Preliminary AS2525 Single-Chip Handsfree Phone CMOS Integrated Circuit Austria Mikro Systeme International AG General Description Key Features 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. 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 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. q Handsfree function with enhanced voice switching q Low noise (max. -72 dBmp) q Unique EMC performance The device provides a volume control for the earpiece and the loudspeaker. The volume can be controlled by pressing the [V-]/[V+] keys. 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) The versatility of the circuit is provided by programming all parameters through an external EEPROM. This allows easy adaptation to various PTT requirements worldwide. q Call restriction with PIN code q Serial interface for EEPROM and LCD driver Package q 2-tone/3-tone ringer with ring frequency detection Available in 44 pin TQFP. Block Diagramme LS 30 Ω LI AS2525 V DD FT2 AGND VDD LINE SENSE CBN FT1 M1 A GND VREF SUPPLY V DD NOISE DET. + M2 CS – – + M3 SS + AGND PEAK DET. M4 V PP V PP V SS V DD – V SS + VOICE SWITCHING V PP CI LO1 PEAK DET. 300 Ω RI – LO2 + V SSA STB RECI ZBAL HS HF RECV DTMF MELODY DEBOUNCE DM/HM RO FCI DPN CPU DIALLER KEYSCANNING OSCILLATOR LED DI DO CLK Rev. 1.3 CS1 CS2 KEYBOARD (C1-4/R1-3) Page 1 3.58 MHz DC/DC CONVERTER CM May 1999 Preliminary AS2525 Pin Description Pin # Symbol Type Description 1 CS2 DO Chip Select 2 Chip select signal for external LCD driver circuit or 2 mA LED If signal is not activated, a pull down resistor ( 100 kΩ ) is inserted. 2 DPn DO Dial Pulse Output Digital output which holds the line during off-hook operation or pulls low during break periods of pulse dialling and flash. 3 HF DI HandsFree Switch Input This is an Schmitt-trigger input that is pulled high to enable handsfree operation. 4 HS DI HandSet Switch Input This is an Schmitt-trigger input that is pulled high by the hook switch to enable handset or headset operation. 5 FT1 AI Analogue input pin for connecting a capacitor for offset cancellation. 6 FT2 AI Analogue input pin for connecting a capacitor for offset cancellation. 7 M4 AI Microphone Input 4 Differential input for the handsfree microphone (electret). 8 M2 AI Microphone Input 2 Differential input for the handset microphone (electret). 9 M3 AI Microphone Input 3 Differential input for the handsfree microphone (electret). 10 M1 AI Microphone Input 1 Differential input for the handset microphone (electret). 11 STB AI Side Tone Balance Input Analogue input for side tone cancellation network. 12 CS AO 13 VSS Supply 14 LI AI 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. Line Input Analogue input used for power extraction and line current sensing. 15 RI AI Receive Input Analogue input for ac-separated receive signal. 16 SS AO Supply Source Control Output N-channel open drain output to control the external high power source transistor for supplying (Vpp) the loudspeaker amplifier in off-hook loudspeaking/handsfree mode. 17 LS AI Line Current Sense Input Analogue input for sensing the line current. Rev. 1.3 Page 2 May 1999 Preliminary AS2525 Pin # Symbol Type Description 18 CI AI Complex Impedance Input Analogue input pin for the capacitor to program a complex impedance. 19 RECI AI RECeive Input Analogue input for the handsfree receive path. Should be connected to RO via a coupling capacitor. 20 RECV AI RECeive Voice Switching Input Analogue input for receive voice switching path. 21 RO AO Receive Output to Handset Output for driving a dynamic earpiece with an impedance from 150 Ω to 300 Ω. 22 VDD Supply Voltage Drain Drain Positive Power Supply. 23 AGND Supply 24 CBN AI Analogue input pin for connecting a capacitor for background noise monitoring. 25 CM DO 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. 26 VPP Supply 27 28 LO1 LO2 AO 29 VSSA Supply 30 DM/HM DI 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. 31 FCI DI Frequency Comperator Input Analogue Ground Special ground for the internal amplifiers. Loudspeaker Power Supply High power supply for the output driver stage. Loudspeaker Outputs 1/2 Output pins for a 32 Ω ( 25 to 50 Ω ) loudspeaker. Power supply pin for LO1-LO2 output amplifier. This is a Schmitt-trigger input for ring frequency discrimination. Disabled during off-hook. 32 LED DO 33 OSC 34 35 36 R1 R2 R3 DI/O Keyboard Rows (see Figure 4: Keyboard Layout). 37 38 39 40 C1 C2 C3 C4 DI/O Keyboard Columns (see Figure 4: Keyboard Layout). 41 CLK DO Clock LED Output Digital output for connecting 2 mA LED to indicate handsfree mode. Oscillator Input Input for ceramic resonator 3.58 MHz. Clock output for 3-wire bus. If signal is not activated, a pull down resistor (100 kΩ) is inserted. Rev. 1.3 Page 3 May 1999 Preliminary AS2525 Pin # Symbol Type 42 DI DI Data Input Data input of 3-wire bus. If signal is not activated, a pull down resistor (100 kΩ) is inserted. 43 DO DO Data Output Data output of 3-wire bus. A 100 kΩ resistor connected from this pin to VSS enables key locking. If signal is not activated, a pull down resistor (100 kΩ) is inserted. 44 CS1 DO Chip Select 1 Chip select signal for external EEPROM. If signal is not activated, a pull down resistor (100 kΩ) is inserted. DI: DO: DI/O: Description Digital Input Digital Output Digital Input/Output AI: AO: AI/O: Pin Configuration YYWWAAA AS2525 Austria Keyboard Layout 33 32 31 30 29 28 27 26 25 24 23 OSC LED FCI Head VSSA LS2 LS1 VPP CM CBN AGND C1 C2 C3 1 2 4 5 6 PG VM2 M6 7 8 9 R/P MT M3 M7 3 MR V+ M1 M5 C4 ∗ 0 # FL SH M4 M8 R1 R2 R3 Figure 4: Keyboard Layout Maximum RON for key closure: 1 kΩ Minimum ROFF for open key: 1 MΩ CS VSS LI RI SS LS CI RECI RECV RO VDD 12 13 14 15 16 17 18 19 20 21 22 CS2 1 DPn 2 HF 3 HS 4 FT1 5 FT2 6 M4 7 M2 8 M3 9 M1 10 STB 11 Analogue Input Analogue Output Analogue Input/output See “Table 1: Key definitions” for description of key functions. Figure 3: Pin configuration 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 Preliminary AS2525 Key Definitions and Procedures Table 1: Key definitions Key Condition Function Remark [0] - [9], [#], [∗] Off-hook Digits Function depending on mode [∗] LD mode Temporary MF select Providing mixed mode dialling (default LD selected) Speech mode Enter programme state To enter the programme state Programme mode Exit programme state To terminate/exit programme state Speech mode Enter mute state To enter mute state Mute state Exit mute state To terminate/exit mute state Programme mode Enter blank To enter blank digit during programming Redial/Pause Allows re-signalling of the last dialled number and insertion of pauses Pause Each key pressure inserts a pause Flash function Invokes a timed loop break [PG] [MT] [R/P] Programme state [FL] [V+] Speech mode Volume control To increase the receive gain [V-] Speech mode Volume control To increase or decrease the receive gain Memory redial key To access memory by key codes Memory dial Access keys to memories 1 to 8 and 9 to 16 Second function (shift) To access second function of keys [MR] [M1] - [M8] [SH] Table 2: Digits Digit Key DTMF Mode (fLOW + fHIGH) Pulse Mode [0] 941 + 1336 Hz 10 pulses [1] 697 + 1209 Hz 1 pulse To enter PIN protected programming Memory 18 [2] 697 + 1336 Hz 2 pulses Select flash duration Memory 19 [3] 697 + 1477 Hz 3 pulses Select dialling mode Memory 20 [4] 770 + 1209 Hz 4 pulses Select pause duration Memory 21 [5] 770 + 1336 Hz 5 pulses Key lock toggle Memory 22 [6] 770 + 1477 Hz 6 pulses Ringer volume Memory 23 [7] 852 + 1209 Hz 7 pulses Ringer melody Memory 24 [8] 852 + 1336 Hz 8 pulses LCD contrast Memory 25 [9] 852 + 1477 Hz 9 pulses Ringer on/off Memory 26 [∗] 941 + 1209 Hz Temporary MF select - [#] 941 + 1477 Hz - - Rev. 1.3 Programming Mode ([PG] + Digit) Memory Location ([MR] + Digit) Memory 17 Page 5 May 1999 Preliminary AS2525 Table 3: Parameter settings Parameter Symbol Procedure: [PG] + [0] + (Password) + Default Options Inter-Digit Pause (LD) IDP [∗] + [1] + [HEX code] 840 ms 1.72 ms … 7.03 sec. (see Table 4) MF Tone Duration TD [∗] + [2] + [HEX code] 82 ms 1.72 ms … 7.03 sec. (see Table 4) MF Inter-Tone Pause ITP [∗] + [3] + [HEX code] 82 ms 1.72 ms … 7.03 sec. (see Table 4) Flash 1 Duration FL1 [∗] + [4] + [HEX code] 101 ms 1.72 ms … 7.03 sec. (see Table 4) Flash 2 Duration FL2 [∗] + [5] + [HEX code] 285 ms 1.72 ms … 7.03 sec. (see Table 4) Pause 1 Duration P1 [∗] + [6] + [HEX code] 1 second 1.72 ms … 7.03 sec. (see Table 4) Pause 2 Duration P2 [∗] + [7] + [HEX code] 3 seconds 1.72 ms … 7.03 sec. (see Table 4) Pre-Digit Pause (LD) PDP [∗] + [8] + [HEX code] 33 ms 1.72 ms … 7.03 sec. (see Table 4) Post Flash Pause PFP [∗] + [9] + [HEX code] 274 ms 1.72 ms … 7.03 sec. (see Table 4) Tx Gain, Handset ATX-HS [0] + [1] + [HEX code] 37 dB 30 to 45 dB (see Table 8) Rx Gain, Handset ARX-HS [0] + [2] + [HEX code] 1 dB -6 to 9 dB (see Table 12) Tx Gain, Handsfree ATX-HF [0] + [3] + [HEX code] 46 dB 39 to 54 dB (see Table 10) Rx Gain, Loudspeaker ARX-HS [0] + [4] + [HEX code] 29 dB 22 to 37 dB (see Table 14) Line Loss Compensation LLC [0] + [5] + [0] = off [1] = range 1: ILINE = 20 - 50 mA [2] = range 2: ILINE = 45 - 75 mA DTMF Level (Low Group) VMF [0] + [6] + [HEX code] -6 dBm -18 to -6 dBm in 1 dB steps (see Table 24) Tx Gain, Headset ATX-HEAD [0] + [7] + [HEX code] 37 dB 30 to 45 dB (see Table 20) Rx Gain, Headset ARX-HEAD [0] + [8] + [HEX code] 1 dB -6 to 9 dB (see Table 21) MF Comfort Tone, RO VMF-CT/RO [0] + [9] + [HEX code] -30 dBr -36 to -18 dBr in 6 dB steps (see Table 30) MF Comfort Tone, LO1/2 VMF-CT/LO [0] + [0] + [HEX code] -9 dBr -15 to 3 dBr in 6 dB steps (see Table 30) Make/Break Ratio (LD) M/B [#] + [1] + [1] = 2 : 3 [0] = 1 : 2 Dial Rate (LD) DR [#] + [2] + [0] = 10 pps [1] = 20 pps DC Mask (LI Voltage) VLI [#] + [3] + [1] = 4.5 Volt [0] = 3.5 Volt Tx Soft Clip (Handset) [#] + [4] + [1] = on (2 VPEAK) [0] = off Rx Soft Clip (Handset) [#] + [5] + [1] = on (1 VPEAK) [0] = off Noise Monitoring (HF) [#] + [6] + [1] = on [0] = off Loudhearing Mode [#] + [7] + [1] = HF only [0] = LH and HF modes available Ringer Melody [#] + [8] + [1] = 3-Tone [0] = 2-Tone [#] + [9] + [1] = on [0] = off [#] + [0] + [1] = 1111 Selected by user Key-in Tone (Beep) Reset PIN Code Rev. 1.3 KT Page 6 May 1999 Preliminary AS2525 Parameter Symbol Procedure: [PG] + [0] + (Password) + Default Options Flash 1 During LD [#] + [∗] + [1] = on [0] = off Flash 2 During LD [#] + [#] + [0] = off [1] = on Extended LCD Symbols [9] + [1] + [0] = off [1] = on Tx Soft Clip, Handsfree [9] + [2] + [1] = on [0] = off Rx Soft Clip, Handsfree [9] + [3] + [1] = on [0] = off Voice Switching, Speed [9] + [4] + [1] = x 2 [0] = x 1; [2] = x 4; [3] = x 8 Handset/Headset Volume [9] + [5] + [1] = reset by on/off-hook [0] = setting is maintained LCD Test [9] + [6] Turns on all segments, pressing any further key turns on all digits “1” and all symbols off. Temporary MF by ∗ with tone [9] + [7] + [0] = off [1] = on Key Lock Function [9] + [8] + [1] = available [0] = not available [9] + [9] + [1] = MF/LD [0] = Handset/Headset Ringer Off Function [9] + [0] + [1] = available [0] = not available Key Test [9] + [∗] + Any key pressure turns the LED on Volume Control on Handset [9] + [#] + [1] = enabled Pin Select “DM/HM” DM/HM [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 1 2 4 5 6 7 8 9 3 C4 0 Table 4: Timing selection by HEX code R1 Parameter Default HEX Binary Data R2 Inter-digit pause 840 ms E17 1111 0001 0111 R3 Tone duration 82 ms FD0 1111 1101 0000 Inter-tone pause 82 ms FD0 1111 1101 0000 Flash 1 101 ms FC4 1111 1100 0100 Flash 2 285 ms F5A 1111 0101 1010 Pause 1 1 sec DB9 1101 1011 1001 Pause 2 3 sec 92C 1001 0010 1100 Post-digit pause 33 ms FED 1111 1110 1101 Post-flash pause 274 F60 1111 0110 0000 A (M1) B (M2) C (M3) D (M4) E (M5) F (M6) Figure 5: Keys for HEX-code entry Data = 4096 - (fOSC /(512∗12) ∗ T (T = Time; fOSC = 3.58 MHz) Rev. 1.3 Page 7 May 1999 Preliminary AS2525 Table 5: User programming with PIN code Function Symbol Procedure Options Call Restriction 1 CR1 [PG] + [1] + (PIN) + [∗] + [1] + Key in two digits, use [MT] for blank Call Restriction 2 CR2 [PG] + [1] + (PIN) + [∗] + [2] + Key in two digits, use [MT] for blank Key Lock [PG] + [1] + (PIN) + [#] + [6] + [0] = unlocked and [1] = locked Clear All Memories [PG] + [1] + (PIN) + [#] + [7] + Press [1] to clear Reset To Factory Settings [PG] + [1] + (PIN) + [#] + [8] + Press [1] to reset [PG] + [1] + (PIN) + [0] + Key in new PIN + new PIN Change PIN Code PIN Press [PG] to store setting and terminate procedure Table 6: Mode programming Function Symbol Procedure Options Select Flash FL [PG] + [2] + [0] = Flash 1 and [1] = Flash 2 Select Dialling Mode DM [PG] + [3] + [0] = LD (pulse) and [1] = MF (DTMF) P [PG] + [4] + [0] = Pause 1 and [1] = Pause 2 Easy Key Lock [PG] + [5] + [3] + [9] Toggles between locked and unlocked Ringer Volume [PG] + [6] + [1] = -16 dB, [2] = -7 dB, and [3] = 0 dB (maximum) Ringer Melody [PG] + [7] + [0], [1], [2], [3], or [4] [PG] + [8] + [1], [2], or [3] (see also AS2591 data sheet) [PG] + [9] + [0] = Off and [1] = On Select Pause Time LCD Contrast V33 Bell On/Off 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 Set-up programming "reset to factory settings" B) user settings User-code programming …write/read by AS2525 C) stored numbers 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 AS2525 Functional Description Side-Tone DC Conditions A good side-tone cancellation can be achieved by using the following equation: 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 Ω resistor between pin LI and LS. It can be calculated by the following equation: ZBAL/ZLINE = 10 This is assuming that the side-tone reference resistor, R2 (between LI and STB) is 300 Ω and R1 is 30 Ω. R1 = 30 ohm ZLINE VLS = VLI + ILINE ∗ 30 Ω ZBAL VLI can be programmed to be 3.5 V or 4.5 V. Table 7: DC mask selection Figure 8: Side-tone balance [PG] + [0] + (Password) + [#] + [3] + (digit) + [PG] Digit R2 = 300 ohm Transmit Path DC Mask (dc voltage at pin LI) [0] Low dc mask, VLI = 3.5 Volt [1] High dc mask, VLI = 4.5 Volt 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) Key (x) Tx Gain (dB) M1/2 to LS Key (x) Tx Gain (dB) M1/2 to LS [0] [1] [2) [3] [4] [5] [6] [7] 30 31 32 33 34 35 36 37 [8] [9] [M1] [M2] [M3] [M4] [M5] [M6] 38 39 40 41 42 43 44 45 VLS 6 4 VLI 2 0 0 20 40 60 80 ILine (mA) 100 Figure 7: DC characteristic with low dc mask 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 kΩ. 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 Handset Tx Soft Clipping AC Impedance [0] Disabled The ac impedance of AS2525 is set to 1000 Ω. A complex impedance can be adjusted by connecting an external capacitor to the CI pin. With an external resistor of approximately 1.5 kΩ connected to the LS pin, it can be programmed to 600 Ω. [1] Enabled (2 VPEAK) ZAC(syn) = 33 ∗ 30 Ω Rev. 1.3 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. Page 9 May 1999 Preliminary AS2525 voltage at RO to 1 VPEAK. It prevents harsh distortion and acoustic shock. Table 10: Handsfree Tx gain setting [PG] + [0] + (Password) + [0] + [3] + (x) + [PG] Key (x) Tx Gain (dB) M3/4 to LS Key (x) Tx Gain (dB) M3/4 to LS [0] [1] [2] [3] [4] [5] [6] [7] 39 40 41 42 43 44 45 46 [8] [9] [M1] [M2] [M3] [M4] [M5] [M6] 47 48 49 50 51 52 53 54 Table 13: Handset Rx soft clipping selection [PG] + [0] + (Password) + [#] + [5] + (digit) + [PG] Digit Handset Rx Soft Clipping (Earpiece) [0] Disabled [1] Enabled There is LLC option for this path. The gain of the LS —> LO1/LO2 receive path is set to 29 dB. The input is differential with an impedance of 10 kΩ. The soft clip circuit limits the output voltage swing at pin LS to 2 VPEAK when activated. This gain can be changed by set-up programming from 22 dB to -37 dB in 1 dB steps. Table 11: Handsfree Tx soft clipping selection Table 14: Loudspeaker gain setting [PG] + [0] + (Password) + [0] + [4] + (x) + [PG] [PG] + [0] + (Password) + [9] + [2] + (digit) + [PG] Digit Handfree Tx Soft Clipping [0] Disabled [1] 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) Rx Gain (dB) LS to RO Key (x) Rx Gain (dB) LS to RO [0] [1] [2] [3] [4] [5] [6] [7] -6 -5 -4 -3 -2 -1 0 1 [8] [9] [M1] [M2] [M3] [M4] [M5] [M6] 2 3 4 5 6 7 8 9 Rx Gain (dB) LS to LO1/2 Key (x) Rx Gain (dB) LS to LO1/2 [0] [1] [2] [3] [4] [5] [6] [7] 22 23 24 25 26 27 28 29 [8] [9] [M1] [M2] [M3] [M4] [M5] [M6] 30 31 32 33 34 35 36 37 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 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 Rev. 1.3 Key (x) Handfree Rx Soft Clipping (Loudspeaker) [0] Disabled [1] Enabled There is optional LLC for this path. Line Loss Compensation (LLC) The line loss compensation is set-up programmable and effects only the handset mode. Page 10 May 1999 Preliminary AS2525 attenuation scheme) shows how voice switching is controlled. Table 16: Line loss compensation selection [PG] + [0] + (Password) + [0] + [5] + (digit) + [PG] Digit LLC Range [0] No LLC (gain independent of line current) [1] -1 dB/5 mA from 20 to 50 mA [2] -1 dB/5 mA from 45 to 75 mA voice switching circuit TX_atten Voice switching RX 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 speech Backgnd noise monitor Figure 9: Handsfree voice switching 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. 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] 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 Digit Background Noise Monitoring [0] Disabled [1] Enabled Gmax = +9dB Gmin = -21dB … -40dB (VOL) LINE +23dB +14dB +8dB Offset comp Compress Peak detector +3dB speech Voice switching FT2 Peak detector Compress Offset comp CTXoffset RO FT1 CBN 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 AS2525 Table 18: Handsfree attenuation scheme Speech Mode RX-gain TX-gain Remark RX > TX_atten X Receive 0 dB to -20 dB -50 dB to -30 dB adjustable with [V+]/[V-] keys in 8 steps TX_atten > RX No Idle -25 dB -25 dB middle position TX_atten > RX Yes Transmit -50 dB 0 dB independent of [V+]/[V-] keys IDLE-mode RX-mode TX-mode 0dB -10dB TX-gain -20dB Vol max Vol default Vol min -25dB -30dB RX-gain -40dB -50dB Figure 11: Gain transition of voice switching Table 20: Headset Tx gain setting 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 Loudhearing [0] Enabled (LH + HF provided) [1] Disabled (only HF is provided) Headset mode [PG] + [0] + (Password) + [0] + [7] + (x) + [PG] Key (x) Tx Gain (dB) M1/2 to LS Key (x) Tx Gain (dB) M1/2 to LS [0] [1] [2] [3] [4] [5] [6] [7] 30 31 32 33 34 35 36 37 [8] [9] [M1] [M2] [M3] [M4] [M5] [M6] 38 39 40 41 42 43 44 45 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 AS2525 Table 21: Headset Rx gain setting [PG] + [0] + (Password) + [0] + [8] + (x) + [PG] Key (x) Rx Gain (dB) LS to RO Key (x) Rx Gain (dB) LS to RO [0] [1] [2] [3] [4] [5] [6] [7] -6 -5 -4 -3 -2 -1 0 1 [8] [9] [M1] [M2] [M3] [M4] [M5] [M6] 2 3 4 5 6 7 8 9 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. 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. Rev. 1.3 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). DC/DC converter When a valid ring signal is detected, the dc/dc converter is started. Page 13 May 1999 Preliminary AS2525 5. Press [PG] (= store and exit) or go onhook to abort. 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 kΩ). This can be done using an n x m keyboard matrix with single contacts. Three diodes and a resistor are used to extend the number of rows (see Figure 4: Keyboard Layout). 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: PIN Code 1. Press [PG] to enter programme mode A PIN code is available for protection various user settings. The default PIN code is set to 1111 and can be change as follows: 2. Press [1] +(PIN) + [#] + [6] 3. Press [1] for enable or [0] for disable 1. Press [PG] to enter programme mode 4. Press [PG] (= store and exit) or go onhook to abort 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: 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 1. Press [PG] to enter programme mode 2. Press [0) + (Password) + [#] + [0] 2. Press [1) + (PIN) + [#] + [7] 3. Press [1] to reset 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. 4. Press [PG] (= store and exit) or go onhook to abort Reset to Factory Settings It is possible to reset all settings to the default factory settings with following procedure: Storing digits for call restriction: 1. Press [PG] to enter programme mode 1. Press [PG] to enter programme mode 2. Press [1] + (PIN) + [#] + [8] 2. Press [1] + (PIN) + [∗] 3. Press [1] for reset 3. Press [1] for first call restriction and [2] for second call restriction 4. Press [PG] (= store and exit) or go onhook to abort 4. Key in digits for call restriction (2 digits, [MT] for blank) Rev. 1.3 Page 14 May 1999 Preliminary AS2525 Table 22: Flash duration setting Dial Mode Selection The default signalling mode (LD or MF) is selectable through following procedure: [PG] + [0] + (Password) + [∗] + (digit) + (HEX) + [PG] Digit 1. Press [PG] to enter programme mode 2. Press [3] to enter dial select mode Timing Flash Duration [4] HEX code Flash 1 [5] HEX code Flash 2 One of two pre-programmed can be selected as follows: 3. Press [0] for LD and [1] for MF 4. Press [PG] (= store and exit) or go onhook to abort 1. Press [PG] to enter programme mode 2. Press [2] to enter flash select mode 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. 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 can also be inserted by pressing the [R/P] key in programme 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. 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. 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): 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. Rev. 1.3 Page 15 May 1999 Preliminary AS2525 Memory dialling is cascadable up to a the maximum of 31 digits/data. Table 25: Basic ringer melody selection [PG] + [0] + (Password) + [#] + [8] + (digit) + [PG] Tone Generator Digit The tone generator incorporates the DTMF tones, 3 frequencies for the tone ringer and pacifier tones. DTMF Ringer Melody [0] 2-tone [1] 3-tone The DTMF generator provides 7 frequencies. The user can chose the following melodies as shown in below table. Table 23: DTMF frequencies Table 26: 3-tone melody programming 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 Procedure Digit [PG] + [7] + 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 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 When 2-tone melody is selected through the set-up procedure, it is possible to chose the following melodies: [PG] + [0] + (Password) + [0] + [7] + (x) + [PG] Key (x) Level (dBm) Low Group Key (x) Level (dBm) Low Group [0] [1] [2] [3] [4] [5] [6] -18 -17 -16 -15 -14 -13 -12 [7] [8] [9] [M1] [M2] [M3] -11 -10 -9 -8 -7 -6 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. Table 27: 2-tone melody programming Procedure Digit [PG] + [7] + The pre-emphasis is 2.6 dB. The DTMF tones are according to CEPT recommendations. Tone Ringer (Melody/Volume) Sequence Rate [0] F1 F2 F1 F2 F1 F2 2 [1] F1 F2 F1 F2 F1 F2 5 [2] F1 F3 F1 F3 F1 F3 2 [3) F1 F3 F1 F3 F1 F3 5 [4] F2 F3 F2 F3 F2 F3 2 Press [PG] to store and terminate The tone ringer incorporates two basic selection, namely 2-tone or 3-tone melodies. The default set-up selection is the 3-tone ringer. 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 AS2525 Table 28: Pacifier tone selection 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: [PG] + [0] + (Password) + [#] + [9] + (digit) + [PG] Digit Pacifier Tone (Key-in Tone) [0] Disabled [1] Enabled • 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 Table 31: EEPROM read/write timings Key Entry Frequency Duration Acknowledge 1333 Hz 40 ms Reject/Terminate 1333 Hz 4 x 40 ms ACTION 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. DURATION After off-hook (debounced) 50 ms After on-hook (debounced) 200 ms After first rising edge at FCI 10 ms After PG is terminated 12…600 ms After pressing [V+]/[V-] 20 ms See also AS2591 data sheet for further information. Table 30: DTMF comfort tone level setting [PG] + [0] + (Password) + [0] + (y + x) + [PG] Key (y + x) Level (dBr) Earpiece Key (y + x) Level (dBr) Loudspeaker [9] + [0] [9] + [1] [9] + [2] [9] + [3] -36 -30 -24 -18 [0] + [0] [0] + [1] [0] + [2] [0] + [3] -15 -9 -3 3 Rev. 1.3 LCD Control The AS2525 is designed to work together with the LCD driver AS2591 (see also AS2591 data sheet). Page 17 May 1999 Preliminary AS2525 Electrical Characteristics Absolute Maximum Ratings* 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 +125°C Total Power Dissipation ............................................................................................................................ 500mW *Exceeding these figures may cause permanent damage. Functional operation under these conditions is not permitted. Recommended Operating Range Symbol Parameter Conditions Min. Typ.* VDD Supply Voltage (internally generated) Speech mode 3.0 5.0 V TAMB Ambient Operating Temp. Range -25 +70 °C fOSC Oscillator Frequency Resonator: Murata CSA 3.58M G312AM Max. 3.58 Units MHz * Typical figures are at 25°C 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 Parameter Conditions IDD Operating Supply Current Min. Typ. Max. Speech mode 4 6 mA Handsfree mode 11 13 mA LD dialling, VDD = 2.5V 200 µA Ring mode, VDD = 2.5V 300 µA IDD-EXT Available Supply Current for Peripheral Circuits Speech mode or MF dialling IDD0 Idle Current Idle mode, VDD = 2 V, TAMB = 25°C V Line Voltage, LIVolt = 0 13 mA< ILINE < 100 mA LI Line Voltage, LIVolt = 1 2 mA 2 µA 3.2 3.5 3.8 V 4.2 4.5 4.8 V IOL Output Current, Sink Pin CS, SS VOL = 0.4V VIL Input Low Voltage TAMB = 25°C VSS VIH Input High Voltage TAMB = 25°C 0.7 VDD Rev. 1.3 1 Page 18 Units mA 0.3 VDD V VDD V May 1999 Preliminary AS2525 AC Electrical Characteristics ILINE = 15 mA; f = 800 Hz; ZAC = 1000Ω ; recommended operating conditions and default settings unless otherwise specified. Transmit Symbol Parameter Conditions Min. Typ. Max. Units ATX Transmit Gain, default M1/M2 to LS 34.3 35.8 37.3 dB M3/M4 to LS 42.0 44.0 46.0 dB Variation with Frequency f = 500 Hz to 3.4 kHz THD Distortion VLS < 0.25 VRMS VAGC Soft Clip Level VLS = ASCO +/- 0.8 dB 2 % 2 V Soft Clip Overdrive 20 dB tDECAY Attack Time 70 µs/6dB tDECAY Decay Time 100 ms/6dB ZIN Input Impedance; M1/M2 10 kΩ Input Impedance; M3/M4 10 kΩ AMUTE Mute Attenuation Mute activated VNO Noise Output Voltage TAMB = 25°C, handset mode ATX = 37 dB VIN MAX Input Voltage Range; M1/M2 and M3/M4 Differential 60 dB -72 +/- 1 dBmp VPEAK Line Driver Symbol Parameter VIN MAX Input Voltage Range; LI +/- 2 VPEAK VTX Dynamic Range; LI +/- 2 VPEAK RL Return Loss ∆ZAC/TEMP Temperature Variation Rev. 1.3 Test Conditions ZRL = 1000 Ω; TAMB = 25°C Min. Typ. 18 Units dB 0.5 Page 19 Max. Ω/°C May 1999 Preliminary AS2525 Receive Symbol Parameter Condition Min. Typ. Max. Units ARX Receive Gain, Default LS to RO; volume reset -2.0 -0.5 1.0 dB LS to LO1/LO2; volume max. 25.0 27.0 29.0 dB ARX-VOL Volume Control Range 8 steps through [V-]/[V+] keys ∆ARX Variation with Frequency f = 500 Hz to 3.4 kHz THD Distortion, RO VRO = 0.25 VRMS 2 % Distortion, LO1/LO2 VLO1/2 = 0.25 VRMS 5 % VAGC Soft Clip Level VRO = ASCO Soft Clip Overdrive tDECAY Attack Time tDECAY Decay Time VNO Noise Output Voltage, RO TAMB = 25°C, ARX = 3 dB -72 dBmp VUFC Unwanted Frequency Components 50 Hz.........20 kHz -60 dBmp ZIN Input Impedance, RI VIN-MAX RI Input Voltage Range, RI AST Side Tone Cancellation ZIN Input Impedance, STB VIN-MAX ST Input Voltage Range, STB VRI > 0.8 VRMS 15 dB +/- 0.8 dB 1 VPEAK 10 dB 70 µs/6dB 100 ms/6dB kΩ 8 +/- 2 VRI < 0.25 VRMS VPEAK 26 dB kΩ 80 +/- 2 VPEAK General Timings Symbol Parameter td Key Debounce Time tHS-L Low/High Debounce tHS-H tFD Condition Min. Max. Units 15 ms HS Input (going off-hook) 15 ms High/Low Debounce HS Input (going on-hook) 210 ms Flash Duration FL 1 (default) 100 FL 2 (default) 275 tPFP Post Flash Pause tAP Access Pause 285 102 ms 300 ms 274 P1 (default) P2 (default) Rev. 1.3 Typ. Page 20 0.9 1.0 3.0 ms 1.1 sec. sec. May 1999 Preliminary AS2525 DTMF Symbol Parameter Condition Min. DF Frequency Deviation Deviation of ceramic resonator is not included VMF MF Tone Level at LS (Low Group) Default VMF-RANGE MF Tone Level Range at LS (Low Group) 13 steps ∆VL_H Pre-emphasis, Low to High VUFC Unwanted Frequency Components 300 Hz....4.3 kHz 4.3 kHz…7 kHz 7 kHz....10 kHz 10 kHz…14 kHz 14 kHz....28.5 kHz 28.5 kHz....40 kHz tTD Tone Duration, Minimum Default 80 82.3 85 ms tITP Inter Tone Pause, Min. Default 80 82.3 85 ms tTR Tone Rise Time From 10% to 90% amplitude 5 ms tTR Tone Fall Time From 90% to 10% amplitude 5 ms VCT Comfort Tone Level, RO Relative to LS, 4 steps Symbol Parameter Condition Min. Typ. Max. Units tDR Dialling Rate Default 9.53 10 10.5 pps -4.5 Typ. -5.5 Max. 1.2 % -6.5 dBm -18/-6 2.0 2.6 Units dBm 3.2 dBr - 40 -46 - 52 -58 - 70 - 80 dBm dBm dBm dBm dBm dBm - 36 -18 dBr LD Dialling Option t/B tM/ Break Period Make Period tPDP Pre-Digit Pause tIDP Inter-Digit Pause Rev. 1.3 20 Default 57 61.2 pps 63 ms Option 66 ms Option 33 ms Default 38 40.8 42 ms Option 33 ms Option 16.5 ms 35 ms 800 Page 21 880 ms May 1999 Preliminary AS2525 Tone Ringer Symbol Parameter F1 Condition Min. Typ. Max. Units Frequency 1 770 800 830 Hz F2 Frequency 2 1025 1067 1110 Hz F3 Frequency 3 1280 1333 1385 Hz tDT Detection Time fMIN Min. Detection Frequency 12 13 14 Hz fMAX Max. Detection Frequency 68 70 75 Hz Min. Typ. Max. Initial 100 ms Pacifier Tone Symbol Parameter Condition VPARO Tone Output Level, RO RL = 150 Ω 30 mVP-P Tone Output Level, LO1/2 RL = 32 Ω 300 mVP-P fPT Frequency Key entry 1333 Hz tTBD Tone Burst Duration Key entry 40 ms Acknowledge, terminate PG mode 140 ms Rejection, invalid key entry 4x40 ms 80 ms tITP Rev. 1.3 Inter-Tone Pause Page 22 Units May 1999 Preliminary AS2525 Timing Diagrams LD dialling MUTE MASK DPN tIDP tPDP tB tM tB tM tB tM tB tM tIDP tPDP tB tM LD dialling with access pause MUTE MASK DPN tIDP tPDP tAP tIDP Pause tPDP tB tM MF dialling MUTE MASK DPN TONE tTD tITP tTD tAP tITP tTD Pause tITP Flash MUTE MASK DPN tM tFD Flash1/2 tM tPFP tM tFD Flash1/2 tM Figure 12: Timing diagrams Rev. 1.3 Page 23 May 1999 Preliminary AS2525 Test Circuit 25 CM A CI 18 15 n 17 LS M1 1k 10 10 µ 100 µ 15 30 ohm 15 n 8 RI M2 ILINE 600 ohm 11 300 ohm UL 6k STB M3 15 n 9 1k 1µ 10 V 15 n 7 M4 B 14 LI AGND 23 10 µ 12 BC 327 CS 13 Vss OSC 33 26 SS VPP 22 µ 29 VsSA 44 AS2525 3.58 MHz 16 BC 327 CS1 43 42 27 LO1 32 ohm LO2 28 10 µ RO 100 n 19 RECI DO DI 150 ohm 21 RECV 100 n 10 k 10 µ 10 k 20 41 CLK 1 CS2 FT1 5 2 DPn 3 FT2 6 10 µ 24 10 µ HF 4 32 HS CBN LED 30 22 DM/HM VDD 31 22 µ FCI 37 C1 34 38 39 40 C2 R1 C3 R2 C4 R3 35 36 Figure 13: Test circuit Rev. 1.3 Page 24 May 1999 Preliminary AS2525 Typical Application Figure 14: Typical application Rev. 1.3 Page 25 May 1999 Preliminary AS2525 Package Outline 44 Pin TQFP See Package Catalogue 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 © 1999, Austria Mikro Systeme International AG, Schloss Premstätten, 8141 Unterpremstätten, Austria. Trademarks Registered®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. Austria Mikro Systeme Int. AG reserves the right to change or discontinue this product without notice. Rev. 1.3 Page 26 May 1999