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Single-Chip Handsfree Phone CMOS Integrated Circuit
AS2525
Key Features
-
DATA SHEET
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.
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
LS VDD VDD LINE SENSE SUPPLY VREF FT2 AGND AGND NOISE DET. + CS - SS VPP VSS CI 300 RI STB - + PEAK DET. + + AGND PEAK DET. M4 VPP VSS - + VOICE SWITCHING VPP LO1 - M3 VDD M2 CBN FT1 M1 VDD
30
LI
AS2525
LO2 VSSA RECI
ZBAL
HS HF DM/HM DEBOUNCE DTMF MELODY
RECV RO
FCI DPN LED CPU DIALLER DC/DC CONVERTER
KEYSCANNING
OSCILLATOR
DI DO CLK
CS1 CS2
KEYBOARD (C1-4/R1-3)
3.58 MHz
CM
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Datasheet AS2525
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Pin Description
Pin #
1
Symbol
CS2
Type
DO
Description
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) 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 8 9 10 11 12
FT1 FT2 M4 M2 M3 M1 STB CS
AI AI AI AI AI AI AI AO
Analogue input pin for connecting a capacitor for offset cancellation. Analogue input pin for connecting a capacitor for offset cancellation.
Microphone Input 4
Differential input for the handsfree microphone (electret).
Microphone Input 2
Differential input for the handset microphone (electret).
Microphone Input 3
Differential input for the handsfree microphone (electret).
Microphone Input 1
Differential input for the handset microphone (electret).
Side Tone Balance Input
Analogue input for side tone cancellation network.
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 14 15 16
VSS LI RI SS
Supply AI AI AO
Voltage Source Source
Negative Power Supply.
Line Input
Analogue input used for power extraction and line current sensing.
Receive Input
Analogue input for ac-separated receive signal.
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 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
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Pin #
19
Symbol
RECI
Type
AI
Description
RECeive Input
Analogue input for the handsfree receive path. Should be connected to RO via a coupling capacitor.
20 21 22 23 24 25
RECV RO VDD AGND CBN CM
AI AO Supply Supply AI DO
RECeive Voice Switching Input
Analogue input for receive voice switching path.
Receive Output to Handset
Output for driving a dynamic earpiece with an impedance from 150 to 300 .
Voltage Drain Drain
Positive Power Supply.
Analogue Ground
Special ground for the internal amplifiers. Analogue input pin for connecting a capacitor for background noise monitoring.
Converter Make Output
This is an output for controlling the external switching converter. During ringing it converts the ring signal into a 4V supply voltage. Loudspeaker Power Supply High power supply for the output driver stage.
26 27 28 29 30
VPP LO1 LO2 VSSA DM/HM
Supply AO
Loudspeaker Outputs 1/2
Output pins for a 32 ( 25 to 50 ) loudspeaker. Power supply pin for LO1-LO2 output amplifier.
Supply DI
Dial Mode/Headset Mode Switch Input
Digital input 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 off-hook only.
31 32 33 34 35 36 37 38 39 40 41
FCI LED OSC R1 R2 R3 C1 C2 C3 C4 CLK
DI DO
Frequency Comparator Input
This is a Schmitt-trigger input for ring frequency discrimination. Disabled during off-hook.
LED Output
Digital output for connecting 2 mA LED to indicate handsfree mode.
Oscillator Input
Input for ceramic resonator 3.58 MHz. DI/O Keyboard
Rows Columns
(see Figure 1: Keyboard Layout). DI/O Keyboard
(see Figure 1: Keyboard Layout).
DO
Clock
Clock output for 3-wire bus. If signal is not activated, a pull down resistor (100 k) is inserted.
42
DI
DI
Data Input
Data input of 3-wire bus. If signal is not activated, a pull down resistor (100 k) is inserted.
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Datasheet AS2525
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Pin #
43
Symbol
DO
Type
DO
Description
Data Output
Data output of 3-wire bus. A 100 k resistor connected from this pin to VSS enables key locking. If signal is not activated, a pull down resistor (100 k) is inserted.
44
CS1
DO
Chip Select 1
Chip select signal for external EEPROM. If signal is not activated, a pull down resistor (100 k) is inserted.
DI: DO: DI/O:
Digital Input Digital Output Digital Input/Output
AI: AO: AI/O:
Analogue Input Analogue Output Analogue Input/output
Basic Definitions
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). PIN code is default set to 1111 and is used by the user to protect certain user settings (see Table 5: User programming with PIN code). The PIN code can be changed by the user. Default settings are shown in bold. Program procedures are entered with the [PG] key. Pressing any invalid key or going on-hook during programming will abort the program mode and no changes will be stored. Ending a program procedure by pressing the [PG] key will store the changes and exit the program mode.
Keyboard Layout
C1 C2 C3 C4
1 2 3 MR V+ M1 M5
4 5 6 PG VM2 M6
7 8 9 R/P MT M3 M7
0 # FL SH M4 M8
R1 R2 R3
Figure 1: Keyboard Layout Maximum RON for key closure: 1 k Minimum ROFF for open key: 1 M See "Table 1: Key definitions" for description of key functions
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Datasheet AS2525
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Key Definitions and Procedures
Table 1: Key definitions Key [0] - [9], [#], [] [] [PG] Condition Off-hook LD mode Speech mode Program mode Speech mode [MT] Mute state Program mode [R/P] Program state [FL] [V+] [V-] [MR] [M1] - [M8] [SH] Speech mode Speech mode Pause Flash function Volume control Volume control Memory redial key Memory dial Second function (shift) Digits Temporary MF select Enter program state Exit program state Enter mute state Exit mute state Enter blank Redial/Pause Function 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 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 Programming Mode ([PG] + Digit) Memory Location ([MR] + Digit) Memory 17 Memory 18 Memory 19 Memory 20 Memory 21 Memory 22 Memory 23 Memory 24 Memory 25 Memory 26 -
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Datasheet AS2525
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Table 3: Parameter settings Parameter Symbol Procedure: [PG] + [0] + (Password) + [] + [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 code] [0] + [4] + [HEX code] [0] + [5] + [0] + [6] + [HEX code] [0] + [7] + [HEX code] [0] + [8] + [HEX code] [0] + [9] + [HEX code] [0] + [0] + [HEX code] [#] + [1] + [#] + [2] + [#] + [3] + [#] + [4] + [#] + [5] + [#] + [6] + [#] + [7] + [#] + [8] + KT [#] + [9] + [#] + [0] + Default Options
Inter-Digit Pause (LD) MF Tone Duration MF Inter-Tone Pause Flash 1 Duration Flash 2 Duration Pause 1 Duration Pause 2 Duration Pre-Digit Pause (LD) Post Flash Pause Tx Gain, Handset Rx Gain, Handset Tx Gain, Handsfree Rx Gain, Loudspeaker Line Loss Compensation DTMF Level (Low Group) Tx Gain, Headset Rx Gain, Headset MF Comfort Tone, RO MF Comfort Tone, LO1/2 Make/Break Ratio (LD) Dial Rate (LD) DC Mask (LI Voltage) Tx Soft Clip (Handset) Rx Soft Clip (Handset) Noise Monitoring (HF) Loudhearing Mode Ringer Melody Key-in Tone (Beep) Reset PIN Code
IDP TD ITP FL1 FL2 P1 P2 PDP PFP ATX-HS ARX-HS ATX-HF ARX-HS LLC VMF ATX-HEAD ARX-HEAD VMF-CT/RO VMF-CT/LO M/B DR VLI
840 ms 82 ms 82 ms 101 ms 285 ms 1 second 3 seconds 33 ms 274 ms 37 dB 1 dB 46 dB 29 dB [0] = off -6 dBm 37 dB 1 dB -30 dBr -9 dBr [1] = 2 : 3 [0] = 10 pps [1] = 4.5 Volt [1] = on (2 VPEAK) [1] = on (1 VPEAK) [1] = on [1] = HF only [1] = 3-Tone [1] = on [1] = 1111
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 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) 30 to 45 dB (see Table 8) -6 to 9 dB (see Table 12) 39 to 54 dB (see Table 10) 22 to 37 dB (see Table 14) [1] = range 1: ILINE = 20 - 50 mA [2] = range 2: ILINE = 45 - 75 mA -18 to -6 dBm in 1 dB steps (see Table 24) 30 to 45 dB (see Table 20) -6 to 9 dB (see Table 21) -36 to -18 dBr in 6 dB steps (see Table 30) -15 to 3 dBr in 6 dB steps (see Table 30) [0] = 1 : 2 [1] = 20 pps [0] = 3.5 Volt [0] = off [0] = off [0] = off [0] = LH and HF modes available [0] = 2-Tone [0] = off Selected by user
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Datasheet AS2525
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Parameter
Symbol
Procedure: [PG] + [0] + (Password) + [#] + [] + [#] + [#] + [9] + [1] + [9] + [2] + [9] + [3] + [9] + [4] + [9] + [5] + [9] + [6] [9] + [7] + [9] + [8] +
Default
Options
Flash 1 During LD Flash 2 During LD Extended LCD Symbols Tx Soft Clip, Handsfree Rx Soft Clip, Handsfree Voice Switching, Speed Handset/Headset Volume LCD Test Temporary MF by * with tone Key Lock Function Pin Select "DM/HM" Ringer Off Function Key Test Volume Control on Handset DM/HM
[1] = on [0] = off [0] = off [1] = on [1] = on [1] = x 2 [1] = reset by on/off-hook
[0] = off [1] = on [1] = on [0] = off [0] = off [0]=x1 (slow); [2]=x4; [3]=x8 (fast) [0] = setting is maintained
Turns on all segments, pressing any further key turns on all digits "1" and all symbols off. [0] = off [1] = available [1] = MF/LD [1] = available [1] = on [0] = not available [0] = Handset/Headset [0] = not available
[9] + [9] + [9] + [0] + [9] + [] + [9] + [#] +
Any key pressure turns the LED on [1] = enabled [0] = disabled
The above parameters are programmable using a password (0123) through external EEPROM. All procedures must be terminated by pressing the [PG] key. Software for factory settings is available on request. The programming of timings is done by using a HEX data code as follows:
C1 C2 C3 C4
Data = 4096 - (fOSC / (512 * 12) * T (T = Time; fOSC = 3.58 MHz)
Table 4: Timing selection by HEX code Parameter Inter-digit pause Tone duration Default 840 ms 82 ms 82 ms 101 ms 285 ms 1 sec 3 sec 33 ms 274 HEX E17 FD0 FD0 FC4 F5A DB9 92C FED F60 Binary Data 1111 0001 0111 1111 1101 0000 1111 1101 0000 1111 1100 0100 1111 0101 1010 1101 1011 1001 1001 0010 1100 1111 1110 1101 1111 0110 0000
1 2 3
4 5 6
7 8 9
R1
Inter-tone pause Flash 1 Flash 2 Pause 1 Pause 2
0
R2 R3
A (M1) B (M2) C (M3) D (M4) E (M5) F (M6)
Figure 2: Keys for HEX-code entry
Pre-digit pause Post-flash pause
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Datasheet AS2525
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Table 5: User programming with PIN code Function Call Restriction 1 Call Restriction 2 Key Lock Clear All Memories Reset To Factory Settings Change PIN Code PIN Symbol CR1 CR2 Procedure [PG] + [1] + (PIN) + [] + [1] + [PG] + [1] + (PIN) + [] + [2] + [PG] + [1] + (PIN) + [#] + [6] + [PG] + [1] + (PIN) + [#] + [7] + [PG] + [1] + (PIN) + [#] + [8] + [PG] + [1] + (PIN) + [0] + Options 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 Press [1] to reset Key in new PIN + new PIN
Press [PG] to store setting and terminate procedure
Table 6: Mode programming Function Select Flash Select Dialing Mode 1 Select Pause Time Easy Key Lock 2 Ringer Volume Ringer Melody LCD Contrast Bell On/Off V33 Symbol FL DM P Procedure [PG] + [2] + [PG] + [3] + [PG] + [4] + [PG] + [5] + [3] + [9] [PG] + [6] + [PG] + [7] + [PG] + [8] + [PG] + [9] + Options [0] = Flash 1 and [1] = Flash 2 [0] = LD (pulse) and [1] = MF (DTMF) [0] = Pause 1 and [1] = Pause 2 Toggles between locked and unlocked [1] = -16 dB, [2] = -7 dB, and [3] = 0 dB (maximum) [0], [1], [2], [3], or [4] [1], [2], or [3] (see also AS2591 data sheet) [0] = Off and [1] = On
Press [PG] to store setting and terminate procedure
1 2
Only when DM/HM pin is set to HM Also selectable with jumper (see application note AN525)
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Datasheet AS2525
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Memory Allocation
The EEPROM memory consists of three areas: A = factory settings; B = user settings; C = stored numbers
EEPROM
A) factory settings programmed in factory B) user settings C) stored numbers Set-up programming "reset to factory settings" User-code programming
...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 setup programming using password. After changing area A by set-up programming, the AS2525 automatically performs a "reset to factory settings" to load this changes also into area B.
VLine
8
(V)
6
VLS
4
VLI
2
0 0 20 40 60 80
ILine
(mA)
100
Figure 4: DC characteristic with low dc mask
Functional Description
DC Conditions
The normal operating mode is from 15 mA to 100 mA. An operating mode with reduced performance is from 5 mA to 15 mA. In the line-hold range from 0 mA to 5 mA the device is in a power down mode. The dc characteristic is determined by the voltage at LI pin and a 30 resistor between pin LI and LS. It can be calculated by the following equation: VLS = VLI + ILINE * 30 VLI can be programmed to be 3.5 V or 4.5 V. Table 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
2/4 Wire Conversion
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.
AC Impedance
The ac impedance of AS2525 is set to 1000 . A complex impedance can be adjusted by connecting an external capacitor to the CI pin. With an external resistor of approximately 1.5 k connected to the LS pin, it can be programmed to 600 . ZAC(syn) = 33 30
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Datasheet AS2525
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Table 10: Handsfree Tx gain setting [PG] + [0] + (Password) + [0] + [3] + (x) + [PG] Key (x) [0] [1] [2] [3] [4] [5] [6] [7] Tx Gain (dB) M3/4 to LS 39 40 41 42 43 44 45 46 Key (x) [8] [9] [M1] [M2] [M3] [M4] [M5] [M6] Tx Gain (dB) M3/4 to LS 47 48 49 50 51 52 53 54
Side-Tone
A good side-tone cancellation can be achieved by using the following equation: ZBAL/ZLINE = 10 This is assuming that the side-tone reference resistor, R2 (between LI and STB) is 300 and R1 is 30 .
ZLINE
R1 = 30 ohm
The input is differential with an impedance of 10 k.
ZBAL R2 = 300 ohm
The soft clip circuit limits the output voltage swing at pin LS to 2 VPEAK when activated. Table 11: Handsfree Tx soft clipping selection
Figure 5: Side-tone balance
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. Table 8: Handset Tx gain setting [PG] + [0] + (Password) + [0] + [1] + (x) + [PG] Key (x) [0] [1] [2) [3] [4] [5] [6] [7] Tx Gain (dB) M1/2 to LS 30 31 32 33 34 35 36 37 Key (x) [8] [9] [M1] [M2] [M3] [M4] [M5] [M6] Tx Gain (dB) M1/2 to LS 38 39 40 41 42 43 44 45
[PG] + [0] + (Password) + [9] + [2] + (digit) + [PG]
Digit [0] [1] Handsfree Tx Soft Clipping Disabled Enabled (2 VPEAK)
There is no LLC option for this path.
Receive Path
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. Table 12: Handset Rx gain setting [PG] + [0] + (Password) + [0] + [2] + (x) + [PG] Key (x) [0] [1] [2] [3] [4] [5] [6] [7] Rx Gain (dB) LS to RO -6 -5 -4 -3 -2 -1 0 1 Key (x) [8] [9] [M1] [M2] [M3] [M4] [M5] [M6] Rx Gain (dB) LS to RO 2 3 4 5 6 7 8 9
The input is differential with an impedance of 10 k. The soft clip circuit limits the output voltage swing at pin LS to 2 VPEAK when activated. Table 9: Handset Tx soft clipping selection [PG] + [0] + (Password) + [#] + [4] + (digit) + [PG] Digit [0] [1] Handset Tx Soft Clipping Disabled Enabled (2 VPEAK)
There 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.
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.
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Datasheet AS2525
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Table 16: Line loss compensation selection [PG] + [0] + (Password) + [0] + [5] + (digit) + [PG] Digit [0] [1] [2] 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
Table 13: Handset Rx soft clipping selection [PG] + [0] + (Password) + [#] + [5] + (digit) + [PG] Digit [0] [1] Handset Rx Soft Clipping (Earpiece) Disabled 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 (x) [0] [1] [2] [3] [4] [5] [6] [7] Rx Gain (dB) LS to LO1/2 22 23 24 25 26 27 28 29 Key (x) [8] [9] [M1] [M2] [M3] [M4] [M5] [M6] Rx Gain (dB) LS to LO1/2 30 31 32 33 34 35 36 37
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
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 [0] [1] Handsfree Rx Soft Clipping (Loudspeaker) Disabled Enabled
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 [0] [1] Background Noise Monitoring Disabled 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.
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Datasheet AS2525
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Gmax = +9dB Gmin = -21dB ... -40dB (VOL)
LINE +14dB +8dB +3dB
FT2
+23dB
Offset comp
Compress
Peak detector Voice switching
speech Peak detector Compress Offset comp
FT1
CTXoffset
RO
RECV
Offset comp
Compress
Peak detector
CBN
Cmicoffset CBckgnd
RECI
Gmax = -4dB ... +16dB (VOL) Gmin = -33dB
+12dB
Figure 7: Signal path of handsfree circuit
Table 18: Handsfree attenuation scheme Speech RX > TX_atten TX_atten > RX TX_atten > RX X No Yes Mode Receive Idle Transmit RX-gain 0 dB to -20 dB -25 dB -50 dB TX-gain -50 dB to -30 dB -25 dB 0 dB Remark adjustable with [V+]/[V-] keys in 8 steps middle position independent of [V+]/[V-] keys
IDLE-mode RX-mode
0dB
TX-mode
-10dB
TX-gain
-20dB Vol max Vol default Vol min -25dB -30dB
-40dB
RX-gain
-50dB
Figure 8: Gain transition of voice switching
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Datasheet AS2525
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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. 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. Once the melody generator has been started, the ring signal is continuously monitored and the melody generator is instantly turned on or off according to the momentary presence of a valid or invalid ring signal respectively (until next POR or off-hook).
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). Table 20: Headset Tx gain setting [PG] + [0] + (Password) + [0] + [7] + (x) + [PG] Key (x) [0] [1] [2] [3] [4] [5] [6] [7] Tx Gain (dB) M1/2 to LS 30 31 32 33 34 35 36 37 Key (x) [8] [9] [M1] [M2] [M3] [M4] [M5] [M6] Tx Gain (dB) M1/2 to LS 38 39 40 41 42 43 44 45
DC/DC converter
When a valid ring signal is detected, the dc/dc converter is started.
Table 21: Headset Rx gain setting [PG] + [0] + (Password) + [0] + [8] + (x) + [PG] Key (x) [0] [1] [2] [3] [4] [5] [6] [7] Rx Gain (dB) LS to RO -6 -5 -4 -3 -2 -1 0 1 Key (x) [8] [9] [M1] [M2] [M3] [M4] [M5] [M6] Rx Gain (dB) LS to RO 2 3 4 5 6 7 8 9
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Datasheet AS2525
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Example 1: Prohibit all calls with numbers starting with 0. Activate: [PG] + [1] + (PIN) + [1] + [0] + [PG] Deactivate: [PG] + [1] + (PIN) + [1] + [MT] + [PG] Example 2: Prohibit all calls with numbers starting with 09 (numbers starting with 00..., 01..., etc. will be allowed; pauses will be ignored, i.e. numbers starting with 0 PS 9 ... will be prohibited). Activate: [PG] + [1] + (PIN) + [1] + [0] + [PG] + [PG] + [2] + (PIN) + [1] + [9] + [PG] Deactivate: [PG] + [1] + (PIN) + [1] + [MT] + [PG] + [PG] + [2] + (PIN) + [1] + [MT] + [PG] Pressing the [MT] key in place of the digit during programming will cancel said call restriction. The first and second digit can be stored, changed or deleted independent of each other.
Dialing and Control Functions
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 k). 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).
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: 1. Press [PG] to enter program mode 2. Press [1] + (PIN) + [0] 3. Key in new PIN code (valid digits: 0 - 9, #) 4. Key in new PIN code again 5. Press [PG] (= store and exit) or go on-hook to abort It is also possible to reset the PIN code through set-up programming: 1. Press [PG] to enter program mode 2. Press [0] + (Password) + [#] + [0] 3. Press [1] to reset 4. Press [PG] (= store and exit) or go on-hook to abort
Key Lock
A key lock function 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. Enabling/disabling key lock: 1. Press [PG] to enter program mode 2. Press [1] +(PIN) + [#] + [6] 3. Press [1] for enable or [0] for disable 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.
Call Restriction
A call restriction function is accommodated. This function can be activated using the PIN code. 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. Storing digits for call restriction: 1. Press [PG] to enter program mode 2. Press [1] + (PIN) + [] 3. Press [1] for entering first digit of call restriction or [2] for entering second digit 4. Key in digit for call restriction 5. Press [PG] (= store and exit) or go on-hook to abort.
Clear Memory Procedure
It is possible to clear all stored numbers by using the PIN code as follows: 1. Press [PG] to enter program mode 2. Press [1] + (PIN) + [#] + [7] 3. Press [1] for clear
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Datasheet AS2525
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Flash Function
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): Table 22: Flash duration setting [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
Reset to Factory Settings
It is possible to reset all settings to the default factory settings with following procedure: 1. Press [PG] to enter program mode 2. Press [1] + (PIN) + [#] + [8] 3. Press [1] for reset 4. Press [PG] (= store and exit) or go on-hook to abort
One of two pre-programmed can be selected as follows: 1. Press [PG] to enter program mode 2. Press [2] to enter flash select mode 3. Press [0] for duration 1 and [1] for duration 2 4. Press [PG] (= store and exit) or go on-hook to abort A flash entered will be stored in the LNR memory together with entered digits. After a recall a 270 ms pause will automatically be executed.
Dial Mode Selection
The default signaling mode (LD or MF) is selectable through following procedure: 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] (= store and exit) or go on-hook to abort When default LD mode is selected, a temporary change to MF can be invoked by pressing the [] key. Temporary MF select with tone on first key pressure can be selected as option (see also Table 3: Parameter settings). The circuit will revert to LD by pressing the [FL] key or by next onhook.
Pauses
Pauses can be inserted if the [R/P] key is pressed after entering 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 will also be stored in the LNR memory. The re-dialing works in following 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. Example (45678P123 is stored in M1, where P is a pause and 123 the extension number): 1. Off-hook, wait for dial tone 2. Press [M1] 45678 is dialed out - Dialing halts (pauses) - Dialing is resumed, 123 is dialed out.
-
Any digit (including Flash, Pause, and 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. Pressing the [R/P] key as first entry after off-hook (LNR cursor at first digit) will invoke dialing the content of the LNR memory. If 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.
-
-
-
Pauses can also be inserted by pressing the [R/P] key in program mode.
Memory dialing is cascadable up to a the maximum of 31 digits/data.
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The pre-emphasis is 2.6 dB. The DTMF tones are according to CEPT recommendations.
Memory Storing Procedure
Up to 28 numbers, each with maximum 24 digits, can be stored into the external EEPROM. The store procedure is as follows: 1. Press [PG] to enter program mode 2. Enter location (MR + digit 3 ; M1 to 8; or SH + M1 to 8) 3. Enter number 4. Press [PG] to store and exit or go on-hook to abort 5. Go to 1 for storing further numbers [Mute] [R/P] starts and stops security storing (LCD-Symbols [ and ]) inserts a pause (LCD-Symbol P)
Tone Ringer (Melody/Volume)
The tone ringer incorporates two basic selection, namely 2tone or 3-tone melodies. The default set-up selection is the 3-tone ringer. Table 25: Basic ringer melody selection [PG] + [0] + (Password) + [#] + [8] + (digit) + [PG] Digit [0] [1] Ringer Melody 2-tone 3-tone
The user can chose the following melodies as shown in below table. Table 26: 3-tone melody programming Procedure [PG] + [7] + Digit Sequence Rate [0] F1 F2 F3 F1 F2 F3 1 [1] F1 F2 F3 F1 F2 F3 2 [2] F1 F2 F3 F1 F2 F3 4 [3) F1 F2 F3 F1 F2 F3 6 [4] F1 F2 F3 F1 F2 F3 10 Press [PG] to store and terminate The chosen melody will be heard in the loudspeaker during programming. Pressing the [PG] key will end the procedure and the last selected melody will be stored. When 2-tone melody is selected through the set-up procedure, it is possible to chose the following melodies: Table 27: 2-tone melody programming Procedure [PG] + [7] + Digit Sequence F1 F2 F1 F2 F1 F2 F1 F2 F1 F3 F1 F3 F1 F3 F1 F3 F2 F3 F2 F3 and terminate Rate 2 5 2 5 2 [0] F1 F2 [1] F1 F2 [2] F1 F3 [3) F1 F3 [4] F2 F3 Press [PG] to store
Tone Generator
The tone generator incorporates the DTMF tones, 3 frequencies for the tone ringer and pacifier tones.
DTMF
The DTMF generator provides 7 frequencies. Table 23: DTMF frequencies Digit Rows 1-2-3 4-5-6 7-8-9 -0-# Columns 1-4-7- 2-5-8-0 3-6-9-# Frequency Low Group 697 Hz 770 Hz 852 Hz 941 Hz High Group 1209 Hz 1336 Hz 1477 Hz
The MF output level can be set through set-up programming. The range is from -18 dBm to -6 dBm in 1 dB steps. Table 24: DTMF level settings [PG] + [0] + (Password) + [0] + [6] + (x) + [PG] Key (x) [0] [1] [2] [3] [4] [5] [6] Level (dBm) Low Group -18 -17 -16 -15 -14 -13 -12 Key (x) [7] [8] [9] [M1] [M2] [M3] Level (dBm) Low Group -11 -10 -9 -8 -7 -6
Repetition rate means that a sequence of 6 frequencies is repeated 1, 2, 4, 5, 6 or 10 times within 1 second.
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.
3
Digit includes 0 - 9, and #
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Datasheet AS2525
austriamicrosystems
Serial Bus
The AS2525 incorporates a microwireTM compatible serial bus (DO, DI, and CLK) with two chip select outputs (CS1 and CS2). The serial bus is used to:
-
Table 28: Pacifier tone selection [PG] + [0] + (Password) + [#] + [9] + (digit) + [PG] Digit [0] [1] Pacifier Tone (Key-in Tone) Disabled Enabled
sending data to the LCD driver (AS2591) when a key is pressed or a number is dialed out reading and writing to the external EEPROM under following conditions:
Table 29: Pacifier tones Key Entry Acknowledge Reject/Terminate Frequency 1333 Hz 1333 Hz Duration 40 ms 4 x 40 ms
-
Table 31: EEPROM read/write timings ACTION After After After After After off-hook (debounced) on-hook (debounced) first rising edge at FCI PG is terminated pressing [V+]/[V-] DURATION 50 ms 200 ms 10 ms 12...600 ms 20 ms
An invalid key entry will be indicated by a rejection tone of 4 times 40 ms. 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. Table 30: DTMF comfort tone level setting [PG] + [0] + (Password) + [0] + (y + x) + [PG] Key (y + x) [9] [9] [9] [9] + + + + [0] [1] [2] [3] Level (dBr) Earpiece -36 -30 -24 -18 Key (y + x) [0] [0] [0] [0] + + + + [0] [1] [2] [3] Level (dBr) Loudspeaker -15 -9 -3 3
See also AS2591 data sheet for further information.
LCD Control
The AS2525 is designed to work together with the LCD driver AS2591 (see also AS2591 data sheet).
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Datasheet AS2525
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Electrical Characteristics
Absolute maximum ratings
Positive Supply Voltage Input Current Input Voltage (LS) Input Voltage (LI, CS) Input Voltage (STB, RI) Digital Input Voltage Electrostatic Discharge Storage Temperature Range Total Power Dissipation * Exceeding these figures may cause permanent damage. Functional operation under these conditions is not permitted. -0.3 V DD 7V +/- 25 mA -0.3V V IN 12V -0.3V V IN 8V -2V V IN VDD +0.3V -0.3V V IN V DD + 0.3V +/- 1000V -65 to +125C 500mW
Recommended Operating Range
Symbol VDD TAMB fOSC Parameter Supply Voltage (internally generated) Ambient Operating Temp. Range Oscillator Frequency Resonator: Murata CSA 3.58M G312AM Conditions Speech mode Min. 3.0 -25 3.58 Typ.* Max. 5.0 +70 Units V C MHz
* Typical figures are at 25C and are for design aid only; not guaranteed and not subject to production testing.
DC Characteristics
(ILINE = 15 mA, recommended operating conditions unless otherwise specified) Symbol IDD Parameter Operating Supply Current Conditions Speech mode Handsfree mode LD dialing, VDD = 2.5V Ring mode, VDD = 2.5V IDD-EXT Available Supply Current for Peripheral Circuits Idle Current Line Voltage, LIVolt = 0 Line Voltage, LIVolt = 1 IOL VIL VIH Output Current, Sink Pin CS, SS Input Low Voltage Input High Voltage VOL = 0.4V TAMB = 25C TAMB = 25C VSS 0.7 VDD Speech mode or MF dialing 2 2 3.2 4.2 3.5 4.5 1 0.3 VDD VDD 3.8 4.8 mA V V Min. Typ. 4 11 200 300 Max. 6 13 Units mA mA A A mA A V V
IDD0 VLI
Idle mode, VDD = 2 V, TAMB = 25C 13 mA< ILINE < 100 mA
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Datasheet AS2525
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AC Electrical Characteristics
ILINE = 15 mA; f = 800 Hz; ZAC = 1000; recommended operating conditions and default settings unless otherwise specified. Transmit Symbol ATX Parameter Transmit Gain, default Conditions M1/M2 to LS M3/M4 to LS Variation with Frequency THD VAGC ASCO tDECAY tDECAY ZIN Distortion Soft Clip Level Soft Clip Overdrive Attack Time Decay Time Input Impedance; M1/M2 Input Impedance; M3/M4 AMUTE VNO Mute Attenuation Noise Output Voltage Mute activated TAMB = 25C, handset mode ATX = 37 dB Differential +/- 1 60 -72 f = 500 Hz to 3.4 kHz VLS < 0.25 VRMS VLS = 2 20 70 100 10 10 Min. 34.3 42.0 Typ. 35.8 44.0 +/- 0.8 2 Max. 37.3 46.0 Units dB dB dB % V dB s/6dB ms/6dB k k dB dBmp
VIN MAX
Input Voltage Range; M1/M2 and M3/M4
VPEAK
Line Driver Symbol VIN MAX VTX RL ZAC/TEMP Parameter Input Voltage Range; LI Dynamic Range; LI Return Loss Temperature Variation ZRL = 1000 ; TAMB = 25C 18 0.5 Test Conditions Min. Typ. +/- 2 +/- 2 Max. Units VPEAK VPEAK dB /C
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Datasheet AS2525
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Receive Symbol ARX Parameter Receive Gain, Default Conditions LS to RO; volume reset LS to LO1/LO2; volume max. ARX-VOL ARX THD Volume Control Range Variation with Frequency Distortion, RO Distortion, LO1/LO2 VAGC ASCO tDECAY tDECAY VNO VUFC Soft Clip Level Soft Clip Overdrive Attack Time Decay Time Noise Output Voltage, RO Unwanted Frequency Components Input Impedance, RI Input Voltage Range, RI Side Tone Cancellation Input Impedance, STB Input Voltage Range, STB VRI < 0.25 VRMS 26 80 +/- 2 TAMB = 25C, ARX = 3 dB 50 Hz.........20 kHz VRI > 0.8 VRMS 8 steps through [V-]/[V+] keys f = 500 Hz to 3.4 kHz VRO = 0.25 VRMS VLO1/2 = 0.25 VRMS VRO = 1 10 70 100 -72 -60 Min. -2.0 25.0 Typ. -0.5 27.0 15 +/- 0.8 2 5 Max. 1.0 29.0 Units dB dB dB dB % % VPEAK dB s/6dB ms/6dB dBmp dBmp
ZIN VIN-MAX RI AST ZIN VIN-MAX ST
8 +/- 2
k VPEAK dB k VPEAK
General Timings Symbol td tHS-L tHS-H tFD Parameter Key Debounce Time Low/High Debounce High/Low Debounce Flash Duration HS Input (going off-hook) HS Input (going on-hook) FL 1 (default) FL 2 (default) tPFP tAP Post Flash Pause Access Pause P1 (default) P2 (default) 0.9 100 275 285 274 1.0 3.0 1.1 Conditions Min. Typ. 15 15 210 102 300 Max. Units ms ms ms ms ms ms sec. sec.
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Datasheet AS2525
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DTMF Symbol DF Parameter Frequency Deviation Conditions Deviation of ceramic resonator is not included Default -4.5 -5.5 Min. Typ. Max. 1.2 Units %
VMF
MF Tone Level at LS (Low Group) MF Tone Level Range at LS (Low Group) Pre-emphasis, Low to High Unwanted Frequency Components
-6.5
dBm
VMF-RANGE
13 steps
-18/-6
dBm
VL_H VUFC
2.0 300 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 Default Default From 10% to 90% amplitude From 90% to 10% amplitude Relative to LS, 4 steps 80 80
2.6
3.2 -40 -46 -52 -58 -70 -80
dBr dBm dBm dBm dBm dBm dBm ms ms ms ms dBr
tTD tITP tTR tTR VCT
Tone Duration, Minimum Inter Tone Pause, Min. Tone Rise Time Tone Fall Time Comfort Tone Level, RO
82.3 82.3
85 85 5 5
-36 -18
LD Dialing Symbol tDR Parameter Dialing Rate Default Option t/B Break Period Default Option Option tM/ Make Period Default Option Option tPDP tIDP Pre-Digit Pause Inter-Digit Pause 800 38 57 Conditions Min. 9.53 Typ. 10 20 61.2 66 33 40.8 33 16.5 35 880 42 63 Max. 10.5 Units pps pps ms ms ms ms ms ms ms ms
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Datasheet AS2525
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Tone Ringer Symbol F1 F2 F3 tDT fMIN fMAX Parameter Frequency 1 Frequency 2 Frequency 3 Detection Time Min. Detection Frequency Max. Detection Frequency Initial 12 68 Conditions Min. 770 1025 1280 Typ. 800 1067 1333 100 13 70 14 75 Max. 830 1110 1385 Units Hz Hz Hz ms Hz Hz
Pacifier Tone Symbol VPARO Parameter Tone Output Level, RO Tone Output Level, LO1/2 fPT tTBD Frequency Tone Burst Duration RL = 150 RL = 32 Key entry Key entry Acknowledge, terminate PG mode Rejection, invalid key entry tITP Inter-Tone Pause Conditions Min. Typ. 30 300 1333 40 140 4x40 80 Max. Units mVP-P mVP-P Hz ms ms ms ms
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Datasheet AS2525
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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 tIDP tPDP tB tM tB tM tAP
Pause
tIDP
tPDP
tB
tM
MF dialling MUTE MASK DPN TONE tTD tITP tTD tITP tAP
Pause
tTD
tITP
Figure 9: Timing diagrams
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Datasheet AS2525
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Test Circuit
25 CM 18
CI
A 10 100 ILINE 600 ohm 30 ohm
17 LS 15 M1
10
15 n
1k
RI
M2
8
15 n
11 300 ohm UL B 14 10 V 6k 1
STB
M3
9
15 n
1k
M4
7
15 n
LI BC 327 12 13
AGND
23 10
CS Vss OSC 33 3.58 MHz SS LO1 27 32 ohm
BC 327
16
26 22 29
VPP
LO2
28
VsSA
RO
21
10
150 ohm
44 43 42 41 1 CS2 2 3 4 32 30 31 37 38 39 40 DPn HF HS LED DM/HM FCI C1 C2 C3 C4 VDD FT2 CS1 DO DI CLK FT1 RECV RECI
19
100 n
20
100 n
10 k
10 5 10 10
10 k
6
CBN
24
22 22
34 R1 35 R2 36 R3
Figure 10: Test circuit
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Datasheet AS2525
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Typical Application
Figure 11: Typical application
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Datasheet AS2525
austriamicrosystems
Ordering Information
Number AS2525 Q AS2525 F Package TQFP DOF Description plastic thin quad flat package - 44 leads (suffix T) Dice-on-Foil
Packaging
44-in plastic TQFP (suffix Q) For exact mechanical package dimensions please see austriamicrosystemsAG packaging information.
Marking, Pin-out
CS1 DO DI CLK C4 C3 C2 C1 R3 R2 R1
CS2 DPn HF HS FT1 FT2 M4 M2 M3 M1 STB
1
39
6
YYWWAAA AS2525x Austria
28
17
OSC LED FCI DM/HM VSSA LO2 LO1 VPP CM CBN AGND
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 regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. 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 extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application.
YY WW AAA X
year of production calendar week of production austriamicrosystemsAG assembly ID revision
CS VSS LI RI SS LS CI RECI RECV RO VDD
Copyright
Copyright (c) 1997-2002, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). 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. 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.
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Datasheet AS2525
austriamicrosystems
Contact
Headquarters
austriamicrosystems AG Communications Business Unit A 8141 Schloss Premstatten, Austria T. +43 (0) 3136 500 0 F. +43 (0) 3136 525 01 www.austriamicrosystems.com
Sales Offices
Germany
austriamicrosystems Germany GmbH Tegernseer Landstrasse 85 D-81539 Munchen, Germany Phone: +49/89/693643-0 Fax: +49/89/693643-66
USA (east)
austriamicrosystems USA, Inc. Suite 400, 8601 Six Forks Road Raleigh, NC 27615, USA Phone: +1/919/676 5292 Fax: +1/919/676 5305
France
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
United Kingdom
austriamicrosystems UK, Ltd. Coliseum Business Centre, Watchmoor Park Camberley, Surrey, GU15 3YL, UK Phone: +44/1276/23 3 99 Fax: +44/1276/29 3 53
Italy
austriamicrosystems Italy S.r.l. Via Leone Tolstoi, 64 I-20146 Milano, Italy Phone: +39/0242/36713 Fax: +39/0242/290889
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
Switzerland
austriamicrosystems Switzerland AG Rietstrasse 4 CH-8640 Rapperswil, Switzerland 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 (west)
austriamicrosystems USA, Inc. Suite 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.
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