Introduction of MEMSIC Magnetic Sensor Solution

MEMSIC Confidential Property Agenda Background Knowledge MEMSIC Magnetic Sensor Solution Advantage of MEMSIC Magnetic Sensor Application Solution (Cellphone) 9/5/2018 MEMSIC Confidential Property

Background Knowledge

MEMSIC Confidential Property The Magnetic Effect Magnetic, a basic physical effect Magnetic field can be generated by magnet or electrical circuit. Magnetic field directs from Magnetic North to South. Like magnet repel each other, unlike magnet attract. 9/5/2018 MEMSIC Confidential Property

Earth’s Geomagnetic Field General Earth’s Surface: H= 48 A/m (0.6 Oe) B = 0.6 x 10-4 Tesla (0.6 Gauss) 9/5/2018 MEMSIC Confidential Property

Geomagnetic Field & Compass for Orientation Geomagnetic field behaves like there is a big “magnet” inside the earth. Geomagnetic north pole is near earth’s South pole, geomagnetic south pole is near earth’s north pole. Compass is a small piece of magnet, attracted by geomagnetic field. Mag north heads earth’s north, mag south heads south. 9/5/2018 MEMSIC Confidential Property

How to feel/detect Geomagnetic Field Traditional mechanical Compass & related tools Electronics devices, MEMS Sensor technology Traditional mechanical tools New MEMS sensor technology 9/5/2018 MEMSIC Confidential Property

Geomagnetic Inclination & Orientation Projection Geomagnetic field is not constant all around the world, and normally neither vertical nor horizontal. Northern Hemisphere the field points DOWN, Southern Hemisphere the field points UP, quarter is almost vertical. A 3D Mag sensor is measuring the 3D vector geomagnetic filed, need be projected to a 2D vector in the ground plane to indicate the orientation. 9/5/2018 MEMSIC Confidential Property

MEMSIC Magnetic sensor Technology

MEMSIC Magnetic Sensor Based on Anisotropic Magneto-Resistive (AMR) technology Fully integrated sensors with minimal external components Measures full range of ±4 gausses Linear biasing Small, low-profile packaging Power up/down function available through I2C interface 13 bit ADC, 512 counts/gauss resolution (2mGauss/LSB) I2C Slave, FAST (≤400 KHz) mode Low Power Consumption MMC314x Tri-axis Magnetic Sensor: Typically 0.55mA@3V with 50 measurements per second 9/5/2018 MEMSIC Confidential Property

MEMSIC Magnetic Sensor MMC314x Tri-Axis Magnetic Sensor I2C Interface +/- 4Gauss Measurement Range 3x3x1 mm package MMC214x Dual-Axis Magnetic Sensor 3x3x0.7 mm package

MEMSIC Magnetic Sensor Current only applies when taking measurement, thus lower current consumption. (0.01mA/Measurement) Magnetization coil to re-direct magnetization to maintain directionality over time, as well as good zero-point offset. High accuracy due to Wheatstone bridge resistance change. (512DAC/Gauss, 2mGauss Resolution) High sensitivity even across temperature change. The reaction of the magneto resistive effect is very fast (7mS/Measurement) 9/5/2018 MEMSIC Confidential Property

AMR: Anisotropic Magneto Resistive Resistivity changes as a function of the angle between the current generated magnetized field direction and the external magnetic field. Apply current ONLY when you need to measure external magnetic field. 9/5/2018 MEMSIC Confidential Property

Measurement Range of Magnetic Sensor Technology 9/5/2018 MEMSIC Confidential Property