CMX813

Features:

Pre-Programmed to Decode all Major
Two-Tone, 5/6-Tone and HSC Tonesets
Low Power: 0.5mA at 2.7V typically
Superior Signal to Noise Performance
Low Cost 3.58MHz Xtal/Clock 
µC Serial Interface + TSSOP Package


Application

Two-Tone and 5/6-Tone Pagers
Selective Calling (SELCALL) Systems
Voice Pager Switching and Signalling
Revertive Paging Systems
Wireless Local Loop Signalling
Audio Tone Signalling Applications


Specifications




Description

The CMX813 decodes the signalling tones for the Motorola Quick Call series, GE groups A, B and C and the tonesets employed by the Zetron, Reach and Plectron 2-tone radio paging systems. It also decodes the tones for Motorola 5/6-tone paging and the EIA, CCIR, ZVEI1 and EEA tonesets used for HSC radio paging and SELCALL. A simple serial interface allows the host µC to specify the individual tone(s), or group of tones, to be decoded from the extensive list held by the CMX813. When the µC receives an IRQN it examines the STATUS and DECODED TONE ADDRESS Registers to reveal the tone decoded. In 2-tone mode, the CMX813
will report which of the (up to eight) selected tones it has decoded. This report is an 8-bit index number to the tone in the programmed list. For 5/6-tone or HSC groups, the CMX813 will report which tone in the selected system toneset (eg CCIR, EIA) has been decoded, as a 4-bit hexadecimal tone value within the selected group.
To allow for cadence measurements, the IRQN is activated again when the tone is no longer present. A status value of "No-tone" is returned. The CMX813 is designed to operate over a wide temperature range with a typical operating current of 0.5mA at 2.7Volts. It also has a Zero-Power mode and is available in TSSOP (E4) and DIL (P3) packages.