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TIDA-00838

Heat Cost Allocator with wM-Bus at 868 MHz Reference Design

Design files

TIDA-00838

Design files

Overview

The TIDA-00838 reference design implements a heat cost allocator system following the EN834 standard with the “two-sensor measurement method". The solution achieves better than 0.5 degrees Celsius accuracy across a range of +20 to +85°C. Two analog temperature sensors are available as matched pairs to eliminate the need for calibration during manufacturing and lowering OEM system cost. Wireless MCU offers wM-Bus support for S-, T- and C-modes (Meter device) at 868MHz and controls the two temperature sensors.

Features
  • Highly accurate temperature sensing across environment conditions: better than 0.5 degrees from +20 to +85°C.
  • CC1310 SimpleLink(TM) Wireless MCU provides single-chip solution for heat measurement and RF communications
  • Sensor Controller interfaces seamlessly to two matched LMT70A, which eliminate the need for calibration during manufacturing and lower OEM system cost
  • Example source code for wM-Bus @868 MHz transmission for S, T and C-modes (“Meter” device) under TI RTOS
  • Cost-optimized 2-layer PCB in HCA form factor and a 96-segments 4-MUX LCD
  • Cap Touch button on the PCB for LCD on/off
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

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

download Design guide — TIDA-00838
TIDUB48.PDF (1785 K)

Reference design overview and verified performance test data

download Schematic — TIDA-00838
TIDRJQ9.PDF (476 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIDA-00838
TIDRJR0.PDF (98 K)

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

download Assembly drawing — TIDA-00838
TIDRJR1.PDF (224 K)

Detailed overview of design layout for component placement

download CAD/CAE symbol — TIDA-00838
TIDRJR4.ZIP (983 K)

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

download Gerber file — TIDA-00838
TIDCBN8.ZIP (587 K)

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

download PCB layout — TIDA-00838
TIDRJR2.PDF (1670 K)

PCB layer plot file used for generating PCB design layout

download PCB layout — TIDA-00838
TIDRJR3.PDF (2218 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Analog temperature sensors

LMT70A — ±0.1°C Matching Accuracy Precision Analog Temperature Sensor

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430FR4133 — 16 MHz MCU with 16KB FRAM, 2KB SRAM, 10-bit ADC, LCD, UART/SPI/I2C, IR logic, timer

Data sheet: PDF | HTML
Sub-1 GHz wireless MCUs

CC1310 — SimpleLink™ 32-bit Arm Cortex-M3 Sub-1 GHz wireless MCU with 128kB Flash

Data sheet: PDF | HTML

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Software

Technical documentation

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Type Title Date
* Design guide Heat Cost Allocator With wM-Bus at 868 MHz Design Guide Jan. 21, 2016
Application note Wearable Temp-Sensing Layout Considerations Optimized for Thermal Response (Rev. B) Oct. 23, 2018
White paper RTOS Power Management Emerges as a Key for MCU-based IoT Nodes (Rev. A) May 11, 2017
Technical article Sub-1 GHz + Bluetooth® low energy and low-power MCUs help make meter reading autom PDF | HTML Sep. 23, 2016

Related design resources

Software development

APPLICATION SOFTWARE & FRAMEWORK
WMBUS — Wireless M-bus protocol software

Reference designs

REFERENCE DESIGN
TIDA-00646 — Matched Precision Temperature Sensing Reference Design for Heat Cost Allocators TIDM-FRAM-WATERMETER — Low-Cost Water Meter Implementation with FRAM Microcontroller Reference Design

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