FXOS8700CQ datasheet(55/86 Pages) FREESCALE

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Freescale Semiconductor, Inc.

9.10.9

A_VECM_INITZ_MSB (0x67) register

9.10.10 A_VECM_INITZ_LSB (0x68) register

9.11

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.

9.11.1

TRANSIENT_CFG (0x1D) register

—

a_vecm_initz[13:8]

0b000000

Figure 64. A_VECM_INITZ_MSB register

Table 63. 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.

a_vecm_initz[7:0]

0b00000000

Figure 65. A_VECM_INITZ_LSB register

Table 64. 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.

—

tran_ele

tran_zefe

tran_yefe

tran_xefe

tran_hpf_byp

0000000

Figure 66. TRANSIENT_ CFG register

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