Low-power option for smart meter wireless module using primary cells reference design
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
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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CSD13385F5 — 12-V, N channel NexFET™ power MOSFET, single LGA 0.8 mm x 1.5 mm, 19 mOhm, gate ESD protectionData sheet: PDF | HTML
|*||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 note||How to Extend Operating Time of a LiSOCl2 Powered System||PDF | HTML||Aug. 06, 2020|
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