume range is 20 dB (8
steps, each 2.5 dB).
The receive input is the differential signal of RI and STB.
The soft clip circuit limits the output voltage swing at
LO1/LO2 to 1 VPEAK.
Table 15: Loudspeaker soft clipping selection
[PG] + [0] + (Password) + [9] + [3] + (digit) + [PG]
Digit Handsfree Rx Soft Clipping (Loudspeaker)
[0] Disabled
[1] Enabled
There is optional LLC for this path.
Line Loss Compensation (LLC)
The line loss compensation is set-up programmable and
effects only the handset mode.
Table 16: Line loss compensation selection
[PG] + [0] + (Password) + [0] + [5] + (digit) + [PG]
Digit LLC Range
[0] No LLC (gain independent of line current)
[1] -1 dB/5 mA from 20 to 50 mA
[2] -1 dB/5 mA from 45 to 75 mA
When it is activated, the transmit and receive gains for
both channels are decreased by 6 dB at line currents from
20 mA to 50 mA or from 45 mA to 75 mA depending on
selected range.
Handsfree
The handsfree function allows voice communication without
using the handset (full 2-way speaker phone). Two voice
controlled attenuators prevent acoustic coupling between
the loudspeaker and the handsfree microphone.
The voice switching circuit has three states, namely idle,
transmit or receive. In receive mode the attenuation of the
receive path and the transmit path can be controlled by the
volume keys between 0 dB and -20 dB. The following table
(Table 18: Handsfree attenuation scheme) shows how
voice switching is controlled.
voice switching circuit
TX_atten
RX
Voice
switching
speech
Backgnd
noise
monitor
Figure 6: Handsfree voice switching
A background monitoring circuit is incorporated. This
circuit can be enabled/disabled as required.
Table 17: Background noise monitoring selection
[PG] + [0] + (Password) + [#] + [6] + (digit) + [PG]
Digit Background Noise Monitoring
[0] Disabled
[1] Enabled
Revision 2.1
Page 11 of 27
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet AS2525.PDF ] | |
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