MAXQ3181

Low-Power, Active Energy, Polyphase AFE

Not Ready for a Multifunction Design? The MAXQ3181 Provides Active Energy Metering, but is Pin Compatible with the MAXQ3180!

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Overview

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 (Acitve-Low IRQ) Output
Single 3.3V Supply, Low Power (35mW typical)

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.

The MAXQ3181 performs voltage and current measurements using an integrated ADC that can measure up to seven external differential signal pairs. An eighth differential signal pair is used to measure the die temperature. An internal amplifier automatically adjusts the current channel gain to compensate for low-current channel-signal levels.

Applications