FXOS8700CQ datasheet(51/86 Pages) FREESCALE

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Freescale Semiconductor, Inc.

For example, an ODR of 100 Hz and a A_ FFMT_COUNT value of 15 would result in minimum debounce response time of

150 ms. If the device is operated in hybrid mode, the effective debounce response time will be 300 ms for the same settings.

Figure 55. Behavior of the A_FFMT debounce counter in relation to the a_ffmt_dbcntm setting

Table 54. A_FFMT_COUNT relationship with the ODR

High-Pass cutoff frequency (Hz)

ODR (Hz)

Max time range (s)

Time step (ms)

Normal

LPLN

High

resolution

Low power

Normal

LPLN

High

resolution

400

0.638

2.5

200

1.28

0.638

1.28

2.5

100

2.55

0.638

2.55

2.5

5.1

0.638

5.1

2.5

12.5

5.1

20.4

0.638

20.4

2.5

6.25

5.1

40.8

0.638

40.8

160

2.5

160

1.56

5.1

163

0.638

163

640

2.5

640

Low-g Event on

Count Threshold

all 3-axis

FF Counter

Low-g Event on

Count Threshold

(a)

all 3-axis

Debounce Counter

Low-g Event on

Count Threshold

all 3-axis

a_ffmt_dbcntm = 1

(b)

a_ffmt_dbcntm = 1

(c)

Debounce Counter

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