austriamicrosystems Single-Chip Handsfree Phone CMOS Integrated Circuit AS2525 DATA SHEET Key Features - General Description Line/speech handsfree circuit, LD/MF repertory dialler, and tone ringer on one 44 pin CMOS chip Operating range from 15 to 100 mA line current (down to 5 mA with slightly reduced performance) All significant parameters programmable with external EEPROM 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 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. Package Available in 44 pin TQFP. Block Diagram LS 30 Ω LI AS2525 VDD FT2 AGND VDD LINE SENSE CBN FT1 M1 AGND VREF SUPPLY NOISE DET. + VDD M2 CS – VSS + M3 + SS VPP – AGND PEAK DET. M4 VPP – VSS + VOICE SWITCHING VPP CI PEAK DET. 300 Ω RI STB ZBAL VDD LO1 – LO2 + VSSA RECI HS HF RECV DTMF MELODY DEBOUNCE DM/HM RO FCI DPN CPU DIALLER KEYSCANNING LED DI DO CLK Revision 2.1 CS1 CS2 KEYBOARD (C1-4/R1-3) OSCILLATOR 3.58 MHz DC/DC CONVERTER CM Page 1 of 27 austriamicrosystems Datasheet AS2525 Pin Description Pin # Symbol Type 1 CS2 DO Description C hip S elect 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 D ial P ulse Output Digital output that holds the line during off-hook operation or pulls low during break periods of pulse dialing and flash. 3 HF DI H ands F ree Switch Input This is a Schmitt-trigger input that is pulled high to enable handsfree operation. 4 HS DI H and S et Switch Input This is a 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 M icrophone Input 4 Differential input for the handsfree microphone (electret). 8 M2 AI M icrophone Input 2 Differential input for the handset microphone (electret). 9 M3 AI M icrophone Input 3 Differential input for the handsfree microphone (electret). 10 M1 AI M icrophone Input 1 Differential input for the handset microphone (electret). 11 STB AI S ide T one B alance Input Analogue input for side tone cancellation network. 12 CS AO C urrent S hunt 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 V SS Supply V oltage S ource S ource Negative Power Supply. 14 LI AI L ine I nput Analogue input used for power extraction and line current sensing. 15 RI AI R eceive I nput Analogue input for ac-separated receive signal. 16 SS AO S upply S ource 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 L ine Current S ense Input Analogue input for sensing the line current. 18 CI AI C omplex I mpedance Input Analogue input pin for the capacitor to program a complex impedance. Revision 2.1 Page 2 of 27 austriamicrosystems Datasheet AS2525 Pin # Symbol Type 19 RECI AI Description REC eive I nput Analogue input for the handsfree receive path. Should be connected to RO via a coupling capacitor. 20 RECV AI REC eive V oice Switching Input Analogue input for receive voice switching path. 21 RO AO R eceive O utput to H andset Output for driving a dynamic earpiece with an impedance from 150 Ω to 300 Ω . 22 V DD Supply V oltage D rain D rain Positive Power Supply. 23 A GND Supply A nalogue G rou nd Special ground for the internal amplifiers. 24 CBN AI Analogue input pin for connecting a capacitor for background noise monitoring. 25 CM DO C onverter M ake Output This is an output for controlling the external switching converter. During ringing it converts the ring signal into a 4V supply voltage. 26 V PP Supply 27 28 LO1 LO2 AO 29 V SSA Supply 30 DM/HM DI Loudspeaker Power Supply High power supply for the output driver stage. L oudspeaker O utputs 1/2 Output pins for a 32 Ω ( 25 to 50 Ω ) loudspeaker. Power supply pin for LO1-LO2 output amplifier. D ial M ode/ H eadset M ode 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 FCI DI F requency C omparator I nput This is a Schmitt-trigger input for ring frequency discrimination. Disabled during off-hook. 32 LED DO LED Output Digital output for connecting 2 mA LED to indicate handsfree mode. 33 Osc illator Input OSC Input for ceramic resonator 3.58 MHz. 34 35 36 R1 R2 R3 DI/O 37 38 39 40 C1 C2 C3 C4 DI/O 41 CLK DO Keyboard R ows (see Figure 1: Keyboard Layout). Keyboard C olumns (see Figure 1: Keyboard Layout). Cl oc k Clock output for 3-wire bus. If signal is not activated, a pull down resistor (100 k Ω ) is inserted. 42 DI DI D ata I nput Data input of 3-wire bus. If signal is not activated, a pull down resistor (100 k Ω ) is inserted. Revision 2.1 Page 3 of 27 austriamicrosystems Datasheet AS2525 Pin # Symbol Type 43 DO DO Description D ata O utput Data output of 3-wire bus. A 100 k Ω resistor connected from this pin to VSS enables key locking. If signal is not activated, a pull down resistor (100 k Ω ) is inserted. 44 CS1 DO C hip S elect 1 Chip select signal for external EEPROM. If signal is not activated, a pull down resistor (100 k Ω ) is inserted. DI: DO: DI/O: Digital Input Digital Output Digital 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. Revision 2.1 AI: AO: AI/O: Analogue Input Analogue Output Analogue Input/output Keyboard Layout C1 C2 C3 1 2 3 MR V+ M1 4 5 6 PG VM2 7 8 9 R/P MT M3 M5 M6 M7 C4 ∗ 0 # FL SH R1 R2 R3 M4 M8 Figure 1: Keyboard Layout Maximum R ON for key closure: 1 k Ω Minimum R OFF for open key: 1 M Ω See “Table 1: Key definitions” for description of key functions Page 4 of 27 austriamicrosystems Datasheet 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 dialing (default LD selected) Speech mode Enter program state To enter the program state Program mode Exit program state To terminate/exit program state Speech mode Enter mute state To enter mute state Mute state Exit mute state To terminate/exit mute state Program mode Enter blank To enter blank digit during programming Redial/Pause Allows re-signaling of the last dialed number and insertion of pauses Pause Each key pressure inserts a pause Flash function Invokes a timed loop break [PG] [MT] [R/P] Program 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 (f LOW + f HIGH ) 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 dialing 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 - - Revision 2.1 Programming Mode ([PG] + Digit) Memory Location ([MR] + Digit) Memory 17 Page 5 of 27 austriamicrosystems Datasheet AS2525 Table 3: Parameter settings Parameter Symbol Procedure: [PG] + [0] + (Password) + 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 A TX-HS [0] + [1] + [HEX code] 37 dB 30 to 45 dB (see Table 8) Rx Gain, Handset A RX-HS [0] + [2] + [HEX code] 1 dB -6 to 9 dB (see Table 12) Tx Gain, Handsfree A TX-HF [0] + [3] + [HEX code] 46 dB 39 to 54 dB (see Table 10) Rx Gain, Loudspeaker A RX-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: I LINE = 20 - 50 mA [2] = range 2: I LINE = 45 - 75 mA DTMF Level (Low Group) V MF [0] + [6] + [HEX code] -6 dBm -18 to -6 dBm in 1 dB steps (see Table 24) Tx Gain, Headset A TX-HEAD [0] + [7] + [HEX code] 37 dB 30 to 45 dB (see Table 20) Rx Gain, Headset A RX-HEAD [0] + [8] + [HEX code] 1 dB -6 to 9 dB (see Table 21) MF Comfort Tone, RO V MF-CT/RO [0] + [9] + [HEX code] -30 dBr -36 to -18 dBr in 6 dB steps (see Table 30) MF Comfort Tone, LO1/2 V MF-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) V LI [#] + [3] + [1] = 4.5 Volt [0] = 3.5 Volt Tx Soft Clip (Handset) [#] + [4] + [1] = on (2 V PEAK ) [0] = off Rx Soft Clip (Handset) [#] + [5] + [1] = on (1 V PEAK ) [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 Revision 2.1 KT Default Options Page 6 of 27 austriamicrosystems Datasheet 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]=x1 (slow); [2]=x4; [3]=x8 (fast) 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 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 1 2 3 C2 4 5 6 C3 7 8 9 A (M1) B (M2) C (M3) D (M4) E (M5) F (M6) Data = 4096 - (f OSC / (512 * 12) * T (T = Time; f OSC = 3.58 MHz) Table 4: Timing selection by HEX code Parameter Default HEX Binary Data Inter-digit pause 840 ms E17 1111 0001 0111 Tone duration 82 ms FD0 1111 1101 0000 R1 Inter-tone pause 82 ms FD0 1111 1101 0000 R2 Flash 1 101 ms FC4 1111 1100 0100 R3 Flash 2 285 ms F5A 1111 0101 1010 Pause 1 1 sec DB9 1101 1011 1001 Pause 2 3 sec 92C 1001 0010 1100 Pre-digit pause 33 ms FED 1111 1110 1101 Post-flash pause 274 F60 1111 0110 0000 C4 0 [0] = disabled Figure 2: Keys for HEX-code entry Revision 2.1 Page 7 of 27 austriamicrosystems Datasheet 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 Dialing Mode 1 DM [PG] + [3] + [0] = LD (pulse) and [1] = MF (DTMF) P [PG] + [4] + [0] = Pause 1 and [1] = Pause 2 Easy Key Lock 2 [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 Bell On/Off V 33 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) Revision 2.1 Page 8 of 27 austriamicrosystems Datasheet AS2525 Memory Allocation The EEPROM memory consists of three areas: A = factory settings; B = user settings; C = stored numbers EEPROM Set-up programming A) factory settings programmed in factory "reset to factory settings" B) user settings …write/read by AS2525 User-code programming C) stored numbers 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. 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 Ω resistor between pin LI and LS. It can be calculated by the following equation: V LS = V LI + I LINE * 30 Ω VLI can be programmed to be 3.5 V or 4.5 V. VLine 8 (V) VLS 6 4 VLI 2 0 0 20 40 ILine 60 80 (mA) 100 Figure 4: 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. AC Impedance The ac impedance of AS2525 is set to 1000 Ω . A complex impedance can be adjusted by connecting an external capacitor to the CI pin. With an external resistor of approximately 1.5 k Ω connected to the LS pin, it can be programmed to 600 Ω . Z AC(syn) = 33 ∗ 30 Ω Table 7: DC mask selection [PG] + [0] + (Password) + [#] + [3] + (digit) + [PG] Digit [0] [1] Revision 2.1 DC Mask (dc voltage at pin LI) Low dc mask, VLI = 3.5 Volt High dc mask, VLI = 4.5 Volt Page 9 of 27 austriamicrosystems Datasheet AS2525 Table 10: Handsfree Tx gain setting Side-Tone A good side-tone cancellation can be achieved by using the following equation: Z BAL /Z LINE = 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 [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 The input is differential with an impedance of 10 k Ω . ZBAL R2 = 300 ohm The soft clip circuit limits the output voltage swing at pin Figure 5: Side-tone balance LS to 2 V PEAK when activated . Transmit Path Table 11: Handsfree Tx soft clipping selection 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) 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 The input is differential with an impedance of 10 k Ω . The soft clip circuit limits the output voltage swing at pin LS to 2 V PEAK 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 V PEAK ) 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. Revision 2.1 [PG] + [0] + (Password) + [9] + [2] + (digit) + [PG] Digit [0] [1] Handsfree Tx Soft Clipping Disabled Enabled (2 V PEAK ) 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 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 V PEAK . It prevents harsh distortion and acoustic shock. Page 10 of 27 austriamicrosystems Datasheet AS2525 Table 13: Handset Rx soft clipping selection Table 16: Line loss compensation selection [PG] + [0] + (Password) + [#] + [5] + (digit) + [PG] Digit [0] [1] Handset Rx Soft Clipping (Earpiece) [PG] + [0] + (Password) + [0] + [5] + (digit) + [PG] Digit [0] [1] [2] Disabled Enabled There is LLC option for this path. 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 The gain of the LS —> LO1/LO2 receive path is set to 29 dB. 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. This gain can be changed by set-up programming from 22 dB to -37 dB in 1 dB steps. Handsfree Table 14: Loudspeaker gain setting [PG] + [0] + (Password) + [0] + [4] + (x) + [PG] Key (x) 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 20 dB (8 steps, each 2.5 dB). The handsfree function allows voice communication without using the handset (full 2-way speaker phone). Two voice controlled attenuators prevent acoustic coupling between the loudspeaker and the handsfree microphone. The voice switching circuit has three states, namely idle, transmit or receive. In receive mode the attenuation of the receive path and the transmit path can be controlled by the volume keys between 0 dB and -20 dB. The following table (Table 18: Handsfree attenuation scheme) shows how voice switching is controlled. voice switching circuit TX_atten RX Voice switching speech Backgnd noise monitor 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 V PEAK . Table 15: Loudspeaker soft clipping selection Figure 6: Handsfree voice switching [PG] + [0] + (Password) + [9] + [3] + (digit) + [PG ] Digit [0] [1] Handsfree Rx Soft Clipping (Loudspeaker) A background monitoring circuit is incorporated. This Disabled Enabled circuit can be enabled/disabled as required . 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. Revision 2.1 Table 17: Background noise monitoring selection [PG] + [0] + (Password) + [#] + [6] + (digit) + [PG] Digit [0] [1] Background Noise Monitoring Disabled Enabled Page 11 of 27 austriamicrosystems Datasheet AS2525 Gmax = +9dB Gmin = -21dB … -40dB (VOL) LINE +23dB +14dB +8dB +3dB Offset comp Compress Peak detector speech Voice switching FT2 CTXoffset Peak detector Compress RO Offset comp FT1 RECV Offset comp Compress Cmicoffset CBN Peak detector CBckgnd RECI Gmax = -4dB … +16dB (VOL) Gmin = -33dB +12dB Figure 7: Signal path of handsfree circuit 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 0dB -10dB TX-mode TX-gain -20dB Vol max Vol default Vol min -25dB -30dB -40dB RX-gain -50dB Figure 8: Gain transition of voice switching Revision 2.1 Page 12 of 27 austriamicrosystems Datasheet AS2525 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 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. Ring Frequency Detection Enabled (LH + HF provided) Disabled (only HF is provided) The ring frequency detector assures that only signals with a frequency between 13 Hz and 70 Hz are regarded as valid ring signals. Headset mode Head set mode is selected by connecting pin "HEAD" to VDD and enabling the head function by service code programming (see also Table 3: Parameter settings). When a valid ring signal is present for 100 ms continuously, the melody generator is activated and remains active as long as the ring signal is present. Table 20: Headset Tx gain setting Once the melody generator has been started, the ring signal is continuously 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). [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 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) 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 Revision 2.1 Page 13 of 27 austriamicrosystems Datasheet AS2525 Dialing and Control Functions Valid Keys The key scanning is enabled in off-hook mode with V DD above V REF . A valid key is detected from the keyboard by connecting the appropriate row to the column (R ON < 1 kΩ). This can be done using an n x m keyboard matrix with single contacts. Three diodes and a resistor are used to extend the number of rows (see Figure 1: Keyboard Layout). Example 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: PIN Code 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). A PIN code is available for protecting various user settings. The default PIN code is set to 1111 and can be change as follows: Activate: [PG] + [1] + (PIN) + [1] + [0] + [PG] + [PG] + [2] + (PIN) + [1] + [9] + [PG] 1. Press [PG] to enter program mode 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] 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. 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. 3. Press [1] to reset 4. Press [PG] (= store and exit) or go on-hook to abort 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 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. 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 4. Key in digit for call restriction 2. Press [1] + (PIN) + [#] + [7] 5. Press [PG] (= store and exit) or go on-hook to abort. 3. Press [1] for clear Revision 2.1 Page 14 of 27 austriamicrosystems Datasheet AS2525 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 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 Flash Duration HEX code HEX code Flash 1 Flash 2 One of two pre-programmed can be selected as follows: Dial Mode Selection 1. Press [PG] to enter program mode The default signaling mode (LD or MF) is selectable through following procedure: 2. Press [2] to enter flash select mode 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. 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: - 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. Revision 2.1 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. 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 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. - Memory dialing is cascadable up to a the maximum of 31 digits/data. Page 15 of 27 austriamicrosystems Datasheet AS2525 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] 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] starts and stops security storing (LCD-Symbols [ and ]) inserts a pause (LCD-Symbol P) Ringer Melody 2-tone 3-tone The user can chose the following melodies as shown in below table. Tone Generator Table 26: 3-tone melody programming 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 Frequency Rows 1-2-3 4-5-6 7-8-9 Low Group 697 Hz 770 Hz 852 Hz 941 Hz ∗-0-# Columns High Group 1209 Hz 1-4-7-∗ 2-5-8-0 3-6-9-# Procedure Digit [PG] + [0] + (Password) + [0] + [6] + (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 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 [PG] + [7] + Table 24: DTMF level settings Sequence [PG] + [7] + Procedure 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. 3 The pre-emphasis is 2.6 dB. The DTMF tones are according to CEPT recommendations. Digit Sequence [0] F1 F2 [1] F1 F2 [2] F1 F3 [3) F1 F3 [4] F2 F3 Press [PG] to store 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 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. Digit includes 0 – 9, ∗ and # Revision 2.1 Page 16 of 27 austriamicrosystems Datasheet AS2525 Table 28: Pacifier tone selection Serial Bus [PG] + [0] + (Password) + [#] + [9] + (digit) + [PG] Digit [0] [1] Pacifier Tone (Key-in Tone) Disabled Enabled Table 29: Pacifier tones Key Entry Acknowledge Reject/Terminate Frequency Duration 1333 Hz 1333 Hz 40 ms 4 x 40 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. [PG] + [0] + (Password) + [0] + (y + x) + [PG] [9] [9] [9] [9] + + + + [0] [1] [2] [3] Revision 2.1 Level (dBr) Earpiece -36 -30 -24 -18 Key (y + x) [0] [0] [0] [0] + + + + [0] [1] [2] [3] - 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 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 See also AS2591 data sheet for further information. Table 30: DTMF comfort tone level setting Key (y + x) The AS2525 incorporates a microwire™ compatible serial bus (DO, DI, and CLK) with two chip select outputs (CS1 and CS2). The serial bus is used to: Level (dBr) Loudspeaker -15 -9 -3 3 LCD Control The AS2525 is designed to work together with the LCD driver AS2591 (see also AS2591 data sheet). Page 17 of 27 austriamicrosystems Datasheet AS2525 Electrical Characteristics Absolute maximum ratings -0.3 ≤ V DD ≤ 7V Positive Supply Voltage Input Current +/- 25 mA -0.3V ≤ V IN ≤ 12V Input Voltage (LS) -0.3V ≤ V IN ≤ 8V Input Voltage (LI, CS) -2V ≤ V IN ≤ V DD +0.3V Input Voltage (STB, RI) -0.3V ≤ V IN ≤ V DD + 0.3V Digital Input Voltage 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 Min. Conditions V DD Supply Voltage (internally generated) T AMB Ambient Operating Temp. Range f OSC Oscillator Frequency Speech mode Max. Units 3.0 5.0 V -25 +70 °C Resonator: Murata CSA 3.58M G312AM Typ.* 3.58 MHz * Typical figures are at 25°C and are for design aid only; not guaranteed and not subject to production testing. DC Characteristics (I LINE = 15 mA, recommended operating conditions unless otherwise specified) Symbol I DD I DD-EXT Typ. Max. Units Speech mode 4 6 mA Handsfree mode 11 13 mA LD dialing, V DD = 2.5V 200 µA Ring mode, V DD = 2.5V 300 µA Parameter Operating Supply Current Conditions Available Supply Current for Peripheral Circuits Speech mode or MF dialing I DD0 Idle Current Idle mode, V DD = 2 V, T AMB = 25°C V LI Line Voltage, LIVolt = 0 13 mA< I LINE < 100 mA Line Voltage, LIVolt = 1 Min. 2 mA 2 µA 3.2 3.5 3.8 V 4.2 4.5 4.8 V I OL Output Current, Sink Pin CS, SS V OL = 0.4V V IL Input Low Voltage T AMB = 25°C V SS 0.3 V DD V V IH Input High Voltage T AMB = 25°C 0.7 V DD V DD V Revision 2.1 1 mA Page 18 of 27 austriamicrosystems Datasheet AS2525 AC Electrical Characteristics I LINE = 15 mA; f = 800 Hz; ZAC = 1000 Ω ; recommended operating conditions and default settings unless otherwise specified. Transmit Symbol A TX Parameter Transmit Gain, default Conditions Min. Typ. Max. Units 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 V LS < 0.25 V RMS V AGC Soft Clip Level V LS = A SCO +/- 0.8 dB 2 % 2 V Soft Clip Overdrive 20 dB t DECAY Attack Time 70 µs/6dB t DECAY Decay Time 100 ms/6dB Input Impedance; M1/M2 10 kΩ Input Impedance; M3/M4 10 kΩ Z IN A MUTE V NO V IN MAX Mute Attenuation Mute activated Noise Output Voltage T AMB = 25°C, handset mode A TX = 37 dB Input Voltage Range; M1/M2 and M3/M4 Differential 60 dB -72 +/- 1 dBmp V PEAK Line Driver Symbol V IN MAX Parameter Test Conditions Min. Typ. Max. Units Input Voltage Range; LI +/- 2 V PEAK V TX Dynamic Range; LI +/- 2 V PEAK RL Return Loss ∆Z AC/TEMP Revision 2.1 Temperature Variation Z RL = 1000 Ω ; T AMB = 25°C 18 dB 0.5 Ω/°C Page 19 of 27 austriamicrosystems Datasheet AS2525 Receive Symbol A RX Parameter Receive Gain, Default Conditions Min. Typ. Max. Units 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 A RX-VOL Volume Control Range 8 steps through [V-]/[V+] keys ∆A RX Variation with Frequency f = 500 Hz to 3.4 kHz THD Distortion, RO V RO = 0.25 V RMS 2 % Distortion, LO1/LO2 V LO1/2 = 0.25 V RMS 5 % V AGC Soft Clip Level V RO = A SCO Soft Clip Overdrive t DECAY Attack Time t DECAY Decay Time V NO Noise Output Voltage, RO T AMB = 25°C, A RX = 3 dB -72 dBmp V UFC Unwanted Frequency Components 50 Hz.........20 kHz -60 dBmp Z IN Input Impedance, RI V IN-MAX RI Input Voltage Range, RI A ST Side Tone Cancellation Z IN Input Impedance, STB V IN-MAX ST Input Voltage Range, STB V RI > 0.8 V RMS V RI < 0.25 V RMS 15 dB +/- 0.8 dB 1 V PEAK 10 dB 70 µs/6dB 100 ms/6dB 8 kΩ +/- 2 V PEAK 26 dB 80 kΩ +/- 2 V PEAK General Timings Symbol Parameter td Key Debounce Time t HS-L Low/High Debounce t HS-H t FD Conditions Typ. 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 t PFP Post Flash Pause t AP Access Pause 285 102 ms 300 ms 274 P1 (default) P2 (default) Revision 2.1 Min. 0.9 1.0 3.0 ms 1.1 sec. sec. Page 20 of 27 austriamicrosystems Datasheet AS2525 DTMF Symbol Parameter Conditions Min. DF Frequency Deviation Deviation of ceramic resonator is not included V MF MF Tone Level at LS (Low Group) Default V MF-RANGE MF Tone Level Range at LS (Low Group) 13 steps ∆V L_H Pre-emphasis, Low to High V UFC 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 t TD Tone Duration, Minimum Default 80 t ITP Inter Tone Pause, Min. Default 80 t TR Tone Rise Time t TR V CT -4.5 Typ. -5.5 Max. Units 1.2 % -6.5 dBm -18/-6 2.0 2.6 dBm 3.2 dBr -40 -46 -52 -58 -70 -80 dBm dBm dBm dBm dBm dBm 82.3 85 ms 82.3 85 ms From 10% to 90% amplitude 5 ms Tone Fall Time From 90% to 10% amplitude 5 ms Comfort Tone Level, RO Relative to LS, 4 steps -36 -18 dBr LD Dialing Symbol t DR Parameter Dialing Rate Conditions Default Min. Typ. Max. Units 9.53 10 10.5 pps Option t /B t M/ Break Period Make Period t PDP Pre-Digit Pause t IDP Inter-Digit Pause Revision 2.1 Default 20 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 800 880 ms Page 21 of 27 austriamicrosystems Datasheet AS2525 Tone Ringer Symbol Parameter Conditions Min. Typ. Max. Units F1 Frequency 1 770 800 830 Hz F2 Frequency 2 1025 1067 1110 Hz F3 Frequency 3 1280 1333 1385 Hz t DT Detection Time f MIN Min. Detection Frequency 12 13 14 Hz f MAX Max. Detection Frequency 68 70 75 Hz Min. Typ. Max. Units Initial 100 ms Pacifier Tone Symbol V PARO Parameter Conditions Tone Output Level, RO RL = 150 30 mV P-P Tone Output Level, LO1/2 RL = 32 300 mV P-P f PT Frequency Key entry 1333 Hz t TBD Tone Burst Duration Key entry 40 ms Acknowledge, terminate PG mode 140 ms 4x40 ms 80 ms Rejection, invalid key entry t ITP Revision 2.1 Inter-Tone Pause Page 22 of 27 austriamicrosystems Datasheet AS2525 Timing Diagrams LD dialling MUTE MASK DPN tIDP tPDP tB tM tB tM tIDP tB tM tB tM Pause tPDP tB tM LD dialling with access pause MUTE MASK DPN tIDP tPDP tAP tIDP tPDP tB tM MF dialling MUTE MASK DPN TONE tTD tITP tTD tITP tAP Pause tTD tITP Figure 9: Timing diagrams Revision 2.1 Page 23 of 27 austriamicrosystems Datasheet AS2525 Test Circuit 25 A CM CI 17 LS 10 µ 100 µ 15 30 ohm RI ILINE M1 M2 18 15 n 10 15 n 8 600 ohm 11 300 ohm UL 6k STB M3 M4 B 14 LI 12 13 16 BC 327 15 n 9 1k 1µ 10 V BC 327 1k AGND 15 n 7 23 10 µ CS Vss OSC 33 3.58 MHz SS LO1 27 32 ohm 26 VPP LO2 28 22 µ 29 VsSA RO CS1 RECI 19 44 43 42 41 DO DI CS2 3 4 32 30 31 37 38 39 40 RECV 20 CLK 1 2 21 FT1 DPn HF HS FT2 CBN 10 µ 150 ohm 100 n 100 n 10 k 10 µ 10 k 5 6 10 µ 24 10 µ LED DM/HM VDD 22 22 µ FCI C1 34 C2 R1 C3 R2 C4 R3 35 36 Figure 10: Test circuit Revision 2.1 Page 24 of 27 austriamicrosystems Datasheet AS2525 Typical Application Figure 11: Typical application Revision 2.1 Page 25 of 27 austriamicrosystems Datasheet AS2525 Packaging Ordering Information Number Package Description AS2525 Q TQFP plastic thin quad flat package – 44 leads (suffix T) Marking, Pin-out AS2525 F DOF Dice-on-Foil CS1 DO DI CLK C4 C3 C2 C1 R3 R2 R1 44-in plastic TQFP (suffix Q) For exact mechanical package dimensions please see austriamicrosystems AG packaging information. CS2 DPn HF HS FT1 FT2 M4 M2 M3 M1 STB 1 6 39 YYWWAAA AS2525x Austria 28 CS VSS LI RI SS LS CI RECI RECV RO VDD 17 YY WW AAA year of production calendar week of production austriamicrosystems AG assembly ID X revision 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. Copyright Copyright © 1997-2002, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Revision 2.1 Page 26 of 27 austriamicrosystems Datasheet AS2525 Contact Headquarters austriamicrosystems AG Communications Business Unit A 8141 Schloss Premstätten, Austria T. +43 (0) 3136 500 0 F. +43 (0) 3136 525 01 www.austriamicrosystems.com Sales Offices Germany austriamicrosystems Germany GmbH Tegernseer Landstrasse 85 D-81539 München, Germany Phone: +49/89/693643-0 Fax: +49/89/693643-66 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 Italy austriamicrosystems Italy S.r.l. Via Leone Tolstoi, 64 I-20146 Milano, Italy Phone: +39/0242/36713 Fax: +39/0242/290889 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 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 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 USA (west) Spain, Israel, Korea, Hong-Kong, Taiwan, Malaysia, Singapore, India, Brazil austriamicrosystems USA, Inc. Suite 116, 4030 Moorpark Ave, San Jose, CA 95117, USA Phone: +1/408/345 1790 Fax: +1/408/345 1795 Revision 2.1 austriamicrosystems AG is represented by distributors in the following countries. Please contact your nearest regional sales office for the distributor address: Application Support Please contact your local sales office or your distributor. Page 27 of 27