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Preliminary
AS2525
Single-Chip Handsfree Phone CMOS Integrated Circuit
Austria Mikro Systeme International AG
Key Features
q Line/speech handsfree circuit, LD/MF repertory dialler, and tone ringer on one 44 pin CMOS chip q Operating range from 15 to 100 mA line current (down to 5 mA with slightly reduced performance) q All significant parameters programmable with external EEPROM q Volume control of receiver signal q Handsfree function with enhanced voice switching q Low noise (max. -72 dBmp) q Unique EMC performance q LD/MF switchable dialling with temporary MF mode q Repertory dialling with last number redial and memory dialling (8 x 2 direct and 10 indirect) q Call restriction with PIN code q Serial interface for EEPROM and LCD driver q 2-tone/3-tone ringer with ring frequency detection
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 31 digit last number redial storage and memories for 26 numbers each containing up to 21 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.
Package
Available in 44 pin TQFP.
Block Diagramme
LS V DD VDD LINE SENSE SUPPLY VREF FT2 AGND A GND NOISE DET. + CS - SS + + AGND - M3 PEAK DET. M4 V PP V SS CI 300 RI STB + ZBAL - PEAK DET. LO2 V SSA RECI HS HF DM/HM DEBOUNCE DTMF MELODY RECV V SS - + VOICE SWITCHING V PP LO1 M2 CBN FT1 M1 V DD
30
LI
AS2525
V DD
V PP
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
Rev. 1.3
Page 1
May 1999
Preliminary 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.
AS2525
2
DPn
DO
Dial Pulse Output Digital output which holds the line during off-hook operation or pulls low during break periods of pulse dialling and flash. HandsFree Switch Input This is an Schmitt-trigger input that is pulled high to enable handsfree operation. HandSet Switch Input This is an Schmitt-trigger input that is pulled high by the hook switch to enable handset or headset operation.
Analogue input pin for connecting a capacitor for offset cancellation. Analogue input pin for connecting a capacitor for offset cancellation.
3
HF
DI
4
HS
DI
5 6 7 8 9 10 11 12
FT1 FT2 M4 M2 M3 M1 STB CS
AI AI AI AI AI AI AI AO
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 synthesising ac- and dc-impedance, modulation of line voltage and shorting the line during make periods of pulse dialling. Voltage Source Source
Negative Power Supply.
13 14 15 16
VSS LI RI SS
Supply AI AI AO
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. Line Current Sense Input
Analogue input for sensing the line current.
17
LS
AI
Rev. 1.3
Page 2
May 1999
Preliminary
Pin # 18 19 Symbol CI RECI Type AI AI Description
AS2525
Complex Impedance Input Analogue input pin for the capacitor to program a complex impedance.
RECeive Input Analogue input for the handsfree receive path. Should be connected to RO via a coupling capacitor. RECeive Voice Switching Input Analogue input for receive voice switching path.
20 21 22 23 24 25
RECV RO VDD AGND CBN CM
AI AO Supply Supply AI DO
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 Supply DI
Loudspeaker Outputs 1/2
Output pins for a 32 ( 25 to 50 ) loudspeaker. Power supply pin for LO1-LO2 output amplifier.
Dial Mode/Headset Mode Switch Input Digital input for choosing between LD and MF dialling or choosing handset and headset mode. See "Table 3: Parameter settings" for further details. This pin is scanned after manual off-hook only. Frequency Comperator Input
This is a Schmitt-trigger input for ring frequency discrimination. Disabled during off-hook.
31
FCI
DI
32 33 34 35 36 37 38 39 40 41
LED OSC R1 R2 R3 C1 C2 C3 C4 CLK
DO
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 (see Figure 4: Keyboard Layout). Keyboard Columns (see Figure 4: Keyboard Layout).
DI/O
DO
Clock
Clock output for 3-wire bus. If signal is not activated, a pull down resistor (100 k) is inserted.
Rev. 1.3
Page 3
May 1999
Preliminary
Pin # 42 Symbol DI Type DI Description
AS2525
Data Input Data input of 3-wire bus. If signal is not activated, a pull down resistor (100 k) is inserted. 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. Chip Select 1 Chip select signal for external EEPROM. If signal is not activated, a pull down resistor (100 k) is inserted.
AI: AO: AI/O: Analogue Input Analogue Output Analogue Input/output
43
DO
DO
44
CS1
DO
DI: DO: DI/O:
Digital Input Digital Output Digital Input/Output
Pin Configuration
Keyboard Layout
C1 C2 C3 C4
1 2
CS2 1 DPn 2 HF 3 HS 4 FT1 5 FT2 6 M4 7 M2 8 M3 9 M1 10 STB 11 33 32 31 30 29 28 27 26 25 24 23 OSC LED FCI Head VSSA LS2 LS1 VPP CM CBN AGND
YYWWAAA AS2525 Austria
3 MR V+ M1 M5
4 5 6 PG VM2 M6
7 8 9 R/P MT M3 M7
R1 R2 R3
0 # FL SH M4 M8
Figure 4: 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.
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 6: 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. Rev. 1.3 Page 4 May 1999
CS VSS LI RI SS LS CI RECI RECV RO VDD
12 13 14 15 16 17 18 19 20 21 22
Figure 3: Pin configuration
Preliminary Key Definitions and Procedures
Table 1: Key definitions Key [0] - [9], [#], [] [] [PG] Condition Off-hook LD mode Speech mode Programme mode [MT] Speech mode Mute state Programme mode [R/P] Programme state [FL] [V+] [V-] [MR] [M1] - [M8] [SH] 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 dialling mode Select pause duration Key lock toggle Ringer volume Ringer melody LCD contrast Ringer on/off Programming Mode ([PG] + Digit) Speech mode Speech mode Function Digits Temporary MF select Enter programme state Exit programme state Enter mute state Exit mute state Enter blank Redial/Pause Pause Flash function Volume control Volume control Memory redial key Memory dial Second function (shift) Remark Function depending on mode
AS2525
Providing mixed mode dialling (default LD selected) To enter the programme state To terminate/exit programme state To enter mute state To terminate/exit mute state To enter blank digit during programming Allows re-signalling of the last dialled 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
Memory Location ([MR] + Digit) Memory 17 Memory 18 Memory 19 Memory 20 Memory 21 Memory 22 Memory 23 Memory 24 Memory 25 Memory 26 -
Rev. 1.3
Page 5
May 1999
Preliminary
Table 3: Parameter settings Parameter 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 Rev. 1.3 KT Symbol 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 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] + [#] + [9] + [#] + [0] + Page 6 Default 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 Options
AS2525
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 May 1999
Preliminary
Parameter 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 Symbol Procedure: [PG] + [0] + (Password) + [#] + [] + [#] + [#] + [9] + [1] + [9] + [2] + [9] + [3] + [9] + [4] + [9] + [5] + [9] + [6] [9] + [7] + [9] + [8] + [9] + [9] + [9] + [0] + [9] + [] + [9] + [#] + Default [1] = on [0] = off [0] = off [1] = on [1] = on [1] = x 2 [1] = reset by on/off-hook Options [0] = off [1] = on [1] = on [0] = off [0] = off
AS2525
[0] = x 1; [2] = x 4; [3] = x 8 [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
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
Table 4: Timing selection by HEX code
R1
1 2 3
4 5 6
7 8 9
Parameter Inter-digit pause Tone duration Inter-tone pause
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
0
R2 R3
A (M1) B (M2) C (M3) D (M4) E (M5) F (M6)
Figure 5: Keys for HEX-code entry Data = 4096 - (fOSC /(51212) T (T = Time; fOSC = 3.58 MHz) Rev. 1.3 Page 7
Flash 1 Flash 2 Pause 1 Pause 2 Post-digit pause Post-flash pause
May 1999
Preliminary
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
AS2525
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 Dialling Mode Select Pause Time Easy Key Lock 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
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 User-code programming ...write/read by AS2525 C) stored numbers Set-up programming "reset to factory settings"
Figure 6: 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 by set-up programming, the AS2525 automatically performs a "reset to factory settings" to load this changes also into area B. Rev. 1.3 Page 8 May 1999
Preliminary 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
ZBAL R2 = 300 ohm
AS2525
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 .
R1 = 30 ohm
ZLINE
Figure 8: 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]
VLine
8
(V)
6
Key (x)
VLS
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
4
VLI
2
0 0 20 40 60 80
ILine
(mA)
100
Figure 7: DC characteristic with low dc mask
[0] [1] [2) [3] [4] [5] [6] [7]
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.
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)
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
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.
Rev. 1.3
Page 9
May 1999
Preliminary
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
AS2525
voltage at RO to 1 VPEAK. It prevents harsh distortion and acoustic shock. 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
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 11: Handsfree Tx soft clipping selection [PG] + [0] + (Password) + [9] + [2] + (digit) + [PG] Digit [0] [1] Handfree 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 user can also change the gain using the [V+]/[V-] keys (see section "Handsfree"). The volume range is 15 dB (-7/+8 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] Handfree Rx Soft Clipping (Loudspeaker) Disabled Enabled
The user can also change the gain within this range in 4 dB steps via the [V+]/[V-] keys. The receive default 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
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.
Rev. 1.3
Page 10
May 1999
Preliminary
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
TX_atten RX Voice switching speech Backgnd noise monitor voice switching circuit
AS2525
attenuation scheme) shows how voice switching is controlled.
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 -15 dB. The following table (Table 18: Handsfree
Figure 9: 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
LINE +14dB +8dB +3dB
FT2
Gmax = +9dB Gmin = -21dB ... -40dB (VOL)
+23dB
Offset comp
Compress
Peak detector Voice switching
speech Peak detector Compress Offset comp
FT1 CBN
CTXoffset
RO
RECV
Offset comp
Compress
Peak detector
Cmicoffset CBckgnd
RECI
Gmax = -4dB ... +16dB (VOL) Gmin = -33dB
+12dB
Figure 10: Signal path of handsfree circuit
Rev. 1.3
Page 11
May 1999
Preliminary
Table 18: Handsfree attenuation scheme Speech RX > TX_atten X Mode Receive RX-gain 0 dB to -20 dB TX-gain -50 dB to -30 dB Remark
AS2525
adjustable with [V+]/[V-] keys in 8 steps middle position
TX_atten > RX
No
Idle
-25 dB
-25 dB
TX_atten > RX
Yes
Transmit
-50 dB
0 dB
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 11: Gain transition of voice switching
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)
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
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).
Rev. 1.3
Page 12
May 1999
Preliminary
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
AS2525
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).
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.
DC/DC converter
When a valid ring signal is detected, the dc/dc converter is started.
Rev. 1.3
Page 13
May 1999
Preliminary Dialling 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 4: Keyboard Layout).
AS2525
5. Press [PG] (= store and exit) or go onhook to abort.
Key Lock
A key lock function is provided to allow the user to protect the telephone from any mis-use. 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 programme mode 2. Press [1] +(PIN) + [#] + [6] 3. Press [1] for enable or [0] for disable
PIN Code
A PIN code is available for protection various user settings. The default PIN code is set to 1111 and can be change as follows: 1. Press [PG] to enter programme 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 onhook to abort It is also possible to reset the PIN code through setup programming: 1. Press [PG] to enter programme mode 2. Press [0) + (Password) + [#] + [0] 3. Press [1] to reset 4. Press [PG] (= store and exit) or go onhook to abort
4. Press [PG] (= store and exit) or go onhook to abort Also an easy key lock function is provided. This function can be activated/disactivated when the key lock function is available through set-up programming and the previous mentioned key lock through PIN code is disabled.
Clear Memory Procedure
It is possible to clear all stored numbers by using the PIN code as follows: 1. Press [PG] to enter programme mode 2. Press [1) + (PIN) + [#] + [7] 3. Press [1] for clear 4. Press [PG] (= store and exit) or go onhook to abort
Call Restriction
A call restriction function is accommodated. This function can be activated using the PIN code. Storing digits for call restriction: 1. Press [PG] to enter programme mode
2. Press [1] + (PIN) + []
Reset to Factory Settings
It is possible to reset all settings to the default factory settings with following procedure: 1. Press [PG] to enter programme mode 2. Press [1] + (PIN) + [#] + [8] 3. Press [1] for reset 4. Press [PG] (= store and exit) or go onhook to abort
3. Press [1] for first call restriction and [2] for second call restriction 4. Key in digits for call restriction (2 digits, [MT] for blank)
Rev. 1.3
Page 14
May 1999
Preliminary
Dial Mode Selection
The default signalling mode (LD or MF) is selectable through following procedure: 1. Press [PG] to enter programme 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 onhook 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 on-hook. Table 22: Flash duration setting
AS2525
[PG] + [0] + (Password) + [] + (digit) + (HEX) + [PG] Digit [4] [5] Timing HEX code HEX code Flash Duration Flash 1 Flash 2
One of two pre-programmed can be selected as follows: 1. Press [PG] to enter programme 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 onhook 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.
Re-Dialling (Last Number Redial)
Re-dialling is a facility that allows re-signalling of the last dialled number without keying in all the digits again. Numbers dialled out from any memory will also be stored in the LNR memory. The re-dialling works in following manner:
* Any digit (including Flash, Pause, and MF select) being dialled is storable in the LNR memory up to a total of 31 digits. * If more than 31 digits are entered, re-dialling will be inhibited. * Pressing the [R/P] key as first entry after off-hook (LNR cursor at first digit) will invoke dialling 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
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)
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 keycode dialling. 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 dialled out * Dialling halts (pauses) * Dialling is resumed, 123 is dialled out.
Pauses can also be inserted by pressing the [R/P] key in programme mode.
Flash Function
A flash, [FL] key, activation will invoke a timed loop break. The flash duration can be programmed through set-up (see Figure 5: Keys for HEX-code entry and Table 4: Timing selection by HEX code):
Rev. 1.3
Page 15
May 1999
Preliminary
Memory dialling is cascadable up to a the maximum of 31 digits/data. Table 25: Basic ringer melody selection
AS2525
[PG] + [0] + (Password) + [#] + [8] + (digit) + [PG] Digit [0] [1] Ringer Melody 2-tone 3-tone
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 user can chose the following melodies as shown in below table. Table 26: 3-tone melody programming Procedure [PG] + [7] + Digit [0] [1] [2] [3) [4] Sequence F1 F2 F3 F1 F2 F3 F1 F2 F3 F1 F2 F3 F1 F2 F3 F1 F2 F3 F1 F2 F3 F1 F2 F3 F1 F2 F3 F1 F2 F3 Rate 1 2 4 6 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 [0] [1] [2] [3) [4] Sequence 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 Rate 2 5 2 5 2
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] + [7] + (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
The pre-emphasis is 2.6 dB. The DTMF tones are according to CEPT recommendations. 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.
Press [PG] to store and terminate 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.
Rev. 1.3
Page 16
May 1999
Preliminary
Table 28: Pacifier tone selection [PG] + [0] + (Password) + [#] + [9] + (digit) + [PG] Digit [0] [1] Pacifier Tone (Key-in Tone) Disabled Enabled
AS2525
Serial Bus
The AS2525 incorporates a serial bus (DO, DI, and CLK) with two chip select outputs (CS1 and CS2). The serial bus is used to:
* sending data to the LCD driver (AS2591) when a key is pressed or a number is dialled 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 off-hook (debounced) After on-hook (debounced) After first rising edge at FCI After PG is terminated After 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 dialling 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] + [0] [9] + [1] [9] + [2] [9] + [3] Level (dBr) Earpiece -36 -30 -24 -18 Key (y + x) [0] + [0] [0] + [1] [0] + [2] [0] + [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).
Rev. 1.3
Page 17
May 1999
Preliminary Electrical Characteristics
Absolute Maximum Ratings*
AS2525
Supply Voltage............................................................................................................................... -0.3 VDD 7V Input Current..........................................................................................................................................+/- 25 mA Input Voltage (LS) ....................................................................................................................... -0.3V VIN 12V Input Voltage (LI, CS)................................................................................................................... -0.3V VIN 8V Input Voltage (STB, RI) .........................................................................................................-2V VIN VDD +0.3V Digital Input Voltage ..........................................................................................................-0.3V VIN VDD + 0.3V Electrostatic Discharge...........................................................................................................................+/- 1000V Storage Temperature Range........................................................................................................... -65 to +125C Total Power Dissipation ............................................................................................................................ 500mW
*Exceeding these figures may cause permanent damage. Functional operation under these conditions is not permitted.
Recommended Operating Range
Symbol VDD TAMB fOSC Parameter Conditions Min. 3.0 -25 Resonator: Murata CSA 3.58M G312AM 3.58 Typ.* Max. 5.0 +70 Units V C MHz
Supply Voltage (internally generated) Speech mode Ambient Operating Temp. Range Oscillator Frequency
* 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 dialling, VDD = 2.5V Ring mode, VDD = 2.5V IDD-EXT IDD0 V
LI
Min.
Typ. 4 11 200 300
Max. 6 13
Units mA mA A A mA
Available Supply Current for Peripheral Circuits Idle Current Line Voltage, LIVolt = 0 Line Voltage, LIVolt = 1
Speech mode or MF dialling Idle mode, VDD = 2 V, TAMB = 25C 13 mA< ILINE < 100 mA
2 2 3.2 4.2 3.5 4.5 1 VSS 0.7 VDD 3.8 4.8
A V V mA 0.3 VDD V VDD V
IOL VIL VIH
Output Current, Sink Pin CS, SS Input Low Voltage Input High Voltage
VOL = 0.4V TAMB = 25C TAMB = 25C
Rev. 1.3
Page 18
May 1999
Preliminary
AC Electrical Characteristics
AS2525
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 VIN MAX Mute Attenuation Noise Output Voltage Input Voltage Range; M1/M2 and M3/M4 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 VPEAK
Line Driver
Symbol VIN MAX VTX RL
ZAC/TEMP
Parameter Input Voltage Range; LI Dynamic Range; LI Return Loss Temperature Variation
Test Conditions
Min.
Typ. +/- 2 +/- 2
Max.
Units VPEAK VPEAK dB
ZRL = 1000 ; TAMB = 25C
18 0.5
/C
Rev. 1.3
Page 19
May 1999
Preliminary
Receive
Symbol ARX Parameter Receive Gain, Default Condition LS to RO; volume reset LS to LO1/LO2; volume max. ARX-VOL
ARX
AS2525
Min. -2.0 25.0
Typ. -0.5 27.0 15 +/- 0.8
Max. 1.0 29.0
Units dB dB dB dB
Volume Control Range Variation with Frequency Distortion, RO Distortion, LO1/LO2
8 steps through [V-]/[V+] keys f = 500 Hz to 3.4 kHz VRO = 0.25 VRMS VLO1/2 = 0.25 VRMS VRO =
THD
2 5 1 10
% % VPEAK dB s/6dB ms/6dB
VAGC ASCO tDECAY tDECAY VNO VUFC ZIN VIN-MAX RI AST ZIN VIN-MAX ST
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 > 0.8 VRMS
70 100
TAMB = 25C, ARX = 3 dB 50 Hz.........20 kHz 8 +/- 2 VRI < 0.25 VRMS 26 80 +/- 2
-72 -60
dBmp dBmp 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 Condition Min. Typ. 15 15 210 102 300 Max. Units ms ms ms ms ms ms sec. sec.
Rev. 1.3
Page 20
May 1999
Preliminary
DTMF
Symbol DF VMF VMF-RANGE
VL_H
AS2525
Parameter Frequency Deviation MF Tone Level at LS (Low Group) MF Tone Level Range at LS (Low Group) Pre-emphasis, Low to High Unwanted Frequency Components
Condition Deviation of ceramic resonator is not included Default 13 steps
Min.
Typ.
Max. 1.2
Units % dBm dBm
-4.5
-5.5 -18/-6
-6.5
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
VUFC
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 Dialling
Symbol tDR Parameter Dialling Rate Condition 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 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
Rev. 1.3
Page 21
May 1999
Preliminary
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 Condition Min. 770 1025 1280 Typ. 800 1067 1333 100 13 70 14 75 Max. 830 1110 1385
AS2525
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 Condition RL = 150 RL = 32 Key entry Key entry Acknowledge, terminate PG mode Rejection, invalid key entry tITP Inter-Tone Pause Min. Typ. 30 300 1333 40 140 4x40 80 Max. Units mVP-P mVP-P Hz ms ms ms ms
Rev. 1.3
Page 22
May 1999
Preliminary Timing Diagrams
LD dialling MUTE MASK DPN tIDP tPDP tB tM tB tM tIDP tPDP tB tM
AS2525
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
Flash MUTE MASK DPN tM tFD
Flash1/2
tITP
tTD
tITP
tAP
Pause
tTD
tITP
tM
tPFP
tM
tFD
Flash1/2
tM
Figure 12: Timing diagrams
Rev. 1.3
Page 23
May 1999
Preliminary Test Circuit
25 CM CI 18
AS2525
A
17 LS 10 M1
15 n 10
1k
100 ILINE 600 ohm
30 ohm
15
RI M2
8
15 n
11 300 ohm UL B 14 6k 10 V 1
STB
M3
9
15 n
1k
7 M4
15 n
LI BC 327 12 CS 13 Vss
AGND
23 10
OSC
33 3.58 MHz
AS2525
BC 327
16
SS
27 LO1 32 ohm LO2 28
26 22 29
VPP
10 21 RO 100 n 19 RECI 100 n RECV 20 10 k
150 ohm
VsSA
44 CS1 43 42 41 CLK 1 CS2 2 DPn 3 HF 4 32 30 DM/HM 31 FCI 37 C1 38 C2 39 40 C3 C4 HS LED DO DI
10 FT1 5
10 k
FT2
6
10
CBN
24
10
22 VDD 22
34 R1 35 R2 36 R3
Figure 13: Test circuit Rev. 1.3 Page 24 May 1999
Preliminary Typical Application
AS2525
Figure 14: Typical application
Rev. 1.3 Page 25 May 1999
Preliminary Package Outline
44 Pin TQFP
See Package Catalogue
AS2525
Devices sold by Austria Mikro Systeme Int. AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Austria Mikro Systeme Int. 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 Austria Mikro Systeme Int. 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 Austria Mikro Systeme Int. 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 Austria Mikro Systeme Int. AG for each application. Copyright (c) 1999, Austria Mikro Systeme International AG, Schloss Premstatten, 8141 Unterpremstatten, Austria. 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. Austria Mikro Systeme Int. AG reserves the right to change or discontinue this product without notice.
Rev. 1.3
Page 26
May 1999

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