FXOS8700CQ datasheet(58/86 Pages) FREESCALE

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An ODR of 100 Hz and a TRANSIENT_COUNT value of 15 would result in minimum debounce response time of 150 ms. When

the device is operated in hybrid mode, these settings would result in an effective debounce time of 300 ms.

9.12

Pulse detection

9.12.1

PULSE_CFG (0x21) register

This register configures the pulse event detection function.

Table 69. TRANSIENT_COUNT relationship with the ODR

ODR (Hz)

Max time range (s)

Time step (ms)

Normal

LPLN

High

resolution

Low power

Normal

LPLN

High

resolution

Low power

800

0.319

1.25

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

pls_dpa

pls_ele

pls_zdpefe

pls_zspefe

pls_ydpefe

pls_yspefe

pls_xdpefe

pls_xspefe

00000000

Figure 70. PULSE_CFG register

Table 70. PULSE_CFG bit descriptions

Field

Description

pls_dpa

Double pulse abort.

0: Double pulse detection is not aborted if the start of a pulse is detected during the time period specified by the

PULSE_LTCY register.

1: Setting the pls_dpa bit momentarily suspends the double tap detection if the start of a pulse is detected during the

time period specified by the PULSE_LTCY register and the pulse ends before the end of the time period specified by

the PULSE_LTCY register.

pls_ele

Pulse event flag latch enable. When enabled, a read of the PULSE_SRC register is needed to clear the event flag.

0: Event flag latch disabled

1: Event flag latch enabled

pls_zdpefe

Event flag enable on double pulse event on Z-axis.

0: Event detection disabled

1: Raise event flag on detection of double pulse event on Z-axis

pls_zspefe

Event flag enable on single pulse event on Z-axis.

0: Event detection disabled

1: Raise event flag on detection of single pulse event on Z-axis

pls_ydpefe

Event flag enable on double pulse event on Y-axis.

0: Event detection disabled

1: Raise event flag on detection of double pulse event on Y-axis

pls_yspefe

Event flag enable on single pulse event on Y-axis.

0: Event detection disabled

1: Raise event flag on detection of single pulse event on Z-axis.

pls_xdpefe

Event flag enable on double pulse event on X-axis.

0: Event detection disabled

1: Raise event flag on detection of double pulse event on X-axis.

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