Battery-powered Data Collector for wM-Bus T-/C-mode & DSSS-coded Data Packets @ 868.95MHz Ref Design
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Key Document


TIDC-DSSS868WMBUS-DC enables data collectors with optimized firmware for receiving wireless M-Bus (wM-Bus) packets in frequent transmission (T-) and compact (C-) modes at 868.95 MHz. For improved range, a customized direct sequence spread spectrum (DSSS)-coded packet reception is also supported. This reference design can be adapted for wM-Bus and DSSS-enabled data collectors and mobile readers at 169-MHz and 433-MHz bands.

  • Battery-powered data collector (or Mobile reader) for wM-Bus T- and C-mode or DSSS-coded data packets
  • 10 Vin ultra-low Iq DC/DC supports multiple battery types, configurations and chemistries.
  • Market leading blocking, selectivity and RX sensitivity in wM-Bus T-mode with +-12% data rate variation with 100 kcps @ 868.95 MHz for a robust wireless design
  • EN13757-4 T- and C-mode compliant "other" device with open source code examples for receive operation
  • 11-bits (and 16-bits) DSSS-coding of data supported in hardware
  • This ultra low-power, battery-operated data collector system is tested and includes open source licensed firmware. It also includes SRF7 studio GUI configuration files and user's guide and our sub-1 GHz transceiver, MSP430 microcontroller and ultra-low Iq step--down converter.

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Schematic/Block Diagram

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Design Guide

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CC1125  Ultra-high performance Sub-1 GHz wireless transceiver for narrowband systems  Wireless connectivity  Sample & Buy View Design Kits & Evaluation Modules
MSP430F5438A  25-MHz MCU with 256-KB flash, 16-KB SRAM, 12-bit ADC, DMA, UART/SPI/I2C, timer, HW multiplier  Microcontrollers (MCUs)  Sample & Buy View Design Kits & Evaluation Modules
TPS62745  3.3V-10V input, 300mA Ultra Low Iq step-down converter with VSEL and input voltage switch  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CC1125 Download
MSP430F5438A Download
(ZQW) | 113 Download -
TPS62745 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 2992 26 May 2017
Design files (6)
Title Type Size (KB) Date
ZIP 103 30 Jun 2015
ZIP 343 30 Jun 2015
PDF 237 30 Jun 2015
ZIP 39 30 Jun 2015
PDF 52 30 Jun 2015
PDF 46 30 Jun 2015
Related Tools & Software

Software development (2)

Name Part Number Software Type
Wireless M-Bus Protocol Software  WMBUS  Application software & framework 

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