LPS22DF datasheet(35/54 Pages) STMICROELECTRONICS

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Table 19. Power consumption

AVG

One-shot mode

Continuous mode – current consumption (μA) vs. ODR

Current consumption (μA) @ 1 Hz

ODR Max 1 Hz

4 Hz

10 Hz 25 Hz 50 Hz 75 Hz 100 Hz 200 Hz

512

32.2

32.8 126.8 314.4

783.8

128

9.4

35.6

86.7

214.3

427

639.8

5.6

100

6.3

20.4

48.7

119.4

237.2

355

472.8

3.7

200

4.4

12.8

29.8

71.9

142.2

212.6

282.9

564.4

2.7

300

3.5

20.2

48.2

94.8

141.4

188

374

400

2.7

12.6

29.1

56.5

84.2

111.5

221.7

1.7

500

2.5

10.2

23.2

44.7

66.2

87.8

174

The noise performance of LPS22DF is also defined as depending on the ODR and selected resolution and its

performance is a trade-off between the power consumption and resolution. The noise performance is indicated in

the following table.

Table 20. Noise performance

AVG

Pressure noise (Parms)

ODR/2(1)

ODR/4

ODR/9

512

0.59

0.44

0.34

128

0.90

0.67

0.48

1.20

0.86

0.64

1.64

1.16

0.87

2.30

1.63

1.18

3.12

2.18

1.60

4.26

2.87

2.20

1. LPF1 filter is disabled.

When the ODR bits are set to '0000', the device is in Power-down mode. When the device is in Power-down

mode, almost all internal blocks of the device are switched off to minimize power consumption. The digital

interface is still active to allow communication with the device. The content of the configuration registers is

preserved and output data registers are not updated, therefore keeping the last data sampled in memory before

going into power-down mode.

If the ONESHOT bit in CTRL_REG2 (11h) is set to '1', One-shot mode is triggered and a new acquisition starts

when it is required. Enabling this mode is possible only if the device was previously in power-down mode (ODR

bits set to '0000'). Once the acquisition is completed and the output registers updated, the device automatically

enters in power-down mode. ONESHOT bit self-clears itself.

When the ODR bits are set to a value different than '0000', the device is in Continuous mode and automatically

acquires a set of data (pressure and temperature) at the frequency selected through the ODR[3:0] bits.

LPS22DF

CTRL_REG1 (10h)

DS13316 - Rev 1

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