FXLS8471Q datasheet(58/75 Pages) FREESCALE

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FXLS8471Q

Sensors

Freescale Semiconductor, Inc.

10.9.10 A_VECM_INITZ_LSB (0x68) register

10.10

Transient (AC) acceleration detection

The transient detection function is similar to the freefall/motion detection function with the exception that a high-pass filter can be

used to eliminate the DC offset from the acceleration data. There is an option to disable the high-pass filter, which causes the

transient detection function to work in a similar manner to the motion detection function.

The transient detection function can be configured to signal an interrupt when the high-pass filtered acceleration delta values for

any of the enabled axes exceeds the threshold programmed in TRANSIENT_THS for the debounce time programmed in

TRANSIENT_COUNT. For more information on how to use and configure the transient detection function please refer to

Freescale application note AN4461.

10.10.1 TRANSIENT_CFG (0x1D) register

Table 106. A_VECM_INITZ_MSB bit description

Field

Description

a_vecm_initz[13:8]

Most significant 6 bits of the signed 14-bit initial Z-axis value to be used as ref_z when A_VECM_CFG[a_vecm_initm]

= 1. The resolution is determined by the settings made in XYZ_DATA_CFG[fs], and is equal to the accelerometer

resolution.

Table 107. A_VECM_INITZ_LSB register

a_vecm_initz[7:0]

8’b00000000

Table 108. A_VECM_INITZ_LSB bit description

Field

Description

a_vecm_initz[7:0]

LSB of the signed 14-bit initial Z-axis value to be used as ref_z when A_VECM_CFG[a_vecm_initm] = 1. The

resolution is determined by the settings made in XYZ_DATA_CFG[fs], and is equal to the accelerometer resolution.

Table 109. TRANSIENT_ CFG register

—

tran_ele

tran_zefe

tran_yefe

tran_xefe

tran_hpf_byp

0000000

Table 110. TRANSIENT_ CFG bit descriptions

Field

Description

tran_ele

Transient event flag latch enable. Default value: 0

0: Event flag latch disabled: the transient interrupt flag reflects the real-time status of the function.

1: Event flag latch enabled: the transient interrupt event flag is latched and a read of the TRANSIENT_SRC register is

required to clear the event flag.

tran_zefe

Z-axis transient event flag enable. Default value: 0

0: Z-axis event detection disabled

1: Z-axis event detection enabled. Raise event flag on Z-axis acceleration value greater than threshold.

tran_yefe

Y-axis transient event flag enable. Default value: 0

0: Y-axis event detection disabled

1: Y-axis event detection enabled. Raise event flag on Y-axis acceleration value greater than threshold.

tran_xefe

X-axis transient event flag enable. Default value: 0

0: X-axis event detection disabled

1: X-axis event detection enabled. Raise event flag on X-axis acceleration value greater than threshold.

tran_hpf_byp

Transient function high-pass filter bypass. Default value: 0

0: High-pass filter is applied to accelerometer data input to the transient function.

1: High-pass filter is not applied to accelerometer data input to the transient function.

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