LSM6DSL Datasheet, PDF (16/113 Pages) STMicroelectronics – iNEMO inertial module: always-on 3D accelerometer and 3D gyroscope

Embedded low-power features
2
Embedded low-power features
LSM6DSL
The LSM6DSL has been designed to be fully compliant with Android, featuring the following
on-chip functions:
 4 kbyte data buffering
– 100% efficiency with flexible configurations and partitioning
– Possibility to store timestamp
 Event-detection interrupts (fully configurable):
– Free-fall
– Wakeup
– 6D orientation
– Click and double-click sensing
– Activity / inactivity recognition
 Specific IP blocks with negligible power consumption and high-performance:
– Pedometer functions: step detector and step counters
– Tilt (refer to Section 2.1: Tilt detection for additional information
– Absolute Wrist Tilt (refer to Section 2.2: Absolute wrist tilt for additional
information)
– Significant Motion Detection
 Sensor hub
– Up to 6 total sensors: 2 internal (accelerometer and gyroscope) and 4 external
sensors
 Data rate synchronization with external trigger for reduced sensor access and enhanced
fusion
2.1
Tilt detection
The tilt function helps to detect activity change and has been implemented in hardware
using only the accelerometer to achieve both the targets of ultra-low power consumption
and robustness during the short duration of dynamic accelerations.
It is based on a trigger of an event each time the device's tilt changes. For a more
customized user experience, in the LSM6DSL the tilt function is configurable through:
 a programmable average window
 a programmable average threshold
The tilt function can be used with different scenarios, for example:
a) Triggers when phone is in a front pants pocket and the user goes from sitting to
standing or standing to sitting;
b) Doesn’t trigger when phone is in a front pants pocket and the user is walking,
running or going upstairs.
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