ICM-426xx APEX Motion Functions: Description and Usage
■APEX (Advanced Pedometer and Event Detection – NeXt Generation) Motion is a digital block inside the ICM-426xx family of Inertial Measurement Units. APEX processes accelerometer data, extracts measurements, and asserts motion-specific interrupts. APEX features use accelerometer data, not gyroscope data.
■Each APEX feature has its own set of configuration bits and the features can run concurrently. Most APEX features assert an interrupt after a motion event (Significant Motion Detection asserts an interrupt but does not provide any measurements), while other features will extract data and provide to the user (Pedometer counts steps and can also assert interrupts).
■The Pedometer counts user steps, measures cadence, classifies if a user is walking or running, and issues an interrupt on a new step or step counter overflow. Tilt Detection issues an interrupt when it detects a >35° change in the direction of gravity. Raise-To-Wake/Sleep (R2W) issues an interrupt when the sensor is oriented to a face-up position (designed to identify the “raise” gesture of a user raising a mobile phone into view). Tap detection issues an interrupt when 1 or 2 pulses are observed on the accelerometer. Wake-On-Motion (WoM) issues an interrupt when the accelerometer change is greater than a programmable threshold, designed to alert the user upon transition from a stationary state to a moving state. Significant Motion Detection (SMD) asserts an interrupt when two sequential WoM events occur within a 1s or 3s window.
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ICM-426xx 、 ICM-426xx family 、 ICM-42688-P 、 ICM-42605 、 ICM-42688-V |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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08/18/2021 |
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Revision: 1.1 |
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AN-000173 |
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1.7 MB |
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