ETSI Cat2 Receiver Capable wM-Bus 868 MHz RF Subsystem for Smart Utility Meter & Heat Cost Allocator


Design files


This reference design describes an ETSI Cat. 2 receiver-capable RF subsystem for smart meters, fully compliant with the most popular wM-Bus S, T and C-modes at 868 MHz as per EN13757-4:2014. The SimpleLink RF transceiver device delivers market leading blocking, selectivity and RX sensitivity numbers in wM-Bus applications, such as bi-directional flow meters, e-meters and heat cost allocators. This cost-optimized design handles the worst case frequency offset of +-60ppm in S2-mode by utilizing an inexpensive XTAL component. Neither an external SAW filter nor costly TCXO component are needed to meet the specification of the wM-Bus modes @ 868 MHz. Additionally, this design uses a ultra-low Iq DC/DC converter with dynamically adjustable output voltage, enables a new level of optimization of the design's power consumption, significantly extending the battery lifetime.

  • Market leading blocking, selectivity and RX sensitivity subsystem for wM-Bus at 868MHz
  • Fully compliant with the wM-Bus requirements for S2, T2-Meter and C2-Meter modes
  • DC/DC converter with adjustable Vout and 360nA Iq current
  • No costly SAW filter and TCXO required
  • Two pin-compatible IPC options for Balun + Matching available
  • This circuit design is tested and includes test firmware, SRF7 Studio GUI configuration files and getting started guide
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Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU582.PDF (1882 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement


Files used for 3D models or 2D drawings of IC components

TIDC741.ZIP (109 K)

Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

TPS627402.2V-5.5V input, ultra-low-power 300mA step-down buck DCDC converter with 360nA Iq

Data sheet: PDF | HTML
Sub-1 GHz transceivers

CC1200Low power and high performance wireless transceiver

Data sheet: PDF | HTML

Start development


Daughter card

CC1200EMK-868-930 — CC1200 Evaluation Module Kit 868-930 MHz

The CC1200 Evaluation Module Kit for 868-930 MHz can be used in conjunction with the CC1200 Development Kit to evaluate the operation of the CC1200 in the mentioned frequency range. The CC1200DK is required for operation and needs to be ordered separately.

User guide: PDF
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Technical documentation

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* Design guide wM-Bus Smart Meter Subsystem at 868 MHz Design Guide Oct. 17, 2014

Related design resources

Software development

WMBUS Wireless M-bus protocol software

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