LIS331DLF datasheet(29/38 Pages) STMICROELECTRONICS

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LIS331DLF

Doc ID 15101 Rev 4

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7.6

CTRL_REG5 (24h)

TurnOn bits are used for turning on the sleep to wake function.

7.7

HP_FILTER_RESET (25h)

Dummy register. Reading at this address zeroes instantaneously the content of the internal

high pass-filter. If the high pass filter is enabled all three axes are instantaneously set to 0g.

This allows to overcome the settling time of the high pass filter.

7.8

REFERENCE (26h)

This register sets the acceleration value taken as a reference for the high-pass filter output.

When filter is turned on (at least one of FDS, HPen2, or HPen1 bit is equal to ‘1’) and HPM

bits are set to “01”, filter out is generated taking this value as a reference.

Table 29.

CTRL_REG4 description

FS1, FS0

Full-scale selection. Default value: 00.

(00: ±2

g; 01: ±4 g; 11: ±8 g)

STsign

Self-test sign. Default value: 00.

(0: self-test plus; 1 self-test minus)

Self-test enable. Default value: 0.

(0: self-test disabled; 1: self-test enabled)

SIM

SPI serial interface mode selection. Default value: 0.

(0: 4-wire interface; 1: 3-wire interface)

Table 30.

CTRL_REG5 register

000

TurnOn1

TurnOn0

Table 31.

CTRL_REG5 description

TurnOn1,

TurnOn0

Turn-on mode selection for sleep to wake function. Default value: 00.

Table 32.

REFERENCE register

Ref7

Ref6

Ref5

Ref4

Ref3

Ref2

Ref1

Ref0

Table 33.

REFERENCE description

Ref7 - Ref0

Reference value for high-pass filter. Default value: 00h.

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