ASM330LHB datasheet(28/131 Pages) STMICROELECTRONICS

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Functionality

6.1

Operating modes

In the ASM330LHB, 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 ASM330LHB has three operating modes available:

•

only accelerometer active and gyroscope in power-down or sleep mode

•

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.

Note:

If the accelerometer is to be activated in high-performance operating mode while the gyroscope is already

running (that is, the gyroscope is not in power-down mode), proceed as follows:

Disable the accelerometer high-performance operating mode (set the XL_HM_MODE bit to 1 in the

CTRL6_C (15h) register).

Write the CTRL1_XL (10h) register to 50h.

Read the OUTZ_H_A (2Dh) register to clear the XLDA bit in the STATUS_REG (1Eh) register.

Wait for 1/ODR_XL time period or wait until the XLDA bit in the STATUS_REG (1Eh) register becomes

equal to 1.

Enable the accelerometer high-performance operating mode (set the XL_HM_MODE bit to 0 in the

CTRL6_C (15h) register).

Write the CTRL1_XL (10h) register to the desired value.

6.2

Gyroscope power modes

In the ASM330LHB, the gyroscope can be configured in two different operating modes: low-power 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 1.67 kHz).

To enable low-power mode, the G_HM_MODE bit has to be set to 1. Low-power mode is available for ODRs

equal to 12.5 Hz, 26 Hz, 52 Hz, 104 Hz and 208 Hz.

6.3

Accelerometer power modes

In the ASM330LHB, the accelerometer can be configured in two different operating modes: low-power 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 1.67 kHz).

To enable low-power mode, the XL_HM_MODE bit has to be set to 1. Low-power mode is available for ODRs

equal to 1.6 Hz, 12.5 Hz, 26 Hz, 52 Hz, 104 Hz and 208 Hz.

ASM330LHB

Functionality

DS13773 - Rev 7

page 28/131

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