Freescale Semiconductor FRDM-FXS-MULTI 데이터 시트

Sensors

84

Freescale Semiconductor, Inc.

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

W

hen 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).

m_ost

One-shot triggered 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 

).

m_hms[1:0]

0b00 = Only accelerometer sensor is active
0b01 = Only magnetometer sensor is active
0b11 = 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]

0

0

0

0

0

0

0b00

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 using the 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 sensor reset (degaussing) frequency:
0b00: Automatic magnetic reset at the beginning of each ODR cycle (default).
0b01: Automatic magnetic reset every 16 ODR cycles.
0b10: Automatic magnetic reset every 512 ODR cycles.
0b11: 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 196. M_CTRL_REG1 bit descriptions (Continued)