Digital PMR (dPMR) Baseband Processor
CMX8341
1
Brief Description
The 8341FI-1.x Function Image™ (FI) implements a half-duplex digital PMR processor including: 4FSK
modem, a large proportion of the dPMR™ Air Interface; Physical, Data Link and Control layers, and an
embedded low bit rate RALCWI Vocoder (with no license or royalties required).
In conjunction with a suitable host and a limiter/discriminator based RF transceiver, a compact, low cost,
low power digital PMR radio conforming to ETSI’s dPMR standard TS 102 490 can be realised. Both ISF
and CSF configurations are supported, including built-in support for BCD addressing modes. Dual mode,
analogue/digital PMR operation can also be achieved with the CMX8341. The device is also compatible
with ETSI’s dPMR standard TS 102 658 for Mode 1 operation.
The embedded functionality of the CMX8341, managing voice and data systems autonomously including
the Vocoder minimises host microcontroller interactions enabling the lowest operating power and therefore
the longest battery life for a dPMR radio.
The CMX8341 utilises CML’s proprietary
FirmASIC
component technology. On-chip sub-systems are
configured by a Function Image™: this is a data file that is uploaded during device initialisation and defines
the device's function and feature set. The Function Image™ can be loaded automatically from an external
serial memory or host µController over the built-in C-BUS serial interface. The device's functions and
features may be enhanced by subsequent Function Image™ releases, facilitating in-the-field upgrades.
This document refers specifically to the features provided by Function Image™ 8341 FI-1.x.
Other features include two auxiliary ADCs with four selectable inputs and four auxiliary DAC interfaces
(with an optional RAMDAC on the first DAC output, to facilitate transmitter power ramping).
The device has flexible powersaving modes and is available in the L8 (LQFP) package.
This Datasheet is the first part of a two-part document comprising Datasheet and User Manual: the User
Manual can be obtained by registering your interest in this product with your local CML representative.
Text in grey may be implemented in later versions of the Function Image™ 8341 FI-1.x.
dPMR is a registered trademark of the dPMR Association
2014 CML Microsystems Plc
2
D/8341/7
CMLMICRO [ CML MICROCIRCUITS ]
