LSM6DSM Datasheet, PDF (29/113 Pages) STMicroelectronics – always-on 3D accelerometer and 3D gyroscope

LSM6DSM
5
Functionality
Functionality
5.1
Operating modes
In the LSM6DSM, the accelerometer and the gyroscope can be turned on/off independently
of each other and are allowed to have different ODRs and power modes.
The LSM6DSM has three operating modes available:
 only accelerometer active and gyroscope in power-down
 only gyroscope active and accelerometer in power-down
 both accelerometer and gyroscope sensors active with independent ODR
The accelerometer is activated from power-down by writing ODR_XL[3:0] in CTRL1_XL
(10h) while the gyroscope is activated from power-down by writing ODR_G[3:0] in
CTRL2_G (11h). For combo-mode the ODRs are totally independent.
5.2
Gyroscope power modes
In the LSM6DSM, the gyroscope can be configured in four different operating modes:
power-down, low-power, normal mode and high-performance mode. The operating mode
selected depends on the value of the G_HM_MODE bit in CTRL7_G (16h). If G_HM_MODE
is set to '0', high-performance mode is valid for all ODRs (from 12.5 Hz up to 6.66 kHz).
To enable the low-power and normal mode, the G_HM_MODE bit has to be set to '1'. Low-
power mode is available for lower ODRs (12.5, 26, 52 Hz) while normal mode is available
for ODRs equal to 104 and 208 Hz.
5.3
Accelerometer power modes
In the LSM6DSM, the accelerometer can be configured in four different operating modes:
power-down, low-power, normal mode and high-performance mode. The operating mode
selected depends on the value of the XL_HM_MODE bit in CTRL6_C (15h). If
XL_HM_MODE is set to '0', high-performance mode is valid for all ODRs (from 12.5 Hz up
to 6.66 kHz).
To enable the low-power and normal mode, the XL_HM_MODE bit has to be set to '1'. Low-
power mode is available for lower ODRs (1.6, 12.5, 26, 52 Hz) while normal mode is
available for ODRs equal to 104 and 208 Hz.
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