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Accelerometer: Mobile Phone Spares
The accelerometer is a MEMS (Micro-Electro-Mechanical Systems) sensor that measures linear acceleration along three axes. The phone uses its output to detect orientation (portrait vs landscape), to count steps in fitness applications, and to trigger features like screen auto-rotation and sleep-on-face-down behaviour.
How MEMS Accelerometers Work
A MEMS accelerometer contains a proof mass — a tiny suspended structure micromachined into silicon — connected to the substrate by flexible beams. When the device accelerates, the proof mass's inertia causes it to lag behind the substrate movement, deflecting the beams. Capacitive plates on either side of the proof mass detect this deflection as a change in capacitance, which is converted to an acceleration value by onboard signal processing.
The sensor outputs three channels: acceleration in X, Y, and Z axes simultaneously, at a selectable sample rate from a few Hz to several kHz.
Integration in Smartphones
In modern smartphones, the accelerometer is typically integrated into a combined IMU (Inertial Measurement Unit) package that also contains the gyroscope and sometimes the magnetometer. This multi-sensor approach reduces component count and simplifies the board layout. The IMU package communicates with the application processor via I2C or SPI interface.
Failure and Repair
Accelerometer failure is rarely an isolated hardware event. More commonly, auto-rotation failure is a software issue (rotation lock enabled) or a display assembly alignment issue (the rotation state is determined correctly but the display is not responding). A confirmed hardware IMU failure points to the motherboard — chip-level repair or board replacement applies.
