AS2525B ams

austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams sales ams.com Please visit our website at www.ams.com austriamicrosystems Single-Chip Handsfree Phone CMOS Integrated Circuit DATA SHEET AS2525 Key Features General Description - Line/speech handsfree circuit, LD/MF repertory dialler, The AS2525 is a CMOS mixed-mode integrated circuit for and tone ringer on one 44 pin CMOS chip use in feature phones, answering machines and fax - Operating range from 15 to 100 mA line current (down machines. It contains an analogue line interface and to 5 mA with slightly reduced performance) speech circuit for a/b terminals, loudhearing, handsfree, - All significant parameters programmable with external enhanced LD/MF dialler, tone ringer with dc/dc converter EEPROM and serial interface to EEPROM and LCD-driver (AS2591), - Volume control of receiver signal all in a 44 pin package. The circuit is fully line powered. - Handsfree function with enhanced voice switching - Low noise (max. -72 dBmp) The AS2525 uses an external EEPROM for a 32 digit last - Unique EMC performance number redial storage and memories for 28 numbers each - LD/MF switchable dialing with temporary MF mode containing up to 24 digits/data. - Repertory dialing with last number redial and memory dialing (8 x 2 direct and 12 indirect) The device provides a volume control for the earpiece and - Call restriction with PIN code the loudspeaker. The volume can be controlled by pressing - Serial interface for EEPROM and LCD driver the V- / V+ keys. - 2-tone/3-tone ringer with ring frequency detection The versatility of the circuit is provided by programming all parameters through an external EEPROM. This allows easy Package adaptation to various PTT requirements worldwide. Available in 44 pin TQFP. Block Diagram LS V FT2 A CBN FT1 DD GND M1 V A DD GND V AS2525 DD 30 LI LINE NOISE SUPPLY V REF SENSE DET. + M2 CS + M3 SS + V A DD GND PEAK DET. V M4 PP V PP VOICE V SS SWITCHING V SS + V CI PP LO1 PEAK 300 DET. RI LO2 STB V + SSA RECI Z BAL HS RECV DTMF HF DEBOUNCE MELODY DM/HM RO FCI CPU DPN DIALLER DC/DC KEYSCANNING OSCILLATOR CONVERTER LED DI DO CLK CS1 CS2 CM KEYBOARD (C1-4/R1-3) 3.58 MHz Revision 2.1 Page 1 of 27 ams AG Technical content still valid