MAXQ3183

19-4955; Rev 0; 12/09 Low-Power, Multifunction, Polyphase AFE with Harmonics and Tamper Detect General Description The MAXQ3183 is a dedicated electricity measurement front-end that collects and calculates polyphase voltage, current, power, energy, and many other metering and power-quality 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 MAXQ3183 and monitor the status of operations. The MAXQ3183 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. ♦ Phase Current THDN ♦ Fundamental and Total Power and Energy ♦ AC/DC Mode Current and Voltage Measurement ♦ Two Pulse Outputs: Configurable for Active, Reactive, and Apparent Powers ♦ Programmable Meter Constants and Pulse Widths ♦ Programmable No-Load Current Threshold ♦ Programmable Thresholds for Undervoltage and Overvoltage Detection ♦ Programmable Threshold for Overcurrent Detection ♦ Programmable Vector Sum Threshold for Bypass Detection ♦ Amp-Hours in Absence of Voltage Signals ♦ On-Chip Digital Temperature Sensor ♦ Precision Internal Voltage Reference 2.048V (30ppm/°C typic...