AN2381 datasheet(35/47 Pages) STMICROELECTRONICS

35 / 47 page

AN2381

Registers Description

35/47

5.5.3

DD_ACK (3Ah)

Direction Detection Acknowledge, dummy register. A read at this address allows the refresh

of the DD_SRC register and clears any DD interrupt signal.

5.5.4

DD_THSI_L (3Ch)

Direction Detection Internal Threshold, less significant bits.

5.5.5

DD_THSI_H (3Dh)

Direction Detection Internal Threshold, most significant bits.

The concatenation of DD_THSI_H and DD_THSI_L registers defines the inner/internal

threshold which is used by the LIS3LV02DL device for direction-detection (refer to

Figure 13). The threshold value is expressed over 16 bit as an unsigned number. In

particular 7FFFh corresponds to full-scale acceleration (i.e. either 2g or 6g depending on

the value of FS bit in CTRL_REG2). In case no hysteresis is desired, the inner and outer

thresholds must be equal.

The inner threshold should be lower than or equal to the outer one. Whenever the inner

thresholds is greater than the outer one, the hysteresis region will be null and the threshold

used to detect the tilt direction is DD_THSE_H & DD_THSE_L only.

5.5.6

DD_THSE_L (3Eh)

Direction Detection External Threshold, less significant bits.

5.5.7

DD_THSE_H (3Fh)

Direction Detection External Threshold, most significant bits.

THSI7

THSI6

THSI5

THSI4

THSI3

THSI2

THSI1

THSI0

THSI7, THSI0

Direction detection Internal Threshold Lsb

THSI15

THSI14

THSI13

THSI12

THSI11

THSI10

THSI9

THSI8

THSI15, THSI8

Direction detection Internal Threshold Msb

THSE7

THSE6

THSE5

THSE4

THSE3

THSE2

THSE1

THSE0

THSE7, THSE0

Direction detection External Threshold Lsb

THSE15

THSE14

THSE13

THSE12

THSE11

THSE10

THSE9

THSE8

THSE15, THSE8

Direction detection External Threshold Msb

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