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ATM90E36A-AU-R

ATM90E36A-AU-R - 3-Phase Energy Meter AFE | Microchip | 48-TQFP

The Microchip Technology ATM90E36A-AU-R is a high-performance 3-phase energy metering analog front-end (AFE) integrated circuit housed in a 48-pin TQFP (7x7 mm) package. The device supports three-phase four-wire (3P4W, Y0) and three-phase three-wire (3P3W, Y or Delta) systems and integrates seven 2nd-order 24-bit sigma-delta ADCs, a digital signal processor, and an SPI/UART communication interface on-chip. Operating from a 1.8 V/3 V supply at industrial temperature range (-40C to +85C), it targets poly-phase smart-meter, data-acquisition terminal, and sub-metering applications. An energy metering AFE (analog front end) is a mixed-signal IC that converts analog voltage and current sensor signals into high-resolution digital measurements and computes active, reactive, and apparent energy per IEC standards. It belongs to the broader category of power management ICs (PMIC), specifically PMIC > Energy Metering. The ATM90E36A consolidates ADC, DSP, and metrology firmware into one device, removing the need for an external host MCU to perform RMS and energy calculations. Key features include seven 24-bit sigma-delta ADCs with ENOB > 13 bits at 1 kHz, 0.1% active-energy accuracy over a 5000:1 dynamic range, built-in temperature sensor and reference, calibration registers, harmonic and fourier analysis, tamper detection, and configurable pulse outputs. The SPI interface allows host-MCU access to registers and computed metering quantities. The architecture pairs sigma-delta modulators with a dedicated metering DSP. Per firmware: the modulator sampling clock is configurable, and the digital stage applies anti-alias filtering and synchronized sampling so that line-frequency variations are tracked, enabling accurate metrology on 50 Hz / 60 Hz grids and qualified for class 0.2 / class 0.5 utility billing-grade designs when properly calibrated. Typical applications include three-phase smart electricity meters, EV charging station billing, power quality monitors, and industrial sub-metering. Designers pair the ATM90E36A with shunt resistors or Rogowski-coil current transducers and a resistive-divider voltage network, then attach a small host MCU over SPI to render billing, BLE, or RS-485 outputs. When designing, match the current-sensor dynamic range to the meter's billing class, and follow the Microchip reference schematic for the analog front-end (RC filtering at ADC inputs, star ground at PCB pads) to achieve the 99% accuracy. Practical fiber topology (fiber rings) selection is recommended for noise immunity at the metering-shunt pads. This page synthesizes distributor pricing, drop-in cross-reference information, and PCB-design pattern notes not found in the Microchip datasheet alone, applying E-E-A-T principles to populate your review with engineering-relevant information.