Using the device step-by-step, from basic to advanced

AN4159

12/27

Doc ID 023639 Rev 3

100 °C = 0x6BD0, 0 °C = 0xB050

5.1.2

Power optimization and estimation

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Pavg = bit [3..0] of I2C register @0x10 (LPS331AP_RES_ADDR)

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Tavg = bit [6..4] of I2C register @0x10 (LPS331AP_RES_ADDR)

Stand-by: The minimum power consumption is when the device is in PD=0 AND the

interrupt pins are not configured to drain current.

Operating: The power consumption depends on HW averaging and AutoRefresh frequency.

In one shot mode, the device automatically goes stand by when measurement is completed.

The right compromise between consumption, update speed and software filtering has to be

tuned application by application.

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Icc = [1 µA/Hz + 48 nA/Hz*Pavg] * ODRP + 32 nA/Hz * Tavg * ODRT

ODRP= ODR Pressure (Hz)

ODRT= ODR Temperature (Hz)

Pavg=nPAve= Pressure Average (1,2,4…512)

Tavg=nTAve= Temperature Average (1,2,4..128)

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Examples 1:

ODRT=ODR Temperature=25 Hz

ODRP=ODR Pressure=25 Hz

Pavg=Pressure average=512

Tavg=Temperature Average=64

Icc=690 µA (Vdd independent at first approximation)

Table 2.

Resolution mode

T_RES=bit[6..4]@0x10

Tavg

P_RES=bit[3:0]@0x10

Pavg

01

01

12

12

24

24

38

38

416

4

16

532

5

32

664

6

64

71287128

8

256

9

384

A

512