AN3308 datasheet(9/52 Pages) STMICROELECTRONICS

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AN3308

Operating modes

Doc ID 18198 Rev 1

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Operating modes

The LIS3DH provides three different operating modes, respectively reported as power-down

mode, normal mode, and low power mode. While normal mode guarantees higher

resolution, low power mode further reduces the current consumption.

After power supply is applied, the LIS3DH performs a 5 ms boot procedure to load the

trimming parameter. After the boot is completed, the device is automatically configured in

power-down mode.

Referring to the LIS3DH datasheet, output data rate (ODR) and low power enable (LPen)

bits of CTRL_REG1 and HR bits of CTRL_REG4 are used to select the operating modes

(power-down mode, normal mode and low power mode) and output data rate (Table 2 and

Table 3).

Table 4 shows the typical values of the power consumption for the different operating

modes.

Table 2.

Operating mode selection

Operating mode

CTRL_REG1[3]

(LPen bit)

CTRL_REG4[3]

(HR bit)

BW [Hz]

Turn-on time

[ms]

Low power mode

ODR/2

Normal mode

ODR/9

7/ODR

Table 3.

Data rate configuration

ODR3

ODR2

ODR1

ODR0

Power mode selection

0000

Power-down mode

0001

Normal/low power mode (1 Hz)

0010

Normal/low power mode (10 Hz)

0011

Normal/low power mode (25 Hz)

0100

Normal/low power mode (50 Hz)

0101

Normal/low power mode (100 Hz)

0110

Normal/low power mode (200 Hz)

0111

Normal/low power mode (400 Hz)

1000

Low power mode (1.5 kHz)

1001

Normal (1.250 kHz)/low power mode (5 kHz)

Table 4.

Power consumption (

μA)

ODR(Hz)

Normal mode (

μA)

Low power mode (

μA)

Power-down

0.4

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