AN2847

Operating modes

Doc ID 15136 Rev 2

13/31

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 PowerMode (PM) and DataRate (DR) bits

of CTRL_REG1 register are used to select the basic operating modes (Power Down, Normal

mode and Low Power). The TurnOn bits of the CTRL_REG5 register are used to enable

Sleep to Wake, which is an advanced mode involving the interrupt configuration also.

Note:

The PMx bits are disabled if the TurnOnx bits of the 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]

00

0

Power Down

--

0

0

1

Normal mode

ODR

0

1

0

Low Power

0.5

01

1

Low Power

1

10

0

Low Power

2

10

1

Low Power

5

11

0

Low Power

10

Table 7.

CTRL_REG1 - data rate

DR!

DR0

Data rate generation [Hz]

ODR

00

50

01

100

10

400

1

1

1000