LSM6DSTX datasheet(28/175 Pages) STMICROELECTRONICS

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Functionality

6.1

Operating modes

In the LSM6DSTX, 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 LSM6DSTX 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 LSM6DSTX, the accelerometer can be configured in five different operating modes: power-down, ultralow-

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 ultralow-power mode

The LSM6DSTX can be configured in ultralow-power (ULP) mode by setting the XL_ULP_EN bit to 1 in the

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.

6.3

Gyroscope power modes

In the LSM6DSTX, 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.

LSM6DSTX

Functionality

DS14039 - Rev 1

page 28/175

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