LSM6DS33 Datasheet, PDF(23/77 Page) STMicroelectronics – iNEMO inertial module: always-on 3D accelerometer and 3D gyroscope

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LSM6DS33 Datasheet, PDF (23/77 Pages) STMicroelectronics – iNEMO inertial module: always-on 3D accelerometer and 3D gyroscope

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LSM6DS33

Functionality

5.1

Operating modes

The LSM6DS33 has three operating modes available:

ï· only accelerometer active and gyroscope in power-down

ï· only gyroscope active and accelerometer in power-down

ï· 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 LSM6DS33, 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 â0â, high-performance mode is valid for all ODRs (from 13 Hz up to 1.6 kHz).

To enable the low-power and normal mode, the G_HM_MODE bit has to be set to â1â. Low-

power mode is available for lower ODR (13, 26, 52 Hz) while normal mode is available for

ODRs equal to 104 and 208 Hz.

5.3

Accelerometer power modes

In the LSM6DS33, 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 â0â, high-performance mode is valid for all ODRs (from 13 Hz up to

6.66 kHz).

To enable the low-power and normal mode, the XL_HM_MODE bit has to be set to â1â. Low-

power mode is available for lower ODRs (13, 26, 52 Hz) while normal mode is available for

ODRs equal to 104 and 208 Hz.

5.4

FIFO

The presence of a FIFO allows consistent power saving for the system since the host

processor does not need continuously poll data from the sensor, but it can wake up only

when needed and burst the significant data out from the FIFO.

LSM6DS33 embeds 8 kbytes data FIFO to store the following data:

ï· gyroscope

ï· accelerometer

ï· step counter and time stamp

ï· temperature

DocID027423 Rev 4

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