AN4506 datasheet(24/47 Pages) STMICROELECTRONICS

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Interrupt generation

AN4506

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DocID026442 Rev 2

5.3

Threshold

Threshold registers IG_THS_xH and IG_THS_xL (respectively MSB and LSB) define the

reference angular rates used by interrupt generation circuitry.

The value of 1 LSB of the threshold depends on the selected full scale (Table 23).

5.4

Duration

The content of the Dx bits in the IG_DURATION register sets the minimum duration of the

interrupt event to be recognized.

Duration steps and maximum values depend on the ODR chosen.

Duration time is measured in N/ODR, where N is the content of the duration register and

ODR is 12.5, 25, 50, 100, 200, 400, and 800.

Table 21. IG_THS_xH register

THSx14

THSx13

THSx12

THSx11

THSx10

THSx9

THSx8

Table 22. IG_THS_xL register

THSx7

THSx6

THSx5

THSx4

THSx3

THSx2

THSx1

THSx0

Table 23. Threshold LSB value

Full scale (dps)

Threshold LSB value (mdps)

245

~7.5

500

~15.3

2000

~61

Table 24. IG_DURATION register

WAIT

Table 25. IG_DURATION description

WAIT

WAIT enable. Default value: 0 (0: disable; 1: enable)

D6 - D0

Duration value. Default value: 000 0000

Table 26. Duration LSB value in Normal mode

ODR (Hz)

Duration LSB value (ms)

12.5

100

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