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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