SensorsのトピックFXLS8964 - Config

FXLS8964 - Config

MaTa — Tue, 13 Jan 2026 01:33:09 GMT

Is there a configuration for this sensor family where the sensor can generate an interrupt for both ~2g transient acceleration and ~3 degree tilt angle change? Would like to set up a HPF and LPF respectively on the sensor, so there is minimum processing on the host side.

Re: FXLS8964 - Config

JozefKozon — Tue, 13 Jan 2026 06:45:09 GMT

Dear Matt,

yes, FXLS8964AF supports a configuration where:

Transient detection (~2 g) uses SDCD in relative mode (HPF-like behavior).
Tilt detection (~3°) uses the orientation engine (LPF-based). Both can assert hardware interrupts, minimizing host-side computation.

Please try following settings.

With Best Regards,

Jozef

Re: FXLS8964 - Config

MaTa — Tue, 13 Jan 2026 18:07:18 GMT

Thanks for the reply Jozef, the orientation engine depends on the z-lock condition correct? The ~3 degree tilt detection would be the angle between gravity vector and the Z-axes.

Re: FXLS8964 - Config

JozefKozon — Wed, 14 Jan 2026 05:12:54 GMT

Dear Matt,

yes, your understanding is correct.

Orientation Engine and Z-Lock
The FXLS8964AF orientation engine uses the z-lock condition to determine whether the device is in a stable orientation relative to gravity. Z-lock essentially checks if the Z-axis is aligned closely enough with the gravity vector (within a configurable threshold). When z-lock is active, the orientation engine can reliably classify the device as "face-up" or "face-down."
Tilt Detection (~3°)
The tilt angle is indeed calculated as the angle between the gravity vector (derived from accelerometer readings) and the Z-axis of the sensor. A 3° tilt means the Z-axis deviates by about 3° from the gravity vector, which is typically used to detect slight movements or confirm orientation stability.

With Best Regards,

Jozef