MAXQ3181 Datasheet PDF - Maxim Integrated Products

Maxim Integrated Products

Part Number MAXQ3181
Description Polyphase AFE
Page 30 Pages

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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.
3-Phase Active Energy Electricity Meters
Ordering Information
MAXQ3181-RAN+ -40°C to +85°C
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration and Typical Application Circuit appear at
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
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:
________________________________________________________________ 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

MAXQ3181 datasheet pdf
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