DALLAS SEMICONDUCTOR DS2245M Soft Modem w/MNP FEATURES @ Bell 212A/103 and CCITT V.22bis/V.22/V.21 @ Fullduplex operation 2400, 1200, 300 bps @ MNP-5 error correction/data compression Error-free transmission on noisy lines @ Up to 200% throughput enhancement from data com- pression Speed matching with flow control DTE speed up to 9600 bps Optimized AT command interpreter @ Automatic call for help Reprograms Dallas Semiconductor Softeners Generates and interprets DTMF tones Auto-answer and originate modes Parallel interface connects to PC or other bus e +5V only operation Low-power operation consumes under 400 mW e Extremely small form-factor Pin-compatible with DS2245 @ 30-pin SIMM connection scheme DESCRIPTION The DS2245M Soft Modem with MNP is a data commu- nications subsystem which forms a complete 2400/1200/300 bps modem when combined with the DS2249 DAA. Embedded software in the DS2245M is capable of sophisticated error correction and data com- pression using MNP level ..This software allows the DS2245M to negotiate with the remote modem in order todetermine the highest level of protocol that is mutually supported. The DS2245M supports V.22bis, V.22/V.21 and Bell 212A/103 standards. In addition to industry- standard commands and MNP-5, the Soft Modem pro- PIN ASSIGNMENTS oO Oo 1 30 BODODQODN000000000000000000000 ORDERING INFORMATION : DS2245M-24 2400 bps MNP modem DS2245ML-24 2400 bps MNP modem, w/no DTMF detection PIN NAMES 1 CP.2 16 D7 2 CP.1 17 D 3 OH 18 WR 4 Ri 19 D5 5 SPEN 20 RD 6 CP3 21 AIN 7 CP.0 22 NC 8 D4 23 A2 9 D3 24 Ai 10 D2 25 AO 11 D1 26 OUT1 12 vcc 27 UR 13 DO 28 AOQUT 14 GND 29 INT 16 cs 30 PROG vides decoding of incoming DTMF tones. This allows a host system to accept commands from a remote site where a modem is not available. The DS2245M is opti- mized for embedded applications that require reliable communication and for which an AT command setis de- sired. A unique Teleservicing mode allows a central lo- cation to dial up the remote system and examine, edit, or reload the progranvdata memory contents of that sys- tem. The DS2245M is also capable of initiating a call for help when using a Dallas Semiconductor Softener and reloading the soft processor by phone. 061291 1/1 15-6