General Description

The MAXQ3181 is a dedicated electricity measurement front-end that collects and calculates polyphase voltage, current, active power and energy, and many other metering parameters of a polyphase load. The computed results can be retrieved by an external master through the on-chip serial peripheral interface (SPI™) bus. This bus is also used by the external master to configure the operation of the MAXQ3181 and monitor the status of operations.

Features

♦ Compatible with 3-Phase/3-Wire, 3-Phase/4-Wire, and Other 3-Phase Services

♦ 0.1 Active Power and Energy Linearity Error

♦ 0.5 Apparent Power and Energy Linearity Error

♦ 0.5 Linearity Errors for RMS Voltage and RMS Current

♦ Neutral Line Current Measurement

♦ Line Frequency (Hz)

♦ Power Factors

♦ Phase Sequence Indication

♦ Phase Voltage Absence Detection

♦ Programmable Pulse Width

♦ Programmable No-Load Current Threshold

♦ Programmable Meter Constant

♦ Programmable Thresholds for Undervoltage and Overvoltage Detection

♦ Programmable Threshold for Overcurrent Detection

♦ Amp-Hours in Absence of Voltage Signals

♦ On-Chip Digital Temperature Sensor

♦ Precision Internal Voltage Reference 2.048V (30ppm/°C typical), Also Supports An External Voltage Reference

♦ Active Power and Energy of Each Phase and Combined 3-Phase (kWh), Positive and Negative

♦ Apparent Power and Energy of Each Phase and Combined 3-Phase

♦ Supports Software Meter Calibration

♦ Up to 3-Point Multipoint Calibration to Compensate for Transducer Nonlinearity

♦ Power-Fail Detection

♦ Bidirectional Reset Input/Output

♦ SPI-Compatible Serial Interface with Interrupt Request (IRQ) Output

♦ Single 3.3V Supply, Low Power (35mW typical)

Applications

    3-Phase Active Energy Electricity Meters