Operating modes

AN2989

12/28

Doc ID 15761 Rev 1

3

Operating modes

The LIS331DLH can operate in the following four modes, which can be selected through the

configuration of CTR_REG1 and CTRL_REG5:

–

Normal mode

–

Power-down

–

Low-power

–

Sleep to wake

With reference to the datasheet of the device, the power-mode (PM) and data rate (DR) bits

of CTRL_REG1 are used to select the basic operating modes (power-down, normal mode

and low-power), while the TurnOn bits of CTRL_REG5 are used to enable the advanced

mode (sleep to wake) which also involves the interrupt configuration.

Note:

The PMx bits are disabled if the Turnonx bits of CTRL_REG5 are not configured as zeros.

Table 6.

Power mode and low-power output data rate configurations

PM2

PM1

PM0

Power mode selection

Output data rate [Hz]

000

Power-down

--

0

0

1

Normal mode

ODR

010

Low-power

0.5

011

Low-power

1

100

Low-power

2

101

Low-power

5

110

Low-power

10

Table 7.

CTRL_REG1 - data rate

DR!

DR0

Data rate generation [Hz]

ODR

00

50

01

100

10

400

Table 8.

CTRL_REG5 - sleep to wake configuration

TurnOn1

TurnOn0

Sleep to wake status

0

0

Sleep to wake function disabled

0

1

An interrupt event is occurred and system is generating data at ODR

1

0

Not allowed

1

1

Sleep to wake function enabled