Battery and System Health Monitoring of Battery Powered Smart Flow Meters Reference Design
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Key Document


This reference design showcases innovative solutions for battery and system health monitoring of battery-powered Smart Flow Meters.  The battery monitoring subsystem provides highly accurate energy measurement and State of Health(SOH) projections which forecast battery lifetime. The system monitoring subsystem protects against over current conditions which can dramatically reduce battery life.  The techniques demonstrated here can help extend the effective life of battery-powered meters and optimize total cost of ownership for utility operators.

  • Monitors the State-Of-Health of non-rechargeable lithium batteries
  • Accurately predicts the End-Of-Service of non-rechargeable lithium batteries
  • Low power system monitoring with ADS7142 SAR ADC and LPV521 op-amp
  • Single channel load switch to connect/disconnect system load
  • Supports Lithium Thionyl Chloride (LiSOCl2) and Lithium Manganese Dioxide (LiMnO2)
  • Low standby power consumption of 1uA for system health monitoring and 1uA for battery monitoring

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Design Files

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS7142  12-bit 140-kSPS 2-ch nanopower SAR ADC with 1.8-V operation in 1.5-mm x 2-mm QFN package  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
BQ35100  Battery fuel gauge for non-rechargeable batteries (lithium primary) and end-of-service monitor  Battery management ICs  Sample & Buy View Design Kits & Evaluation Modules
LPV521  Nanopower, 350 nA, 1.6 V RRIO Single, CMOS input op amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS22860  0.73-Ω, 5-V, ultra-low leakage load switch  Power switches  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS7142 Download Download
BQ35100 Download
LPV521 Download Download
TPS22860 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 17559 17 Jul 2018
White paper (1)
Title Type Size (KB) Date
PDF 1123 08 Jan 2019
Design files (6)
Title Type Size (KB) Date
ZIP 4726 18 Jul 2018
ZIP 42517 18 Jul 2018
PDF 617 18 Jul 2018
PDF 333 18 Jul 2018
PDF 62 18 Jul 2018
PDF 795 18 Jul 2018
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