Energy measurement AFE; electricity meter technology for IoT applications

July 20, 2015 // By Graham Prophet
Maxim Integrated has posted details of the MAX71020A single-chip analogue front-end (AFE) for use in embedded energy measurement applications.

The part contains the compute engine (CE) found in Maxim Integrated’s fourth-generation meter system-on-chip (SoC) and an improved analogue-to-digital converter (ADC). It interfaces to a host controller of choice over a SPI interface. The MAX71020A comes in a 28-pin TQFN package.

Features include;

- Optimised embedded algorithms support highly accurate electricity measurements

Voltage, current, and frequency

Active, reactive, and apparent power/energy

Digital temperature compensation

40 Hz–70Hz line frequency range and phase compensation (±10°)

- Advanced AFE with accuracy and temperature stability

Voltage reference temperature coefficient: 40ppm/°C (max)

On-chip digital temperature sensor

24-bit 2nd order delta-sigma ADCs with differential and single-ended inputs

±0.1% Wh accuracy over 2000:1 current range

- Highly integrated features support compact design cycles and reduced bill of materials

28-Pin TQFN package

Digital Temperature compensation

Low power consumption

Less than 5mA (typ) consumption at 3.3V

Simple host interface

SPI slave

Atomic measurements outputs

DIO or SPI-Based status signals

Use the part, Maxim suggests, in building automation systems; grid-friendly appliances and smart plugs; or in power distribution units.

Maxim Integrated;