FXOS8700CQ datasheet(49/86 Pages) FREESCALE

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Table 51. A_FFMT_THS_X_MSB (0x73) bit descriptions

Field

Description

a_ffmt_ths_xyz_en

For a_ffmt_ths_xyz_en = 0 the ASIC uses the ffmt_ths[6:0] value located in register x17[6:0] as a common threshold

for the X, Y, and Z-axis acceleration detection. The common unsigned 7-bit acceleration threshold has a fixed

resolution of 63 mg/LSB, with a range of 0-127 counts.

For a_ffmt_ths_xyz_en = 1 the ASIC ignores the common 7-bit G_FFMT_THS value located in register x17 when

executing the FFMT function, and the following independent threshold values are used for each axis:

A_FFMT_THS_X_MSB and A_FFMT_THS_X_LSB are used for the X-axis acceleration threshold,

A_FFMT_THS_Y_MSB and A_FFMT_THS_Y_LSB for the Y-axis acceleration threshold,

A_FFMT_THS_Z_MSB and A_FFMT_THS_Z_LSB for the Z-axis acceleration threshold.

The A_FFMT_THS_X/Y/Z thresholds are 13-bit unsigned values that have the same resolution as the accelerometer

output data determined by XYZ_DATA_CFG fs [1:0]. The a_ffmt_ths_xyz_en and a_ffmt_trans_ths_en bits must not

be enabled simultaneously.

a_ffmt_ths_x[12:6]

7-bit MSB of X-axis acceleration threshold

a_ffmt_ths_x[5:0]

—

0b000000

Figure 48. A_FFMT_THS_X_LSB (0x74) register

a_ffmt_trans_ths_en

a_ffmt_ths_y[12:6]

0b0000000

Figure 49. A_FFMT_THS_Y_MSB (0x75) register

Table 52. A_FFMT_THS_X_MSB (0x73) bit descriptions

Field

Description

a_ffmt_trans_ths_en

For a_ffmt_trans_ths_en =0 the ASIC uses the tr_ths[6:0] value located in TRANSIENT_THS (0x1F) register as a

common threshold for the X, Y, and Z-axis transient acceleration detection. The common unsigned 7-bit transient

acceleration threshold has a fixed resolution of 63 mg/LSB with a range of 0-127 counts.

For a_ffmt_trans_ths_en = 1 the ASIC ignores the common 7-bit tr_ths[6:0] value located in register x1F when

executing the transient acceleration function, and the following independent threshold values are used for each axis:

A_FFMT_THS_X_MSB and A_FFMT_THS_X_LSB are used for the X-axis transient acceleration threshold,

A_FFMT_THS_Y_MSB and A_FFMT_THS_Y_LSB for the Y-axis transient acceleration threshold,

A_FFMT_THS_Z_MSB and A_FFMT_THS_Z_LSB for the Z-axis transient acceleration threshold.

The A_FFMT_THS_X/Y/Z thresholds are 13-bit unsigned values that have the same resolution as the accelerometer

output data determined by XYZ_DATA_CFG fs [1:0]. The a_ffmt_ths_xyz_en and a_ffmt_trans_ths_en bits must not

be enabled simultaneously

a_ffmt_ths_y[12:6]

7-bit MSB of Y-axis acceleration threshold

a_ffmt_ths_y[5:0]

—

0b000000

Figure 50. A_FFMT_THS_Y_LSB (0x76) register

—

a_ffmt_ths_z[12:6]

0b0000000

Figure 51. A_FFMT_THS_Z_MSB (0x77) register

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