General Description

The MAXQ3180 is a dedicated electricity measurement

front-end that collects and calculates polyphase volt-

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

and power-quality parameters of a polyphase load. The

computed results can be retrieved by an external mas-

ter through the on-chip serial peripheral interface

(SPI™) bus. This bus is also used by the external mas-

ter to configure the operation of the MAXQ3180 and

monitor the status of operations.

The MAXQ3180 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 Multifunction Electricity Meters

Remote Terminal Unit (RTU) Applications for

Electric Load Management

Features

♦ Supports IEC 60687, IEC 61036, and IEC 61268

Standards

♦ Compatible with 3-Phase/3-Wire, 3-Phase/4-Wire,

and Other 3-Phase Services

♦ Calculates Active/Reactive/Apparent Energy, RMS

Voltage, RMS Current, Voltage Phasor Angle, and

Line Frequency

♦ Less Than 0.1% Active Energy Error Over a

Dynamic Range of 1000:1 at +25°C

♦ Less Than 0.2% Reactive Energy Error Over a

Dynamic Range of 1000:1 at +25°C

♦ Better Than 0.5% Accuracy for RMS Voltage and

RMS Current

♦ Two Pulse Outputs: One for Active Power and

One Selectable Between Reactive and Apparent

Power

♦ Programmable Pulse Width

♦ Programmable Startup Current Threshold

♦ Programmable Meter Constant

♦ Up to 21st Harmonic Measurement

♦ Neutral Line Current Measurement

♦ Calculates Amp-Hours in the Absence of Voltage

Signals

♦ On-Chip User-Programmable Thresholds for Line

Voltage Undervoltage and Overvoltage Detection

♦ On-Chip Digital Integrator Enables Direct

Interface-to-Current Sensors with di/dt Output

♦ On-Chip Digital Temperature Sensor

♦ Precision Internal Voltage Reference 2.048V

(30ppm/°C Typical); Also Supports an External

Voltage Reference Input

♦ Active Energy of Each Phase and Combined

3-Phase (kWh), Positive and Negative

♦ Active Power of Each Phase and Combined

3-Phase (kW)

♦ Reactive Energy of Each Phase and Combined

3-Phase (kVarh), Quadrants 1 to 4

♦ Reactive Power of Each Phase and Combined

3-Phase (kVar)

♦ Apparent Energy of Each Phase and Combined

3-Phase (kVAh)

♦ Apparent Power of Each Phase and Combined

3-Phase (kVA)

♦ Line Frequency (Hz)

♦ Power Factor

♦ Overcurrent and Overvoltage Detection

♦ Voltage Sag Detection

♦ RMS Current and RMS Voltage

♦ Line-Cycle-Wise Instant Current, Voltage, and

Power

♦ Phase Sequence Error Detection

♦ Phase Voltage Absence Detection

♦ 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 (10mW Typical)

♦ 28-Pin TSSOP Package

Low-Power, Multifunction, Polyphase AFE

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

Rev 0; 2/08

+

Denotes a Pb-free/RoHS-compliant package.

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.

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

PART

TEMP RANGE

PIN-

PACKAGE

MAXQ3180-RAN+

-40

°C to +85°C

28 TSSOP

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

SPI is a trademark of Motorola, Inc.

Pin Configuration and Typical Application Circuit appear at

end of data sheet.