FXOS8700CQ datasheet(67/86 Pages) FREESCALE

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Sensors

Freescale Semiconductor, Inc.

9.14.5

MIN_X_MSB (0x4B), MIN_X_LSB (0x4C), MIN_Y_MSB (0x4D), MIN_Y_LSB (0x4E),

MIN_Z_MSB (0x4F), MIN_Z_LSB (0x50) registers

The magnetometer MIN_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 MAX_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 MIN_X/Y/Z registers are loaded with the hex value 0x7FFF

(positive full scale). The host application may write to the MIN_X/Y/Z registers to change the currently used minimum values for

each axis, however, when M_CTRL_REG1[maxmin_dis] = 0 (default), the system will overwrite these values when it updates the

MIN_X/Y/Z registers at the end of the next measurement cycle (ODR period).

max_z[15:8]

0b00000000

Figure 98. MAX_Z_MSB register

max_z[7:0]

0b00000000

Figure 99. MAX_Z_LSB register

min_x[15:8]

0b00000000

Figure 100. MIN_X_MSB register

min_x[7:0]

0b00000000

Figure 101. MIN_X_LSB register

min_y[15:8]

0b00000000

Figure 102. MIN_Y_MSB register

min_y[7:0]

0b00000000

Figure 103. MIN_Y_LSB register

min_z[15:8]

0b00000000

Figure 104. MIN_Z_MSB register

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