AMR magnetometer

Overview

Memsic's magnetometers are 3-axis sensors based on anisotropic magnetoresistive (AMR) technology. Memsic says that, compared with Hall-based magnetometers, AMR gives higher accuracy, lower noise and lower temperature drift. A built-in SET/RESET function degausses the sensor and removes temperature-induced offset, so the sensor needs less frequent recalibration after exposure to strong magnets.

Built for

Electronic compass and navigation
Smartphones, tablets and wearables
Position sensing
General magnetic field measurement

Key features

AMR sensing

Magnetoresistive sensing offers a high signal-to-noise ratio and low temperature drift compared with Hall-based magnetometers.

SET/RESET degaussing

Built-in SET/RESET clears residual magnetization from strong external fields and cancels thermal offset.

Heading accuracy

Parts are specified for heading accuracy of about 1°, and the MMC5983MA is specified for 0.5°.

Wafer level packages

The smallest parts come in WLP packages of about 0.8 x 0.8 x 0.4 mm.

I2C, I3C and SPI

All parts have I2C, with I3C on the MMC5616WA-E and MMC5633NJL and SPI on the MMC5983MA.

On-chip compensation

Parts include on-chip sensitivity compensation, and most include a temperature sensor.

Specifications

Technology: AMR (anisotropic magnetoresistive)
Axes: 3
Full scale range: ±8 G to ±30 G, by part
Resolution: Up to 20-bit, 0.0625 mG/LSB
RMS noise: 0.4 to 2 mG, by part
Heading accuracy: 0.5° to 1°, by part
Interface: I2C, plus I3C or SPI on some parts
Supply: 1.62 to 3.6 V on most parts
Power down current: 1 µA
Smallest package: 0.8 x 0.8 x 0.4 mm WLP
Degaussing: Built-in SET/RESET

Part numbers (link to datasheets)

Part	Range	Resolution	RMS noise	Heading accuracy	Max rate	Interface	Package	Supply	Notes
MMC5616WA-E	±30 G	20-bit, 0.0625 mG/LSB	2 mG	±1°	1 kHz sensor response	I2C, I3C	WLP 0.82 x 0.82 x 0.4 mm	1.7 to 3.6 V	16 x 16-bit FIFO, automatic degaussing
MMC5983MA	±8 G	18-bit	0.4 mG	0.5°	1000 Hz ODR	I2C, SPI	LGA 3.0 x 3.0 x 1.0 mm	3.0 V	Automotive grade
MMC3416xPJ	±16 G	16/14-bit, 0.5/2 mG/LSB	1.5 mG	±1°	800 Hz ODR (12-bit mode)	I2C	BGA 1.6 x 1.6 x 0.6 mm	1.62 to 3.6 V	Multiple I2C addresses, 140 µA at 7 Hz
MMC3630KJ	±30 G	16-bit, 1 mG/LSB	2 mG	1°	600 Hz ODR	I2C	BGA 1.2 x 1.2 x 0.5 mm	1.8 V	Motion detection interrupt
MMC5603NJ	±30 G	20-bit, 0.0625 mG/LSB	2 mG	1°	1 kHz sensor response	I2C	WLP 0.8 x 0.8 x 0.4 mm	1.62 to 3.6 V	Automatic degaussing, self-test
MMC5633NJL	±30 G	20-bit, 0.0625 mG/LSB	2 mG	±1°	1 kHz sensor response	I2C, I3C	WLP 0.8 x 0.8 x 0.4 mm	1.62 to 3.6 V	Automatic degaussing, self-test