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MAXQ3181

Low-Power, Active Energy, Polyphase AFE

Maxim Integrated 

19-4668; Rev 1; 12/09

Low-Power, Active Energy, Polyphase AFE

General Description

The MAXQ3181 is a dedicated electricity measurement

front-end that collects and calculates polyphase volt-

age, current, active power and energy, and many other

metering parameters of a polyphase load. The comput-

ed 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 measure-

ments using an integrated ADC that can measure up to

seven external differential signal pairs. An eighth differ-

ential signal pair is used to measure the die tempera-

ture. An internal amplifier automatically adjusts the

current channel gain to compensate for low-current

channel-signal levels.

Applications

3-Phase Active Energy Electricity Meters

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAXQ3181-RAN+ -40°C to +85°C

28 TSSOP

+Denotes a lead(Pb)-free/RoHS-compliant package.

Pin Configuration and Typical Application Circuit appear at

end of data sheet.

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)

MAXQ is a registered trademark of Maxim Integrated Products, Inc.

SPI is a trademark of Motorola, Inc.

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be

simultaneously available through various sales channels. For information about device errata, go to: www.maxim-ic.com/errata.

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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