LSM6DST datasheet(47/180 Pages) STMICROELECTRONICS

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LSM6DST

Functionality

180

Functionality

6.1

Operating modes

In the LSM6DST, 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 LSM6DST 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.

6.2

Accelerometer power modes

In the LSM6DST, the accelerometer can be configured in five different operating modes:

power-down, ultra-low-power, 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.

6.2.1

Accelerometer ultra-low-power mode

The LSM6DST can be configured in ultra-low-power (ULP) mode by setting the

XL_ULP_EN bit to 1 in CTRL5_C (14h) register. This mode can be used in accelerometer-

only mode (gyroscope sensor must be configured in power-down mode) and for ODR_XL

values between 1.6 Hz and 208 Hz.

When ULP mode is intended to be used, the bit XL_HM_MODE must be set to 0.

When ULP mode is switched ON/OFF, the accelerometer must be configured in power-

down condition.

ULP mode cannot be used in Mode 3 or Mode 4 connection modes.

The embedded functions based on accelerometer data (free-fall, 6D/4D, tap, double-tap,

wake-up, activity/inactivity, stationary/motion, step-counter, step-detection, significant

motion, tilt) and the FIFO batching functionality are still supported when ULP mode is

enabled.

LSM6DST 数据表(PDF) 47 Page - STMicroelectronics

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