IIS2DLPCTR datasheet(20/69 Pages) STMICROELECTRONICS

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Terminology and functionality

IIS2DLPC

20/69

DocID031788 Rev 4

3.2

Functionality

3.2.1

Operating modes

Two sets of operating modes have been designed to offer the customer a broad choice of

noise/power consumption combinations:



Low-noise disabled (see Table 11)



Low-noise enabled (see Table 12)

Writing the LOW_NOISE bit in CTRL6 (25h) selects the operating mode (low-noise).

From each of these two sets, five operating modes have been designed:



1 High-Performance Mode: focus on low noise



4 Low-Power Modes: trade-off between noise and power consumption

These operating modes are selected by writing the MODE[1:0] and LP_MODE[1:0] bits in

CTRL1 (20h).

Table 11. Operating modes - low-noise setting disabled

Parameter

High

Performance

Mode

Low-Power

Mode 4

Low-Power

Mode 3

Low-Power

Mode 2

Low-Power

Mode 1

Resolution [bit]

14-bit

12-bit

ODR [Hz]

12.5 - 1600

1.6 - 200

BW [Hz]

ODR/2 (N/A

for 1600 Hz),

ODR/4,

ODR/10,

ODR/20

180

ODR/4,

ODR/10,

ODR/20

360

ODR/4,

ODR/10,

ODR/20

720

ODR/4,

ODR/10,

ODR/20

3200

ODR/4,

ODR/10,

ODR/20

Typ. noise density [μg/√Hz](1)

@ FS = ±2 g, ODR=200 Hz

110

Typ. RMS noise [mg(RMS)](1)

@ FS = ±2 g

1.6

2.1

5.5

Typ. current

consumption [μA]

@ Vdd=1.8 V(1)

ODR=1.6 Hz

0.65

0.55

0.45

0.38

ODR=12.5 Hz

2.5

1.6

ODR=25 Hz

8.5

4.5

1.5

ODR=50 Hz

5.5

ODR=100 Hz

17.5

10.5

ODR=200 Hz

34.5

20.5

ODR=400,800,

1600 Hz

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