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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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Status
Active: In Production.
Description
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.
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Data Sheet
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Key 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 (Acitve-Low IRQ) Output
- Single 3.3V Supply, Low Power (35mW typical)
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Applications/Uses
- 3-Phase Active Energy Electricity Meters
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Key Specifications:
| Metering SoCs |
| Part Number |
Functions |
Phase |
Wh Accuracy
(%) |
Dynamic Range |
Analog Input |
Sensor Inputs (Current+Voltage) |
MCU MIPS |
ISUPPLY
(mA) |
UARTs |
Budgetary Price |
| -40 to +85°C |
max |
See Notes |
| MAXQ3181 |
Metering SoC |
3P |
0.1 |
1000:1 |
Differential |
4D + 3 |
8 |
10 |
0 |
$5.03 @1k |
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See All Metering SoCs (28)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Application Circuit
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Information Index
Document Ref.: 19-4668
Rev 1;
2009-12-14
This page last modified: 2009-12-22
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