FXOS8700CQ datasheet(66/86 Pages) FREESCALE

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Sensors

Freescale Semiconductor, Inc.

9.14.4

MAX_X_MSB (0x45), MAX_X_LSB (0x46), MAX_Y_MSB (0x47), MAX_Y_LSB (0x48),

MAX_Z_MSB (0x49), MAX_Z_LSB (0x4A) registers

The magnetometer MAX_X/Y/Z registers are 16-bit 2's complement format with a resolution of 0.1

μT/LSB. The registers are

read/write and along with the MIN_X/Y/Z registers are used to calculate the magnetic offset for each axis using the equation

(MAX_X/Y/Z + MIN_X/Y/Z) /2 when M_CTRL_REG2[maxmin_dis] = 0 (default).

When M_CTRL_REG1[m_acal] = 1 (default 0), the MAG_OFF_X/Y/Z registers are automatically updated with the calculated

offset values at the end of every measurement cycle (ODR period).

On a POR, or after setting M_CTRL_REG2[maxmin_rst] = 1, the MAX_X/Y/Z registers are loaded with the hex value 0x8000

(negative full scale).

The host application may write to the MAX_X/Y/Z registers to change the currently used maximum values for each axis, however,

when M_CTRL_REG1[maxmin_dis] = 0 (default), the system will overwrite these values when it updates the MAX_X/Y/Z

registers at the end of the next measurement cycle (ODR period).

—

cmp_y[13:8]

Figure 90. CMP_Y_MSB (0x3B) register

cmp_y[7:0]

Figure 91. CMP_Y_LSB (0x3C) register

—

cmp_z[13:8]

Figure 92. CMP_Z_MSB (0x3D) register

cmp_z[7:0]

Figure 93. CMP_Z_LSB (0x3E) register

max_x[15:8]

0b00000000

Figure 94. MAX_X_MSB register

max_x[7:0]

0b00000000

Figure 95. MAX_X_LSB register

max_y[15:8]

0b00000000

Figure 96. MAX_Y_MSB register

max_y[7:0]

0b00000000

Figure 97. MAX_Y_LSB register

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