Battery Management and Auxiliary Power Supply Options for E-Meters
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Key Document


Smart electric meters are required to maintain normal operation for a short period of time after the electric grid fails. This reference design details methods by which designers can meet this requirement when using an advanced, smart meter MCU. Designers can use this design to evaluate options for battery management and auxiliary power supplies quickly and easily.

  • Two types of power sources for the auxiliary supply of the host MCU: independent regulator with super-cap back-up and (2) AAA batteries
  • Separate power supply for Real-time Clock
  • Automatic time capture of external events for tamper detection
  • Automated or manual switching of power supply
  • Automated power supply monitoring

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
MSP430F67791A  Polyphase metering SoC with 7 Sigma-Delta ADCs, LCD, real-time clock, 512KB Flash, 32KB RAM  Microcontrollers (MCUs)  Sample & Buy View Design Kits & Evaluation Modules
TPS770  50-mA, 10-V, low-IQ, low-dropout voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
MSP430F67791A Download
TPS770 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 18154 27 Aug 2014
Design files (5)
Title Type Size (KB) Date
ZIP 314 15 Sep 2014
ZIP 316 15 Sep 2014
PDF 83 15 Sep 2014
PDF 67 15 Sep 2014
ZIP 296 15 Sep 2014
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