Operating modes

AN2847

14/31

Doc ID 15136 Rev 2

Table 9 and Table 10 show the typical power consumption values for the different operating

modes.

Note:

Higher data rates correspond to lower device resolution.

3.1

Normal mode

In Normal mode, data are generated at the data rate (ODR) selected through the DR bits

and for the axis enabled through the Zen, Yen and Xen bits of the CTRL_REG1 register.

Data generated for a disabled axis is 00h.

Data interrupt generation is active and configured through the INT1_CFG and INT2_CFG

registers.

3.2

Power down mode

When the device is in Power Down mode, almost all internal blocks of the device are

to allow communication with the device. The content of the configuration register is

preserved and output data registers are not updated, thus keeping in memory the last data

sampled before going to Power Down mode.

Typical turn-on time to return to Normal mode is 1 ms + 1/ODR.

Table 8.

CTRL_REG5 - sleep to wake configuration

TurnOn1

TurnOn0

Sleep to wake status

0

0

Sleep to wake function disabled

01

An interrupt event has occurred and the system is generating data at

ODR

1

0

Not allowed

1

1

Sleep to wake function enabled

Table 9.

ODR

50 Hz

100 Hz

400 Hz

1000 Hz

Power consumption

250

255

290

370

Table 10.

Power consumption - low power mode (µA)

0.5 Hz

1 Hz

2 Hz

5 Hz

10 Hz

50 Hz

10

20

30

60

99

100 Hz

10

15

20

40

80

400 Hz

10

15

20

40

80

1000 Hz

5

10

15

30

60