Low-power option for smart meter wireless module using primary cells reference design


Design files


This reference design showcases three different power architectures for smart flow meters with lithium manganese dioxide (LiMnO2) primary batteries and commercial off-the-shelf narrowband modules for Internet of Things (IoT)-related applications. The three power solutions are combined with the Battery and System Health Monitoring of Battery Powered Smart Flow Meters Reference Design hardware, which provides highly-accurate State-of-Health (SOH) calculation for the battery lifetime. The always-on in-system current monitoring detects the current peak of the RF transmission and the SOH measurement is scheduled afterwards with an adjustable delay.  High-efficiency power architectures for supplying narrowband cellular modules for IoT-related applications with the BQ35100 battery gauge delivers real-time battery life data enabling on-demand battery replacement.

  • Accurate in-system battery gauging by utilizing the BQ35100 device capabilities
  • 1 μA always-on in-system current monitoring with adjustable high and low thresholds for various power profile states with ADS7142 + LPV521
  • Support for a single or two-in-series primary LiMnO2 cells
  • Enables overall efficiency comparison of boost, buck, or buck-boost approach
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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.


Reference design overview and verified performance test data

TIDM066A.PDF (376 K)

Detailed schematic diagram for design layout and components

TIDM067A.PDF (58 K)

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

TIDM068A.PDF (154 K)

Detailed overview of design layout for component placement

TIDM070A.ZIP (1768 K)

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


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

TIDM069A.PDF (563 K)

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)

TPS610990.7Vin Synchronous Boost Converter with 800 nA Ultra-Low Quiescent Current

Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)

TPS6284060-nA quiescent current (IQ), 1.8-V to 6.5-VIN, high-efficiency 750-mA step-down converter

Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)

TPS639001.8-V to 5.5-V, 75-nA IQ buck-boost converter with input current limit and Dynamic Voltage Scaling

Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)

TPS639015.5-V buck-boost converter with 75-nA operating IQ in WCSP package

Data sheet: PDF | HTML

CSD13385F512-V, N channel NexFET™ power MOSFET, single LGA 0.8 mm x 1.5 mm, 19 mOhm, gate ESD protection

Data sheet: PDF | HTML

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Design tools & simulation

Simulation model

TIDA-010053 Simulation — TIDM071.ZIP (12 K)

Technical documentation

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Type Title Date
* Design guide NB-IoT Power Topologies for Smart Meter Wireless Modules Using Primary Cells Ref (Rev. C) PDF | HTML Mar. 05, 2021
Application note Extending Battery Life with Low-Iq and Dynamic Voltage Scaling (Rev. A) PDF | HTML Oct. 12, 2020
Application brief How to Extend Operating Time of a LiSOCl2 Powered System PDF | HTML Aug. 06, 2020

Related design resources

Hardware development

BQ35100EVM-795 bq35100 Lithium Primary Cell Evaluation Module Using End-of-Service Monitor Gas Gauging

Software development

BQSTUDIO Battery Management Studio (bqStudio) Software

Reference designs

TIDA-01546 Battery and System Health Monitoring of Battery Powered Smart Flow Meters Reference Design

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