CMX866 Datasheet | CML

Features - V.22 bis, V.22 and Bell 212A QAM/DPSK - V.23, Bell 202, V.21 and Bell 103 FSK - Integral AT mand Set with 'Fast Connect' - V.23 and Bell 202 'Fast Turnaround' - Support for Type 1 Caller Line Identification - DTMF/Programmable Tones: Transmit and Receive - 'Zero-Power' and Powersave Standby Modes - Low Power Operation Provisional Issue Applications - Telephone Telemetry Systems - Remote Utility Meter Reading - Security Systems - Industrial Control Systems - Electronic Cash Terminals / ATMs - Pay-Phones - Cable TV Set-Top Boxes - EPOS Terminals 1.1 Brief Description The CMX866 is a multi-standard modem for use in telephone based information and telemetry systems. Control of the device is via AT mands over a simple 9600b/s serial interface, patible with most types of host µController. An RS232 patible interface can be created by the addition of a Level Converter. The data transmitted and received by the modem is also transferred over the same serial interface. The on-chip µController interprets these AT mands and controls an internal DSP, which provides the modem and anciliary functions such as Ring Detection, Call Progress Detection, Hook Switch control and DTMF autodialling. User-specific DSP functions are also available via the AT mand set. Hardware support is provided for V.23 and Bell 202 Fast Turnaround and for rapid return to AT mand mode. A Fast Connect mode has been implemented to reduce modem connection time. Flexible line driver and receive hybrid circuits are integrated on chip, requiring only passive external ponents to build a 2 or 4-wire line interface. plete examples of 2-wire line interfaces to an external host µC and to an RS232 interface, including the additional ponents required for Type 1 CLI, are provided. The device features a Hook Switch relay drive output and a Ring Detector circuit that remain operational when the CMX866 is in 'Zero-Power' or Powersave mode, providing an interrupt which can be used to wake up an external host...