AS2525B [AMSCO]
Single-Chip Handsfree Phone CMOS Integrated Circuit; 单芯片免提电话的CMOS集成电路
| 型号： | AS2525B |
| 厂家： | 
AMS(艾迈斯) |
| 描述： | Single-Chip Handsfree Phone CMOS Integrated Circuit |
| 文件： | 总28页 (文件大小：836K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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austriamicrosystems
Single-Chip Handsfree Phone
CMOS Integrated Circuit
AS2525
DATA SHEET
Key Features
General Description
-
-
-
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
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 (AS591),
all in a 44 pin package. The circuit is fully line powd.
-
-
-
-
-
-
Volume control of receiver signal
Handsfree function with enhanced voice switching
Low noise (max. -72 dBmp)
Unique EMC performance
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.
LD/MF switchable dialing with temporary MF mode
Repertory dialing with last number redial and memory
dialing (8 x 2 direct and 12 indirect)
The device provides a volume control for the earpiece and
the loudspeaker. The olumcan be controlled by pressing
the [V-]/[V+] keys.
-
-
-
Call restriction with PIN code
Serial interface for EEPROM and LCD driver
2-tone/3-tone ringer with ring frequency detection
The versatility of the circuit is provided by programming all
parameterthrough an external EEPROM. This allows easy
adapon to various PTT requirements worldwide.
Package
Available in 44 pin TQFP.
Block Diagram
LS
V
FT2
A
CBN
FT1
D
GND
M1
M2
V
A
GND
DD
V
V
AS2525
DD
30 Ω
LI
LINE
SENSE
NOISE
DET.
V
UPP
REF
+
–
CS
SS
–
+
+
M3
M4
A
DD
GND
PEAK
DET.
V
V
PP
V
V
PP
SS
–
+
VOICE
SS
SWITCHING
V
PP
LO1
LO2
PEAK
DET.
300 Ω
I
–
+
STB
V
SSA
RECI
Z
B
HS
HF
RECV
DTMF
MELODY
DEBOUNCE
DM/HM
RO
FCI
DPN
LED
CPU
DIALLER
DC/DC
KEYSCANNING
OSCILLATOR
CONVERTER
DI DO CLK
CS1 CS2
CM
KEYBOARD (C1-4/R1-3)
3.58
MHz
Revision 2.1
Page 1 of 27
Datasheet AS2525
austriamicrosystems
Pin Description
Pin #
Symbol
Type
Description
1
CS2
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 kΩ) is inserted.
2
DPn
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.
3
4
HF
HS
DI
DI
HandsFree Switch Input
This is a Schmitt-trigger input that is pulled high to enable handsfree operation.
HandSet Switch Input
This is a Schmitt-trigger input that is pulled high by the hook switch to enable handset or
headset operation.
5
6
7
FT1
FT2
M4
AI
AI
AI
Analogue input pin for connecting a capacitor for offset cancellation.
Analogue input pin for connecing a capacitor for offset cancellation.
Microphone Input 4
Differential input for thndsfree microphone (electret).
8
M2
M3
AI
AI
Microphone Input 2
Differential input for the handset microphoe (electret).
9
Microphone Input 3
Differential input for the handsfee mopone (electret).
10
11
12
M1
AI
Micrphone Input 1
Dierential input for the hadset microphone (electret).
STB
CS
AI
STone Balance I
Analogue input for sidne cancellation network.
AO
Current Shunt Contol 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 iods of pulse dialing.
13
14
15
16
VSS
LI
Supply Voltage Source Source
Negative Power Supply.
AI
Line Input
Analogue input used for power extraction and line current sensing.
RI
AI
Receive Input
Analogue input for ac-separated receive signal.
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.
7
18
LS
CI
AI
AI
Line Current Sense Input
Analogue input for sensing the line current.
Complex Impedance Input
Analogue input pin for the capacitor to program a complex impedance.
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Datasheet AS2525
austriamicrosystems
Pin #
Symbol
Type
Description
19
RECI
AI
RECeive Input
Analogue input for the handsfree receive path. Should be connected to RO via a coupling
capacitor.
20
21
RECV
RO
AI
RECeive Voice Switching Input
Analogue input for receive voice switching path.
AO
Receive Output to Handset
Output for driving a dynamic earpiece with an impedance from 150 Ω to 300 Ω.
22
23
VDD
Supply Voltage Drain Drain
Positive Power Supply.
AGND
Supply Analogue Ground
Special ground for the internal amplifiers.
24
25
CBN
CM
AI
Analogue input pin for connecting a capacitor for background noise monitoring.
DO
Converter Make Output
This is an output for controlling the external switching converter. During ringing it converts
the ring signal into a 4V supplvoltage.
Loudspeaker Power Supply
26
VPP
Supply
AO
High power supply for the output driver stage.
27
28
LO1
LO2
Loudspeaker Outputs 1
Output pins for a 32 Ω ( 5 to 50 Ω ) loudspeaker.
Power supply in for LO1-LO2 output amplifer.
29
30
VSSA
Supply
DI
DM/HM
Dial Mode/Headset Mode Swtch Int
Digitainput for choosing between LD and MF dialing or choosing handset and headset
mode. See “Table 3: Parameter settings” for further details. This pin is scanned after manual
offok only.
31
32
33
FCI
LED
OSC
DI
Frequency Comparut
This is a Schmit-trigger input for ring frequency discrimination. Disabled during off-hook.
DO
LED Output
Digital output for connecting 2 mA LED to indicate handsfree mode.
Oscilor Input
Input r ceramic resonator 3.58 MHz.
34
35
36
R1
R2
R3
DI/O
DI/O
Keboard Rows
(see Figure 1: Keyboard Layout).
37
38
39
40
C1
C2
C3
C4
Keyboard Columns
(see Figure 1: Keyboard Layout).
41
CLK
DO
DI
Clock
Clock output for 3-wire bus.
If signal is not activated, a pull down resistor (100 kΩ) is inserted.
42
DI
Data Input
Data input of 3-wire bus.
If signal is not activated, a pull down resistor (100 kΩ) is inserted.
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Datasheet AS2525
austriamicrosystems
Pin #
Symbol
Type
Description
43
DO
DO
Data Output
Data output of 3-wire bus.
A 100 kΩ resistor connected from this pin to VSS enables key locking.
If signal is not activated, a pull down resistor (100 kΩ) is inserted.
44
CS1
DO
Chip Select 1
Chip select signal for external EEPROM.
If signal is not activated, a pull down resistor (100 kΩ) is inserted.
DI:
Digital Input
AI:
AO:
AI/O:
Analogue Input
Analogue Output
Analogue Input/output
DO:
Digital Output
DI/O:
Digital Input/Output
Basic Definitions
Keyboard Layout
Password is set to 0123 and is used to access basic
parameter settings (see Table 3: Parameter settings). The
set-up programming is normally done in the factory during
manufacturing of the telephone sets. The factory settings
can be loaded into the EEPROM (see Figure 3: Memory
allocation for external EEPROM).
C1
C2
C3
C4
R1
R2
1
2
4
5
6
7
8
9
0
#
R3
MR
V+
M1
PG
V-
M2
R/P
MT
M3
FL
SH
M4
M8
PIN code is default set to 1111 and is useby the user to
protect certain user settings (see Table 5: User
programming with PIN code). The PN e can be
changed by the user.
M5
M6
M7
Default settings are shown in bold.
Figure 1: Keyboard Layout
Program procedures are entered with the [PG] key.
Pressing any invalid key or going on-hook during
Maximum RON for key closure: 1 kΩ
programming will abort the program moe d no changes
will be stored. Ending a program proceduy pressing the
[PG] key will store the changes aexit the program mode.
Minimum ROFF for open key: 1 MΩ
See “Table 1: Key definitions” for description of key
functions
Revision 2.1
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Datasheet AS2525
austriamicrosystems
Key Definitions and Procedures
Table 1: Key definitions
Key
Condition
Off-hook
Function
Remark
[0] - [9],
[#], [ ]
Digits
Function depending on mode
LD mode
Temporary MF select
Enter program state
Exit program state
Enter mute state
Exit mute state
Providing mixed mode dialing (default LD selected)
To enter the program state
[ ]
Speech mode
Program mode
Speech mode
Mute state
[PG]
To terminate/exit program state
To enter mute state
To terminate/exit mute state
[MT]
Program mode
Enter blank
To enter blank digit during programming
Redial/Pause
Allows re-signaling of the last dialed number and
insertion of pauses
[R/P]
Program state
Pause
Each key pressure inserta pause
[FL]
[V+]
Flash function
Volume control
Volume control
Memory redial key
Memory dial
Inokes a timed loop break
Speech mode
Speech mode
To increase the receive gain
[V-]
To increase or decrease the receive gain
To accss memory by key codes
Ass keys to memories 1 to 8 and 9 to 16
To access second function of keys
[MR]
[M1] - [M8]
[SH]
Seond function (shift)
Table 2: Digits
DTMF Mode
Programming Mode
([PG] + Digit)
Memory Location
([MR] + Digit)
Digit Key
Pulse Mode
(fLOW + fHIGH
)
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[
[ ]
[#]
941 + 1336 Hz
697 + 1209 Hz
697 + 1336 Hz
697 + 1477 Hz
770 + 1209 Hz
770 + 136 Hz
770 + 1477 Hz
852 + 1209 Hz
852 + 1336 Hz
852 + 1477 Hz
941 + 1209 Hz
941 + 1477 Hz
10 pulses
Memory 17
Memory 18
Memory 19
Memory 20
Memory 21
Memory 22
Memory 23
Memory 24
Memory 25
Memory 26
-
1 pulse
pulses
To enter PIN protected programming
Select flash duration
Select dialing mode
Select pause duration
Key lock toggle
3 pulses
4 pulses
5 pulses
6 pulses
Ringer volume
7 pulses
Ringer melody
8 pulses
LCD contrast
9 pulses
Ringer on/off
Temporary MF select
-
-
Revision 2.1
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Datasheet AS2525
austriamicrosystems
Table 3: Parameter settings
Parameter
Symbol
Procedure:
[PG] + [0] + (Password) +
Default
Options
Inter-Digit Pause (LD)
MF Tone Duration
MF Inter-Tone Pause
Flash 1 Duration
IDP
840 ms
1.72 ms … 7.03 sec. (see Table 4)
1.72 ms … 7.03 sec. (see Table 4)
1.72 ms … 7.03 sec. (see Table 4)
1.72 ms … 7.03 sec. (see Table 4)
1.72 ms … 7.03 sec. (see Table 4)
1.72 ms … 7.03 sec. (see Tabl)
1.72 ms … 7.03 sec. (see Table 4)
1.72 ms … 7.03 sec. (see Table 4)
1.72 ms … 7.03 sec. (see Table 4)
30 to 4dB (see Table 8)
[ ] + [1] + [HEX code]
[ ] + [2] + [HEX code]
[ ] + [3] + [HEX code]
[ ] + [4] + [HEX code]
[ ] + [5] + [HEX code]
[ ] + [6] + [HEX code]
[ ] + [7] + [HEX code]
[ ] + [8] + [HEX code]
[ ] + [9] + [HEX code]
[0] + [1] + [HEX code]
[0] + [2] + [HEX code]
[0] + [3] + [HEX
[0] + [4] + [HEX co]
[0] + [5] +
TD
82 ms
ITP
82 ms
FL1
101 ms
285 ms
1 second
3 seconds
33 ms
Flash 2 Duration
FL2
Pause 1 Duration
P1
Pause 2 Duration
P2
Pre-Digit Pause (LD)
Post Flash Pause
Tx Gain, Handset
PDP
PFP
ATX-HS
ARX-HS
ATX-HF
ARX-HS
LLC
274 ms
37 dB
Rx Gain, Handset
Tx Gain, Handsfree
Rx Gain, Loudspeaker
Line Loss Compensation
1 dB
-to 9 dB (see Table 12)
46 dB
39 to 54 dB (see Table 10)
29 dB
22 to 37 dB (see Table 14)
[0] = of
[1] = range 1: ILINE = 20 - 50 mA
[2] = range 2: ILINE = 45 - 75 mA
DTMF Level (Low Group)
VMF
[0] + [6] + [HEX code]
-6 dBm
-18 to -6 dBm in 1 dB steps
(see Table 24)
Tx Gain, Headset
Rx Gain, Headset
MF Comfort Tone, RO
ATX-HEAD
ARX-HEAD
[0] + [7] + [HEX code]
[0] + [8] + [HE]
37 dB
1 dB
30 to 45 dB (see Table 20)
-6 to 9 dB (see Table 21)
VMF-CT/RO [0] + [9] [HEcode]
-30 dBr
-36 to -18 dBr in 6 dB steps
(see Table 30)
MF Comfort Tone, LO1/2
VMF-CT/LO [0] + [0] + [HEX code]
-9 dBr
-15 to 3 dBr in 6 dB steps
(see Table 30)
Make/Break Ratio (LD)
Dial Rate (LD)
M/B
DR
VLI
[#] + [1] +
[#] + [2] +
[#] + [3] +
[#] + [4] +
[1] = 2 : 3
[0] = 10 pps
[1] = 4.5 Volt
[1] = on
[0] = 1 : 2
[1] = 20 pps
[0] = 3.5 Volt
[0] = off
DC Mask (LI Voltage)
Tx Soft Clip (Handset)
(2 VPEAK
)
Rx Soft Cl(Hadset)
[#] + [5] +
[1] = on
(1 VPEAK
[0] = off
)
Noise onitoring (HF)
Lodhearing Mode
Ringer Melody
[#] + [6] +
[#] + [7] +
[#] + [8] +
[#] + [9] +
[#] + [0] +
[1] = on
[0] = off
[1] = HF only
[1] = 3-Tone
[1] = on
[0] = LH and HF modes available
[0] = 2-Tone
Key-in Tone (Beep)
Reset PIN Code
KT
[0] = off
[1] = 1111
Selected by user
Revision 2.1
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Datasheet AS2525
austriamicrosystems
Parameter
Symbol
Procedure:
[PG] + [0] + (Password) +
Default
Options
Flash 1 During LD
[1] = on
[0] = off
[#] + [ ] +
[#] + [#] +
[9] + [1] +
[9] + [2] +
[9] + [3] +
[9] + [4] +
[9] + [5] +
Flash 2 During LD
[0] = off
[0] = off
[1] = on
[1] = on
[1] = x 2
[1] = on
Extended LCD Symbols
Tx Soft Clip, Handsfree
Rx Soft Clip, Handsfree
Voice Switching, Speed
Handset/Headset Volume
[1] = on
[0] = off
[0] = off
[0]=x1 (slow); [2]=x4; [3]=x8 (fast)
[0] = setting is maintained
[1] = reset by
on/off-hook
LCD Test
[9] + [6]
Turns on all segments, pressing any furthekey turns
on all digits “1” and all symbols off.
Temporary MF by * with
tone
[9] + [7] +
[9] + [8] +
[0] = off
[1] = on
Key Lock Function
[] =
[0] = not available
aailable
Pin Select “DM/HM”
Ringer Off Function
DM/HM
[9] + [9] +
[9] + [0] +
[1] = MF/LD
[0] = Handset/Headset
[0] = not available
[1] =
availale
Key Test
key pressure turns the LED on
[1] = enabled [0] = disabled
[9] + [ ] +
[9] + [#] +
Volume Control on
Handset
The above parameters are programmausing a passwor
(0123) through external EEPROM. All procedures must b
terminated by pressing the [PG] key. Software for fctory
settings is available on request.
Data = 4096 - (fOSC / (512 * 12) * T
(T = Time; fOSC = 3.58 MHz)
Table 4: Timing selection by HEX code
The programming of timings is done by usig a HEX data
code as follows:
Parameter
Inter-digit pause
Tone duration
Inter-tone pause
Flash 1
Default
840 ms
82 ms
82 ms
101 ms
285 ms
1 sec
HEX
E17
FD0
FD0
FC4
F5A
Binary Data
1111 0001 0111
1111 1101 0000
1111 1101 0000
1111 1100 0100
1111 0101 1010
C1
C2
C3
C4
R1
R2
1
2
3
4
5
6
7
8
9
0
Flash 2
R3
Pause 1
DB9 1101 1011 1001
92C 1001 0010 1100
FED 1111 1110 1101
Pause 2
3 sec
A (M1) B (M2) C (M3) D (M4)
E (M5) F (M6)
Pre-digit pause
Post-flash pause
33 ms
274
F60
1111 0110 0000
Figure 2: Keys for HEX-code entry
Revision 2.1
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Datasheet AS2525
austriamicrosystems
Table 5: User programming with PIN code
Function
Symbol
CR1
Procedure
Options
Call Restriction 1
Call Restriction 2
Key Lock
Key in two digits, use [MT] for blank
Key in two digits, use [MT] for blank
[0] = unlocked and [1] = locked
Press [1] to clear
[PG] + [1] + (PIN) + [ ] + [1] +
[PG] + [1] + (PIN) + [ ] + [2] +
[PG] + [1] + (PIN) + [#] + [6] +
[PG] + [1] + (PIN) + [#] + [7] +
[PG] + [1] + (PIN) + [#] + [8] +
CR2
Clear All Memories
Reset To Factory
Settings
Press [1] to reset
Change PIN Code
PIN
[PG] + [1] + (PIN) + [0] +
Key in new PIN + new PIN
Press [PG] to store setting and terminate procedure
Table 6: Mode programming
Function
Symbol
Procedure
Options
Select Flash
FL
DM
P
[PG] + [2] +
[PG] + [3] +
[PG] + [4] +
[PG] + [5] + [3]
[PG] + [6] +
[PG] + [7] +
[PG] + [8] +
[PG] + [9] +
[0] = Flash 1 and [1] = Flash 2
[0] = LD (pulse) and [1] = MF (DTMF)
[0] = Pause 1 and [] = Puse 2
Toggles between locked and unlocked
[1] = -16 dB, [2] = -7 dB, and [3] = 0 dB (maximum)
[0], [1], 2], [3], or [4]
Select Dialing Mode1
Select Pause Time
Easy Key Lock2
Ringer Volume
Ringer Melody
LCD Contrast
V33
[2], or [3] (see also AS2591 data sheet)
[0] = Off and [1] = On
Bell On/Off
Press [PG] to store settig and terminate procedure
1
Only when DM/HM pin is set to HM
Also selectable with jumper (see application note AN525)
2
Revision 2.1
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Datasheet AS2525
austriamicrosystems
Memory Allocation
The EEPROM memory consists of three areas:
A = factory settings; B = user settings; C = stored numbers
EEPROM
Set-up programming
A) factory settings
programmed in factory
"reset to factory settings"
B) user settings
User-code programming
C) stored numbers
…write/read by AS2525
Figure 3: Memory allocation for external EEPROM
The AS2525 is writing and reading to and from area B and
C during normal operation and user-code programming.
Area A is protected during normal operation and contains a
back-up copy of the factory settings. This back-up copy
can be loaded into area B by the user with the user-code
programming procedure "reset to factory settings". The
only way to change the factory settings in area A is by set-
up programming using password. After changing area A y
set-up programming, the AS2525 automaticaly performs a
"reset to factory settings" to load this changes also into
area B.
VLine
8
(V)
6
VLS
VLI
4
0
0
20
40
ILine
60
80
100
(mA)
Figure 4: DC characteristic with low dc mask
2/4 Wire Conversion
Functional Description
AS2525 has a built-in dual Wheatstone bridge with one
common ground. This provides a maximum of
independence of ac impedance and side-tone from each
other. One can adapt side-tone without changing the ac
impedance.
DC Conditions
The normal operating mode is from 15 mA to 100 mA. An
operating mode with reduced performance from 5 mA to
15 mA. In the line-hold range from 0 mA tmA the device
is in a power down mode.
AC Impedance
The ac impedance of AS2525 is set to 1000 Ω. A complex
impedance can be adjusted by connecting an external
capacitor to the CI pin. With an external resistor of
approximately 1.5 kΩ connected to the LS pin, it can be
programmed to 600 Ω.
The dc characteristic is determined by the voltage at LI pin
and a 30 Ω resistor between pin LI and LS. It can be
calculated by the fllowing equation:
VLS = VLI + ILINE * 30 Ω
ZAC(syn) = 33 30 Ω
VLI cae programmed to be 3.5 V or 4.5 V.
Tale 7: DC mask selection
[PG] + [0] + (Password) + [#] + [3] + (digit) + [PG]
Digit
[0]
[1]
DC Mask (dc voltage at pin LI)
Low dc mask, VLI = 3.5 Volt
High dc mask, VLI = 4.5 Volt
Revision 2.1
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Datasheet AS2525
austriamicrosystems
Table 10: Handsfree Tx gain setting
[PG] + [0] + (Password) + [0] + [3] + (x) + [PG]
Side-Tone
A good side-tone cancellation can be achieved by using
the following equation:
Key
Tx Gain (dB)
Key
Tx Gain (dB)
(x)
M3/4 to LS
(x)
M3/4 to LS
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
39
40
41
42
43
44
45
46
[8]
[9]
47
48
49
50
51
52
53
5
Z
BAL/ZLINE = 10
[M1]
[M2]
[M3]
[M4]
[M5]
[M6]
This is assuming that the side-tone reference resistor, R2
(between LI and STB) is 300 Ω and R1 is 30 Ω.
R1 = 30 ohm
ZLINE
The input is differential with an impedance of 0 k
ZBAL
R2 = 300 ohm
The soft clip circuit limits the output voltage swing at pin
LS to 2 VPEAK when activated.
Figure 5: Side-tone balance
Table 11: Handsfree Tx solipping selection
Transmit Path
The gain of the M1/M2 —> LS path is default set to 37 dB.
This gain can be changed from 30 dB to 45 dB in 1 dB
steps by set-up programming.
[G] + [0] + (Password) + [9] + [2] + (digit) + [PG]
Digit
[0]
Handsfree Tx Soft Clipping
Dbled
[1]
Enabled (2 VPEAK)
Table 8: Handset Tx gain setting
There is nLLC option for this path.
[PG] + [0] + (Password) + [0] + [1] + (x) + PG]
Recve Path
Key
Tx Gain (dB)
Key
x Gain (dB)
(x)
M1/2 to LS
(x)
M1/2 to LS
The gain of the LS —> RO receive path is default set to 1
dB. This gain can be changed from -6 dB to 9 dB in 1 dB
steps by set-up programming.
[0]
[1]
[2)
[3]
[4]
[5]
[6]
[7]
30
31
32
33
34
35
36
37
[8]
9]
38
39
40
41
2
43
44
45
[M
[M2]
[M3]
[M4]
[M5]
[M6
Table 12: Handset Rx gain setting
[PG] + [0] + (Password) + [0] + [2] + (x) + [PG]
Key
Rx Gain (dB)
Key
Rx Gain (dB)
(x)
LS to RO
(x)
LS to RO
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
-6
-5
-4
-3
-2
-1
0
[8]
[9]
2
3
4
5
6
7
8
9
The input is differential with an impedance of 10 kΩ. The
soft clip circuit limits the output votage swing at pin LS to
2 VPEAK when activated.
[M1]
[M2]
[M3]
[M4]
[M5]
[M6]
Table 9: Handset Tx soft cipping selection
[PG] + [0] + (assword) + [#] + [4] + (digit) + [PG]
1
Digit
[0]
[1
Handset Tx Soft Clipping
isabled
Enabled (2 VPEAK)
When the handset volume control is enabled (see Table 3:
Parameter settings), the user can also change the gain
within this range in 4 dB steps via the [V+]/[V-] keys. The
default receive gain in handset and headset mode must lie
between position 5 and 9 for correct operation of the
volume control. The receive input is the differential signal
of RI and STB. The soft clip circuit limits the output voltage
at RO to 1 VPEAK. It prevents harsh distortion and acoustic
shock.
Tere is optional LLC for this path.
The gain of the M3/M4 —> LS path is default set to 46 dB.
This gain can be changed from 39 dB to 54 dB in 1 dB
steps by set-up programming.
Revision 2.1
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Datasheet AS2525
austriamicrosystems
Table 13: Handset Rx soft clipping selection
Table 16: Line loss compensation selection
[PG] + [0] + (Password) + [0] + [5] + (digit) + [PG]
[PG] + [0] + (Password) + [#] + [5] + (digit) + [PG]
Digit
[0]
[1]
Handset Rx Soft Clipping (Earpiece)
Disabled
Enabled
Digit
[0]
[1]
LLC Range
No LLC (gain independent of line current)
-1 dB/5 mA from 20 to 50 mA
-1 dB/5 mA from 45 to 75 mA
[2]
There is LLC option for this path.
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.
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.
Handsfree
The handsfree function allows voice communiatiothout
using the handset (full 2-way speaker phone). wo voice
controlled attenuators prevent acoustic coupling between
the loudspeaker and the handsfree microphone.
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
The voice switching circuit hs three states, namely idle,
transit or receive. In receive mode the attenuation of the
receive path and the tansmt path can be controlled by the
volume keys between 0 dB and -20 dB. The following table
(Table 18: Handfree attenuation scheme) shows how
voice switching is controlled.
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
22
23
24
25
26
27
28
29
[8]
[9]
30
31
32
33
34
35
6
37
[M1]
[M2]
[M3]
[M4]
[M5]
[M6]
vitchincircuit
The user can also change the gain using the [V+]/[V-] keys
(see section "Handsfree"). The volume rane is 20 dB (8
steps, each 2.5 dB).
TX_atten
Voice
Backgnd
noise
speech
switching
RX
monitor
The receive input is the differential signal of RI and STB.
The soft clip circuit limits the output voltage swing t
LO1/LO2 to 1 VPEAK
.
Table 15: Loudspeaker soft clipping selectn
Figure 6: Handsfree voice switching
[PG] + [0] + (Password) + [9] + [3] + igit) + [PG]
Digit
[0]
[1]
Handsfree Rx Soft Cppin(Loudspeaker)
Disabled
Enabled
A background monitoring circuit is incorporated. This
circuit can be enabled/disabled as required.
Table 17: Background noise monitoring selection
There is optional LLC for this path.
[PG] + [0] + (Password) + [#] + [6] + (digit) + [PG]
Line Loss Compensation (LLC)
The line loss comensation is set-up programmable and
effects y the handset mode.
Digit
[0]
Background Noise Monitoring
Disabled
Enabled
[1]
Revision 2.1
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Datasheet AS2525
austriamicrosystems
Gmax = +9dB
LINE
Gmin = -21dB … -40dB (VOL)
+23dB
+14dB
+8dB
Offset
comp
Compress
Compress
Peak
detector
speech
+3dB
Voice
Peak
detector
Compress
Offset
comp
FT2
switching
CTXoffset
RO
FT1
CBN
Cmicoffset
Offset
comp
Peak
CBckgnd
detector
RECV
RECI
Gmax = -4dB … +16dB (VOL)
Gmin = -33dB
+12dB
Figure 7: Signal path of handsfree circuit
Table 18: Handsfree attenuation scheme
Speech
X
Mode
Receive
Idle
RX-gain
0 dB to -20 dB
-25 d
TX-gain
-50 dB to -30 dB
-2
Remark
RX > TX_atten
TX_atten > RX
TX_atten > RX
adjustable with [V+]/[V-] keys in 8 steps
middle position
No
Yes
Transmit
-50 dB
0 dB
independent of [V+]/[V-] keys
IDLE-mode
RX-mode
TX-mode
0dB
-10dB
TX-gain
-20dB
-25dB
Vol max
Vdefault
Vol min
-30dB
RX-gain
-40dB
-50dB
Figure 8: Gain transition of voice switching
Revision 2.1
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Datasheet AS2525
austriamicrosystems
If this mode is entered both hook inputs HS and HF act as
electronic off-hook for handset operation. The gain in
transmit and receive can be programmed by service code
programming. The pin "HEAD" is only scanned once after
off-hook and any change on this pin during one session will
be ignored.
Loudhearing
A loudhearing mode can be enabled/disabled through the
set-up programming.
Table 19: Loudhearing mode selection
[PG] + [0] + (Password) + [#] + [7] + (digit) + [PG]
Digit
[0]
[1]
Loudhearing
Enabled (LH + HF provided)
Disabled (only HF is provided)
Ring Frequency Detection
The ring frequency detector assures that only signals with
a frequency between 13 Hz and 70 Hz are regarded as
valid ring signals.
Headset mode
Head set mode is selected by connecting pin "HEAD" to
VDD and enabling the head function by service code
programming (see also Table 3: Parameter settings).
When a valid ring signal is present for 100 ms
continuously, the melody generator is activated and
remains active as long as the ring signal is present.
Table 20: Headset Tx gain setting
Once the melody generator has been started, the ring
signal is continuously monored and the melody generator
is insantly turned on or off according to the momentary
presence of a valid or nvaliring signal respectively (until
next POR or off-hook).
[PG] + [0] + (Password) + [0] + [7] + (x) + [PG]
Key
Tx Gain (dB)
Key
Tx Gain (dB)
(x)
M1/2 to LS
(x)
M1/2 to LS
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
30
31
32
33
34
35
36
37
[8]
[9]
38
39
40
1
42
43
44
45
[M1]
[M2]
[M3]
[M4]
[M5]
[M6
DC/DC converter
When valid ring signal is detected, the dc/dc converter is
star.
Table 21: Headset Rx gain setting
[PG] + [0] + (Password) + [0] + [8] + (x) + [G]
Key
Rx Gain (dB)
Key
Rx Gain (dB)
(x)
LS to RO
(x)
LS to RO
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
-6
-5
-4
-3
-2
-1
0
[8]
[9]
2
3
4
5
6
7
8
9
[M1
[M2]
[M3]
[M4]
[M5]
[M6]
1
Revision 2.1
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Datasheet AS2525
austriamicrosystems
Example 1:
Dialing and Control Functions
Prohibit all calls with numbers starting with 0.
Activate: [PG] + [1] + (PIN) + [1] + [0] + [PG]
Deactivate: [PG] + [1] + (PIN) + [1] + [MT] + [PG]
Valid Keys
The key scanning is enabled in off-hook mode with VDD
above VREF. A valid key is detected from the keyboard by
connecting the appropriate row to the column (RON < 1
kΩ). This can be done using an n x m keyboard matrix with
single contacts. Three diodes and a resistor are used to
extend the number of rows (see Figure 1: Keyboard
Layout).
Example 2:
Prohibit all calls with numbers starting with 09 (numbers
starting with 00…, 01…, etc. will be allowed; pauses will e
ignored, i.e. numbers starting with 0 PS 9 … will be
prohibited).
PIN Code
A PIN code is available for protecting various user
settings. The default PIN code is set to 1111 and can be
change as follows:
Activate: [PG] + [1] + (PIN) + [1] + [0] + [PG] + PG] + [2] +
(PIN) + [1] + [9] + [PG]
1. Press [PG] to enter program mode
Deactivate: [PG] + [1] + (PIN) + [1] + [MT] + [PG] + [PG] +
[2] + (PIN) + [1] + [MT] + [PG]
2. Press [1] + (PIN) + [0]
3. Key in new PIN code (valid digits: 0 - 9, #)
4. Key in new PIN code again
Pressing the [MT] key n place of the digit during
programming will cancel said call restriction. The first and
second digit cabe stored, changed or deleted
independent of each other.
5. Press [PG] (= store and exit) or go on-hook to
abort
Key Lock
It is also possible to reset the PIN code through set-up
programming:
A keocfunction is provided to allow the user to protect
the telephone from any misuse. When this function is
available through the set-up programming, it is possible to
enable/disable the key lock using the user PIN code.
1. Press [PG] to enter program moe
2. Press [0] + (Password) + [#] [0]
3. Press [1] to reset
Enabling/disabling key lock:
4. Press [PG] (= store and exit) or go on-hok to
1. Press [PG] to enter program mode
abort
2. Press [1] +(PIN) + [#] + [6]
Call Restriction
3. Press [1] for enable or [0] for disable
A call restriction function is accommodatehis function
can be activated using the PIN coe. One or two digits can
be programmed to inhibit dialing starting with said digit(s).
If first digit(s) of a manual entered number or a number
retrieved from a memory matches the content of the call
restriction memory, dialing will be inhibited.
4. Press [PG] (= store and exit) or go on-hook to
abort
Also an easy key lock function is provided. This function
can be activated/deactivated when the key lock function is
available through set-up programming and the previous
mentioned key lock through PIN code is disabled.
Storing digitfor call restriction:
1. Press [PG] to enter program mode
Clear Memory Procedure
It is possible to clear all stored numbers by using the PIN
code as follows:
2. Press [1] + (PIN) + [ ]
3. Press [1] for entering first digit of call restriction
or [2] for entering second digit
1. Press [PG] to enter program mode
2. Press [1] + (PIN) + [#] + [7]
3. Press [1] for clear
4. Key in digit for call restriction
5. Press [PG] (= store and exit) or go on-hook to
abort.
Revision 2.1
Page 14 of 27
Datasheet AS2525
austriamicrosystems
4. Press [PG] (= store and exit) or go on-hook to
Flash Function
abort
A flash, [FL] key, activation will invoke a timed loop break.
The flash duration can be programmed through set-up (see
Figure 2: Keys for HEX-code entry and Table 4: Timing
selection by HEX code):
Reset to Factory Settings
It is possible to reset all settings to the default factory
settings with following procedure:
Table 22: Flash duration setting
1. Press [PG] to enter program mode
2. Press [1] + (PIN) + [#] + [8]
3. Press [1] for reset
[PG] + [0] + (Password) + [ ] + (digit) + (HEX) + [PG]
Digit
[4]
[5]
Timing
HEX code
HEX code
Flash Duration
Flash 1
Flash 2
4. Press [PG] (= store and exit) or go on-hook to
abort
One of two pre-programmed can be selected as foll:
1. Press [PG] to enter program mode
Dial Mode Selection
The default signaling mode (LD or MF) is selectable
through following procedure:
2. Press [2] to enter flash select mode
3. Press [0] for duration 1 and [1] for duration 2
1. Press [PG] to enter program mode
2. Press [3] to enter dial select mode
3. Press [0] for LD and [1] for MF
4. Press [PG] (= se and exit) or go on-hook to
abort
A flash entered will be storein the LNR memory together
with entered dgs. After a recall a 270 ms pause will
automatically be executed.
4. Press [PG] (= store and exit) or go on-hook to
abort
Pauses
When default LD mode is selected, a temporary change
MF can be invoked by pressing the [ ] key. Tmporary MF
select with tone on first key pressure can e selected as
option (see also Table 3: Parameter settings). The circuit
will revert to LD by pressing the [FL] kor by next on-
hook.
Paucan be inserted if the [R/P] key is pressed after
etering one or more digits. Also during programming,
pauses can be inserted by pressing the [R/P] key. Default
pause duration is 1 second (P1) and an alternative pause
of 3 second (P2) can be selected. These pauses can be
changed through the set-up programming (see Table 3:
Parameter settings)
Re-Dialing (Last Number Redial)
Re-dialing is a facility that allows re-signaling of the last
dialed number without keying in all the digits again.
Numbers dialed out from any memory wll o be stored in
the LNR memory. The re-dialing works in owing manner:
Memory Keys
The keys [M1] to [M8] are direct memory access keys,
[SH] key is used to access second level of direct
memories, and the [MR] key is used for key-code dialing.
Up to 26 numbers can be stored in the on-chip RAM. Each
number can contain up to 21 digits (including pauses).
During programming multiple pauses can be inserted by
pressing the [RD] key.
-
Any digit (including Flash, Paue, ad MF select) being
dialed is storable in the LNR memory up to a total of 31
digits.
-
-
If more than 31 digits are entered, re-dialing will be
inhibited.
Example (45678P123 is stored in M1, where P is a pause
and 123 the extension number):
Pressing he [/P] key as first entry after off-hook
(LNursor at first digit) will invoke dialing the content
of tLNR memory.
1. Off-hook, wait for dial tone
2. Press [M1]
-
-
-
45678 is dialed out
-
f the [R/P] key is pressed after entering one or more
digits, the key will function as a pause key and each
pressure will insert a pause.
Dialing halts (pauses)
Dialing is resumed, 123 is dialed out.
Memory dialing is cascadable up to a the maximum of 31
digits/data.
Pauses can also be inserted by pressing the [R/P] key in
program mode.
Revision 2.1
Page 15 of 27
Datasheet AS2525
austriamicrosystems
The pre-emphasis is 2.6 dB. The DTMF tones are
Memory Storing Procedure
according to CEPT recommendations.
Up to 28 numbers, each with maximum 24 digits, can be
stored into the external EEPROM. The store procedure is
as follows:
Tone Ringer (Melody/Volume)
The tone ringer incorporates two basic selection, namely 2-
tone or 3-tone melodies. The default set-up selection is the
3-tone ringer.
1. Press [PG] to enter program mode
2. Enter location (MR + digit3 ; M1 to 8; or
SH + M1 to 8)
3. Enter number
Table 25: Basic ringer melody selection
4. Press [PG] to store and exit or go on-hook to abort
5. Go to 1 for storing further numbers
[PG] + [0] + (Password) + [#] + [8] + (digit) + [PG]
Digit
[0]
[1]
Ringer Melody
2-tone
3-tone
[Mute] starts and stops security storing
(LCD-Symbols [ and ])
The user can chose the following melodies as hown in
below table.
[R/P]
inserts a pause (LCD-Symbol P)
Tone Generator
Table 26: 3-tone melody programming
The tone generator incorporates the DTMF tones, 3
frequencies for the tone ringer and pacifier tones.
Procedure
[PG+ [7] +
Digit
Sequence
Rate
1
2
4
6
[0]
[1]
[2]
[3)
[4]
F1 F2 F3 F1 F2 F3
FF2 F3 F1 F2 F3
F1 F2 F3 F1 F2 F3
F1 F2 F3 F1 F2 F3
F1 F2 F3 F1 F2 F3
DTMF
The DTMF generator provides 7 frequencies.
10
Table 23: DTMF frequencies
Press [PG] to store and terminate
Digit
Frequency
The sen melody will be heard in the loudspeaker during
rogrmming. Pressing the [PG] key will end the procedure
and the last selected melody will be stored.
Rows
1 - 2 - 3
Low roup
97 Hz
4 - 5 - 6
7 - 8 - 9
- 0 - #
77Hz
852 Hz
941 Hz
When 2-tone melody is selected through the set-up
procedure, it is possible to chose the following melodies:
Columns
1 - 4 - 7 -
2 - 5 - 8 - 0
3 - 6 - 9 - #
High Group
1209 Hz
1336 Hz
1477 Hz
Table 27: 2-tone melody programming
Procedure
Digit
Sequence
Rate
[PG] + [7] +
[0]
[1]
[2]
[3)
[4]
F1 F2 F1 F2 F1 F2
F1 F2 F1 F2 F1 F2
F1 F3 F1 F3 F1 F3
F1 F3 F1 F3 F1 F3
F2 F3 F2 F3 F2 F3
2
5
2
5
2
The MF output level can be set through sp program-
ming. The range is from -18 dBm o -6 dBm in 1 dB steps.
Table 24: DTMF level settings
Press [PG] to store and terminate
[PG] + [0] + (Password) + [0] + [6] + (x) + [PG]
Repetition rate means that a sequence of 6 frequencies is
repeated 1, 2, 4, 5, 6 or 10 times within 1 second.
Key
Leel (dBm)
Key
Level (dBm)
(x)
Low Group
(x)
Low Group
[0]
[1]
[2]
[3]
[4]
[5]
[6]
-18
-17
-16
-15
-14
-13
-12
[7]
[8]
[9]
[M1]
[M2]
[M3]
-11
-10
-9
-8
-7
Pacifier Tone
Any key entry is acknowledged by a pacifier tone (key-in
tone) of 1333 Hz. The pacifier tone can be
enabled/disabled through set-up programming.
-6
3
Digit includes 0 – 9, and #
Revision 2.1
Page 16 of 27
Datasheet AS2525
austriamicrosystems
Table 28: Pacifier tone selection
Serial Bus
[PG] + [0] + (Password) + [#] + [9] + (digit) + [PG]
The AS2525 incorporates a microwire™ compatible serial
bus (DO, DI, and CLK) with two chip select outputs (CS1
and CS2). The serial bus is used to:
Digit
[0]
Pacifier Tone (Key-in Tone)
Disabled
[1]
Enabled
-
sending data to the LCD driver (AS2591) when a key is
pressed or a number is dialed out
Table 29: Pacifier tones
-
reading and writing to the external EEPROM under
following conditions:
Key Entry
Frequency
Duration
Acknowledge
Reject/Terminate
1333 Hz
1333 Hz
40 ms
4 x 40 ms
Table 31: EEPROM read/write timings
An invalid key entry will be indicated by a rejection tone of
4 times 40 ms.
ACTION
DURATN
50
0 ms
10 ms
12…600 ms
20 ms
After off-hook (debounced)
After on-hook (debounced)
After first rising edge at FCI
After PG is terminated
By MF dialing the DTMF tones are provided to the earpiece
as comfort tone. The level of the comfort is selected
through the set-up programming.
After pressing [V+]/[V-]
See also AS2591 data sheet or further information.
Table 30: DTMF comfort tone level setting
[PG] + [0] + (Password) + [0] + (y + x) + [PG]
LCD Control
The AS2525 is signed to work together with the LCD
driver AS2591 (see also AS2591 data sheet).
Key
Level (dBr)
Key
Level (dBr)
(y + x)
Earpiece
(y + x)
Loudspeaker
[9] + [0]
[9] + [1]
[9] + [2]
[9] + [3]
-36
-30
-24
-18
[0] + [0]
[0] + [1]
[0] + [2]
[0] + [3]
-15
9
-3
3
Revision 2.1
Page 17 of 27
Datasheet AS2525
austriamicrosystems
Electrical Characteristics
Absolute maximum ratings
-0.3 ≤ VDD ≤ 7V
Positive Supply Voltage
Input Current
+/- 25 mA
-0.3V ≤ VIN ≤ 12V
Input Voltage (LS)
-0.3V ≤ VIN ≤ 8V
-2V ≤ VIN ≤ VDD +0.3V
-0.3V ≤ VIN ≤ VD0.3V
Input Voltage (LI, CS)
Input Voltage (STB, RI)
Digital Input Voltage
Electrostatic Discharge
Storage Temperature Range
Total Power Dissipation
+/- 1000V
-65 to +125°C
500mW
* Exceeding these figures may cause permanent damage. Functional operation under these conions is not permitted.
Recommended Operating Range
Min.
3.0
Typ.*
Max.
5.0
Units
Symbol
Parameter
Conditions
Speech mode
VDD
Supply Voltage (internally generated)
V
TAMB
fOSC
Ambient Operating Temp. Range
Oscillator Frequency
-25
+70
°C
Resonator: Murata CSA 3.58M
G312AM
3.58
MHz
* Typical figures are at 25°C and are fesign aid only; nuaranteed and not subject to production testing.
DC Characteristics
(ILINE = 15 mA, recommended operating conditions unless otherwise specified)
Min.
Typ.
Max.
Units
Symbol
Parameter
Conditions
peech mode
IDD
Operating Supply Current
4
6
mA
mA
µA
µA
Handsfree mode
11
13
LD dialing, VDD = 2.5V
Ring mode, VDD = 2.5V
200
300
IDD-EXT
Available Supply Current for Speech mode or MF dialing
Peripheral Circuits
2
mA
Idle mode, VDD = 2 V, TAMB = 25°C
13 mA< ILINE < 100 mA
IDD0
V
Idle urrent
2
µA
Line Voltage, LIVolt = 0
Line Voltage, LIVolt = 1
3.2
4.2
3.5
4.5
1
3.8
4.8
V
V
IOL
Output Current, Sink
Pin CS, SS
VOL = 0.4V
mA
VIL
VIH
Input Low Voltage
Input High Voltage
TAMB = 25°C
TAMB = 25°C
VSS
0.3 VDD
VDD
V
V
0.7 VDD
Revision 2.1
Page 18 of 27
Datasheet AS2525
austriamicrosystems
AC Electrical Characteristics
ILINE = 15 mA; f = 800 Hz; ZAC = 1000Ω; recommended operating conditions and default settings unless otherwise specified.
Transmit
Symbol
Parameter
Conditions
M1/M2 to LS
Min.
Typ.
Max.
Units
ATX
Transmit Gain, default
34.3
42.0
35.8
44.0
37.3
46.0
dB
dB
M3/M4 to LS
Variation with Frequency
Distortion
f = 500 Hz to 3.4 kHz
VLS < 0.25 VRMS
+/- 0.8
dB
THD
VAGC
ASCO
tDECAY
tDECAY
ZIN
2
Soft Clip Level
VLS
=
2
V
Soft Clip Overdrive
Attack Time
20
dB
70
µs/6dB
ms/6dB
Decay Time
100
Input Impedance; M1/M2
Input Impedance; M3/M4
10
10
kΩ
kΩ
AMUTE
VNO
Mute Attenuation
Mute activate
60
dB
Noise Output Voltage
TAB = 25°C, handset mode
ATX = 37 dB
-72
dBmp
VIN MAX
Input Voltage Range; M1/M2
and M3/M4
Differential
+/- 1
VPEAK
Line Driver
Symbol
VIN MAX
VTX
Parameter
Test Conditions
Min.
Typ.
+/- 2
+/- 2
Max.
Units
VPEAK
VPEAK
dB
Input Voltage Range; LI
Dynamic Range; LI
Return Loss
RL
18
ZRL = 1000 Ω; TAMB = 25°C
Temperature Variation
0.5
∆ZAC/TEMP
Ω/°C
Revision 2.1
Page 19 of 27
Datasheet AS2525
austriamicrosystems
Receive
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
ARX
Receive Gain, Default
LS to RO; volume reset
-2.0
-0.5
27.0
15
1.0
dB
dB
LS to LO1/LO2; volume max.
8 steps through [V-]/[V+] keys
f = 500 Hz to 3.4 kHz
25.0
29.0
ARX-VOL
∆ARX
THD
Volume Control Range
dB
Variation with Frequency
+/- 0.8
dB
Distortion, RO
VRO = 0.25 VRMS
2
5
%
Distortion, LO1/LO2
Soft Clip Level
VLO1/2 = 0.25 VRMS
%
VAGC
ASCO
tDECAY
tDECAY
VNO
VRO
=
1
K
dB
Soft Clip Overdrive
Attack Time
10
VRI > 0.8 VRMS
70
µs/6dB
ms/6dB
dBmp
dBmp
Decay Time
100
Noise Output Voltage, RO
TAMB = 25°C, ARX = 3 dB
50 Hz.........20 kH
-72
-60
VUFC
Unwanted Frequency
Components
ZIN
Input Impedance, RI
8
kΩ
VPEAK
dB
VIN-MAX RI
AST
Input Voltage Range, RI
Side Tone Cancellation
Input Impedance, STB
+/- 2
VRI < 0.25 VRMS
26
ZIN
80
kΩ
VIN-MAX ST Input Voltage Range, STB
+/- 2
VPEAK
General Timings
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
td
Key Debounce Time
Low/High Debounce
High/Low Debounce
Flash Duration
15
15
ms
ms
tHS-L
tHS-H
tFD
HS Input (going off-hook)
HS Input (going on-hook)
FL 1 (default)
210
ms
100
275
102
300
ms
FL 2 (default)
285
274
1.0
3.0
ms
tPFP
tAP
Post Flash Pause
Accss Pause
ms
P1 (default)
P2 (default)
0.9
1.1
sec.
sec.
Revision 2.1
Page 20 of 27
Datasheet AS2525
austriamicrosystems
DTMF
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
DF
Frequency Deviation
Deviation of ceramic resonator
is not included
1.2
%
VMF
MF Tone Level at LS
(Low Group)
Default
-4.5
-5.5
-18/-6
2.6
-6.5
dBm
dBm
dBr
VMF-RANGE MF Tone Level Range at LS
(Low Group)
13 steps
Pre-emphasis, Low to High
2.0
3.2
∆VL_H
VUFC
Unwanted Frequency
Components
300 Hz....4.3 kHz
4.3 kHz…7 kHz
7 kHz....10 kHz
10 kHz…14 kHz
14 kHz....28.5 kHz
28.5 kHz....40 kHz
-40
-46
-52
-58
-70
-80
Bm
dBm
dBm
dBm
dBm
dBm
tTD
tITP
tTR
Tone Duration, Minimum
Inter Tone Pause, Min.
Tone Rise Time
Default
80
80
82.3
82.3
85
85
5
ms
ms
ms
ms
dBr
Default
From 10% to 0% amplitude
Frm 90% to 10% amplitude
Relative to LS, 4 steps
tTR
Tone Fall Time
5
VCT
Comfort Tone Level, RO
-36
-18
LD Dialing
Symbol
tDR
Parameter
Conditions
Min.
Typ.
Max.
Units
Dialing Rate
Default
Option
Default
Option
Option
Default
Option
Option
9.53
10
20
10.5
pps
pps
ms
ms
ms
ms
ms
ms
ms
ms
t/B
Break Period
Make Period
57
38
61.2
66
63
42
33
tM/
40.8
33
16.5
35
tP
tIDP
Pre-Digit Pause
Inter-Digit Pause
800
880
Revision 2.1
Page 21 of 27
Datasheet AS2525
austriamicrosystems
Tone Ringer
Symbol
Parameter
Frequency 1
Frequency 2
Conditions
Min.
Typ.
Max.
Units
F1
F2
770
800
1067
1333
100
13
830
Hz
Hz
Hz
ms
Hz
Hz
1025
1280
1110
1385
F3
Frequency 3
tDT
Detection Time
Initial
fMIN
fMAX
Min. Detection Frequency
Max. Detection Frequency
12
68
14
75
70
Pacifier Tone
Symbol
Parameter
Tone Output Level, RO
Tone Output Level, LO1/2
Frequency
Conditions
Min.
Typ.
30
Max.
Units
mVP-P
mVP-P
Hz
VPARO
RL = 150
RL = 32
00
1333
40
fPT
Key entry
Key entry
tTBD
Tone Burst Duration
ms
Acknowledgeerminate PG
mode
140
ms
4x40
80
ms
ms
Rejection, invalid key en
tITP
Inter-Tone Pause
Revision 2.1
Page 22 of 27
Datasheet AS2525
austriamicrosystems
Timing Diagrams
LD dialling
MUTE
MASK
DPN
tIDP
tPDP tB
tM
tB
tM
tIDP
tPDP tB
tM
LD dialling with access pause
MUTE
MASK
DPN
tAP
Pause
tIDP
tPDP tB
tM
tB
tM
tIDP
tPDP tB
tM
MF dialling
MUTE
MASK
DPN
TONE
tAP
Pause
tTD
tITP
t
tITP
tTD
tITP
Figure 9: Timing diagrams
Revision 2.1
Page 23 of 27
Datasheet AS2525
austriamicrosystems
Test Circuit
25
18
CM
CI
M1
A
15 n
15 n
15 n
15 n
17
15
1 k
1 k
10
8
LS
RI
10 µ
100 µ
30 ohm
M2
ILINE
600 ohm
11
9
7
STB
M3
300 ohm
1 µ
6 k
UL
10 V
M4
B
14
23
LI
AGND
0 µ
12
13
BC
S
327
ss
3
OSC
3.58 MHz
BC
27
28
21
19
20
SS
327
LO
LO2
RO
32 ohm
26
29
VPP
sSA
22 µ
10 µ
100 n
100 n
10 µ
150 ohm
4
43
RECI
CS1
DO
10 k
42
41
DI
RECV
CLK
10 k
1
5
FT1
FT2
CBN
CS2
DPn
2
3
4
10 µ
6
HF
10 µ
24
HS
32
LED
DM/HM
FCI
C1
30
31
37
38
39
40
22
VDD
22 µ
34
35
36
C2
R1
R2
R3
C3
C4
Figure 10: Test circuit
Revision 2.1
Page 24 of 27
Datasheet AS2525
austriamicrosystems
Typical Application
Figure 11: Typical application
Revision 2.1
Page 25 of 27
Datasheet AS2525
austriamicrosystems
Packaging
Ordering Information
44-in plastic TQFP (suffix Q)
Number
Package
Description
For exact mechanical package dimensions please see
austriamicrosystemsAG packaging information.
AS2525 Q TQFP
plastic thin quad flat package –
44 leads (suffix T)
AS2525 F
DOF
Dice-on-Foil
Marking, Pin-out
Devices sold by austriamicrosystems AG are covered by
the warranty and patent identification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no
warranty, express, statutory, implied, or by description
regarding the information set forth herein or regardig the
freedom of the described devices from patent infrinent.
austriamicrosystems AG reserves the right to cange
specifications and prices at any time and withounotice.
Therefore, prior to designing this product into a system, it
is necessary to check with austriamicrosystems AG for
current information. This product is intended for use in
normal commercial applications. Applications requiring
extened temperature range, unusual environmental
requirements, or high reliablity applications, such as
military, medicife-support or life-sustaining equipment
are specifically not recommended without additional
processinby austriamicrosystems AG for each
CS2
DPn
HF
OSC
LED
FCI
1
39
HS
DM/HM
VSSA
YYWWAAA
AS2525x
Austria
FT1
FT2
M4
LO2
LO1
V
28
6
M2
M3
CPMP
M1
CBN
AGND
17
STB
application.
YY
WW
AAA
year of production
calendar week of production
Copyright
austriamicrosystemsAG assembly ID
revision
Copyright © 1997-2002, austriamicrosystems AG, Schloss
Premstaetten, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered ®. All rights reserved. The material
herein may not be reproduced, adapted, merged,
translated, stored, or used without the prior written consent
of the copyright owner.
X
The information furnished here by austriamicrosystems AG
is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or
any third party for any damages, including but not limited
to personal injury, property damage, loss of profits, loss of
use, interruption of business or indirect, special, incidental
or consequential damages, of any kind, in connection with
or arising out of the furnishing, performance or use of the
technical data herein. No obligation or liability to recipient
or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other
services.
Revision 2.1
Page 26 of 27
Datasheet AS2525
austriamicrosystems
Contact
Headquarters
austriamicrosystems AG
Communications Business Unit
A 8141 Schloss Premstätten, Austria
T. +43 (0) 3136 500 0
F. +43 (0) 3136 525 01
www.austriamicrosystems.com
Sales Offices
USA (east)
Germany
austriamicrosystems USA, Inc.
Suite 400, 8601 Six Forks Road
Raleigh, NC 27615, USA
Phone: +1/919/676 5292
Fax: 1/919/676 5305
austriamicrosystems Germany GmbH
Tegernseer Landstrasse 85
D-81539 München, Germany
Phone: +49/89/693643-0
Fax: +49/89/693643-66
United Kingom
France
austriamicrosystems UK, Ltd.
Coliseum usiness Centre, Watchmoor Park
Camey, Surrey, GU15 3YL, UK
Pho+4/1276/23 3 99
austriamicrosystems France S.a.r.l.
124, Avenue de Paris
F-94300 Vincennes, France
Phone: +33/1/43 74 00 90
Fax: +33/1/43 74 20 98
Fax: +44/1276/29 3 53
Japan
austriamicrosystems AG
Shin Yokohama Daini, Center Bldg. 10F
3-19-5, Shin Yokohama
Kohoku-ku, Yokohama 222-0033, Japan
Phone: +81/45/474 0962
Fax: +81/45/472 9845
Italy
austriamicrosystems Italy S.r.l.
Via Leone Tolstoi, 64
I-20146 Milano, Italy
Phone: +39/0242/36713
Fax: +39/0242/290889
Switzerland
austriamicrosystems Switzerland AG
Rietstrasse 4
CH-8640 Rapperswil, Switerland
Phone: +41/55/220 9000
Fax: +41/55/220 9001
Distributors & Representatives
austriamicrosystems AG is represented by distributors in
the following countries. Please contact your nearest
regional sales office for the distributor address:
Spain, Israel, Korea, Hong-Kong, Taiwan, Malaysia,
Singapore, India, Brazil
USA (wt)
ustriamcrosystems USA, Inc.
Sue 116, 4030 Moorpark Ave,
San Jose, CA 95117, USA
Phone: +1/408/345 1790
Fax: +1/408/345 1795
Application Support
Please contact your local sales office or your distributor.
Revision 2.1
Page 27 of 27
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