FXOS8700CQ datasheet(74/86 Pages) FREESCALE

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Sensors

Freescale Semiconductor, Inc.

The m_os[2:0] OSR setting along with the system ODR value set in CTRL_REG1 sets the magnetic output data update rate.

When m_hms[1:0] = 2'b11, magnetic output data is available in registers M_OUT_X_MSB (0x33), M_OUT_X_LSB (0x34),

M_OUT_Y_MSB (0x35), M_OUT_Y_LSB (0x36), M_OUT_Z_MSB (0x37), and M_OUT_Z_LSB (0x38) along with the time

synchronized accelerometer data in CMP_X_MSB (0x39), CMP_X_LSB (0x3A), CMP_Y_MSB (0x3B), CMP_Y_LSB (0x3C),

CMP_Z_MSB (0x3D), and CMP_Z_LSB (0x3E).

9.17.2

M_CTRL_REG2 (0x5C) register

m_ost

One-shot magnetic measurement mode:

0: No action taken, or one-shot measurement complete.

1: If device is in Active mode no action is taken. If device is in Standby mode, take one set of magnetic

measurements, clear this bit, and return to Standby mode.

m_os[2:0]

Oversample ratio (OSR) for magnetometer data (see Table 95).

m_hms[1:0]

00 = Only accelerometer sensor is active

01 = Only magnetometer sensor is active

11 = Hybrid mode, both accelerometer and magnetometer sensors are active(1)

1. When operating in hybrid mode, the effective ODR for each sensor is half of the frequency selected in the CTRL_REG1[dr] and

CTRL_REG1[aslp_rate] bit fields.

—

hyb_autoinc_mode

m_maxmin_dis m_maxmin_dis_ths

m_maxmin_rst

m_rst_cnt[1:0]

0b00

Figure 124. M_CTRL_REG2 register

Table 94. M_CTRL_REG2 bit descriptions

Field

Description

hyb_autoinc_mode

With hyb_autoinc_mode = 1 and fast-read mode is disabled (CTRL_REG1 [f_read] = 0), the register address will

automatically advance to register x33 (M_OUT_X_MSB) after reading register x06 (OUT_Z_LSB) in burst-read

mode. For hyb_autoinc_mode = 1 and fast read mode enabled (CTRL_REG1[f_read = 1) the register address will

automatically advance to register x33 (M_OUT_X_MSB) after reading register x05 (OUT_Z_MSB) during a burst-

read mode. Please refer to the register map auto-increment address column for further information.

m_maxmin_dis

Magnetic measurement max/min detection function disable:

0: Magnetic min/max detection function is enabled (default).

1: Magnetic min/max detection function is disabled.

When enabled, the magnetic min/max detection function will update the MAX_X/Y/Z and MIN_X/Y/Z

registers at the end of each ODR cycle with the maximum and minimum magnetic measurements from each axis.

This is used along with the auto-cal feature (M_CTRL_REG1[m_acal] = 1) as a hardware based hard-iron offset

compensation function.

m_maxmin_dis_ths

Magnetic measurement min/max detection function disable via magnetic threshold event trigger:

0: No impact to magnetic min/max detection function on a magnetic threshold event

1: Magnetic min/max detection function is disabled when magnetic threshold event is triggered

m_maxmin_rst

Magnetic measurement min/max detection function reset:

0: No reset sequence is active

1: Setting this bit resets the MIN_X/Y/Z and MAX_X/Y/Z registers to 0x7FFF and 0x8000, respectively (positive and

negative full-scale values).This bit is automatically cleared after the reset is completed.

m_rst_cnt[1:0]

Magnetic auto-reset de-gauss frequency:

00: Automatic magnetic reset at the beginning of each ODR cycle (default).

01: Automatic magnetic reset every 16 ODR cycles.

10: Automatic magnetic reset every 512 ODR cycles.

11: Automatic magnetic reset is disabled. Magnetic reset only occurs automatically on a transition from Standby to

Active mode, or can be triggered manually by setting M_CTRL_REG1 [m_rst] = 1

Table 93. M_CTRL_REG1 bit descriptions

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