Product category:
Communications ICs (Wired)
News Release from: CML Microcircuits | Subject: CMX850
Edited by the Electronicstalk Editorial
Team on 11 February 2004
More features for frugal wireline comms
controller
CML has enhanced the facilities and improved the performance of its CMX850 single-chip communications controller.
CML has enhanced the facilities and improved the performance of its CMX850 single-chip communications controller CML believes this powerful communications processor IC to be the first embedded microcontroller of its kind with integrated V22bis modem and comprehensive wireline signalling facilities
This article was originally published on Electronicstalk on 19 Mar 2004 at 8.00am (UK)
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For use in embedded systems, either side of the telephone galvanic barrier this extremely compact and low-power microcircuit will satisfy all of the design, communications, control, data and signalling requirements of any wireline end-product using online communications.
Added sensitivity to the on-chip CAS tone detector and the addition of a stand-alone FSK demodulator not only enhance the operation to both type I and II caller line ID (CLI) operations but will allow on-hook CLI operations to take place while the remainder of the circuitry is in power-save mode - an enormous bonus to battery/line powered terminals.
As another cost saving addition, the programmable Tx DTMF twist feature allows the use of this device with lower-cost DAA circuits.
A boot ROM on-chip is available to allow both dynamic in-circuit programming and software upgrading in the field.
The CMX850 is an enhanced 80C51 microcontroller with 8Kbyte of on-chip RAM, an integral modem capable of working to V22bis, V22, V23, V21 (and Bell equivalents), and up to 35 general purpose I/O pins to form a powerful and versatile communications processor.
It is capable of directly accessing up to 4Mbyte of external memory through page-mode addressing.
Other main features include: a 16 x 8 keyboard encoder, an interface for an external LCD controller, CAS Tone detection and generation, and advanced power management.
Dual clock operation, a watchdog timer, real-time clock, two-input ADC and two low-power PWM outputs are additional features included in the highly compact CMX850.
Some of the many applications envisaged for the CMX850 are: SMS and ADSI terminals, telemetry and meter reading systems, security systems, feature phones, least cost routers, EPOS terminals and e-mail and Internet appliances.
Fully functional in the range 3.0 to 3.6V, this product typically requires only 6.5mA at full operation.
The power efficiency is infinitely variable in line with dynamic demands, with a power-save requirement of 20uA.
The CMX850 is available in a 100-lead low-profile quad flatpack.
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