OCM-22

www.DataSheet4U.com Product Brief Rev 1.0 April 2005 OCM-22 One-Chip Modem for Embedded Applications Features ■ Introduction OCM-22 is a low-cost modem solution for low-speed embedded applications. OCM22 includes a simplified AT command set and supports data rates from 300 bits/s (V.21) to 2400 bits/s (V.22bis) and only requires a CSP1034 or CSP1035A to make a complete modem. OCM-22 provides a choice of two system interfaces, a serial interface or an 8-bit parallel interface. The serial interface can be used in systems that have an available serial port. In other systems, the parallel interface can be I/O or memory mapped onto typical processor buses. In typical applications, OCM-22 is paired with Agere's CSP1035A silicon DAA to implement a low-cost worldwide modem. OCM-22 can also be used with Agere's CSP1034 line codec for traditional transformer-based DAA designs. Controller and data pump in a single 48-pin TQFP with two integrated peripheral interfaces: — Partial ISA (8-bit parallel). — RS232. Data mode capabilities range: — V.22bis: 2400 bits/s. — V.22: 1200 bits/s. — V.23: 1200/600 bits/s. — V.21: 300 bits/s. — Bell 212A: 1200 bits/s. — Bell 103: 300 bits/s. Serial DTE interface: — Hardware and software flow control. — Asynchronous data format: 19,200 bits/s, 8-bit data, no parity, 1 stop bit. Parallel DTE interface for connection to system I/O or memory bus. DAA support: — CSP1035A silicon DAA. — CSP1034C with transformer DAA. Supports low-cost, call-progress speak...