One-phase shunt electricity meter reference design using standalone ADCs


Design files


This reference design implements Class 0.5 single-phase energy measurement using standalone multi-channel analog-to-digital converters (ADC) to sample a shunt current sensor. With the combination of the shunt sensor and a compact magnetically immune power supply, the design provides protection against magnetic tampering attacks. The design also provides the capability to detect potential tampering from neutral line disconnection. The combination of a high-performance ARM Cortex-M4 MCU to execute the metrology calculations and 8-kHz sampling rate allows the addition of power quality functions, such as individual harmonic analysis.

  • Class 0.5 single-phase metrology tested across 50-mA to 90-A input range
  • Calculated parameters include active and reactive energy and power, RMS line current, RMS neutral current, RMS voltage, power factor, and line frequency
  • Detects potential tamper attacks with low-power current detection mode
  • Compact non-magnetic power supply using active clamped capacitor-drop regulator with power good indication and supply failure alerts
  • RS-485 and RS-232 interfaces with 5kV RMS isolation
  • Complete, tested reference design with hardware files and design guide
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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


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRZM5.ZIP (14699 K)

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

TIDCFG0.ZIP (1888 K)

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

TIDRZM4.PDF (1817 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Digital isolators

ISO7720Robust EMC, dual-channel, 2/0, reinforced digital isolator

Data sheet: PDF | HTML
Digital isolators

ISO7731Robust EMC, triple-channel, 2/1, reinforced digital isolator

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS709150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS7A78120-mA, smart, capacitance-drop, low-dropout (LDO) linear voltage regulator

Data sheet: PDF | HTML
Precision ADCs

ADS131M04Four-channel, 24-bit, 64-kSPS, simultaneous-sampling, delta-sigma ADC

Data sheet: PDF
RS-232 transceivers

TRS3232E3- to 5.5-V dual channel 250kbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

Data sheet: PDF | HTML
RS-485 & RS-422 transceivers

THVD15005-V RS-485 transceiver up to 500 kbps with ±8-kV IEC ESD protection

Data sheet: PDF | HTML
Supervisor & reset ICs

TPS3840Nanopower high-input voltage supervisor with manual reset and programmable-reset time delay

Data sheet: PDF | HTML

Technical documentation

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* Design guide One-Phase Shunt Electricity Meter Reference Design Using Standalone ADCs (Rev. A) PDF | HTML Feb. 24, 2021

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