FXOS8700CQ datasheet(38/86 Pages) FREESCALE

38 / 86 page

Sensors

Freescale Semiconductor, Inc.

If any of the interrupt sources listed under the “Wake-from-Sleep” column is asserted, then the system will transition out of the

low sample rate Auto-Sleep mode to the user specified fast sample rate provided the user specified wake event function is

enabled in register CTRL_REG3.

If the Auto-Sleep interrupt is enabled, a transition from Active mode to Sleep mode and vice-versa will generate an interrupt.

If CTRL_REG3[fifo_gate] = 1, transitioning to Auto-Sleep mode will preserve the FIFO contents, set SYSMOD[fgerr] (FIFO Gate

error), and stop new acquisitions. The system will wait for the FIFO buffer to be emptied by the host application before new

samples can be acquired.

Figure 25. Auto-Sleep state transition diagram

9.3

Temperature

9.3.1

TEMP (0x51) register

8-bit 2’s compliment sensor temperature value with 0.96°C/LSB resolution. Temperature data is only valid between -40°C and

125°C.

9.4

Accelerometer output data registers

9.4.1

OUT_X_MSB (0x01), OUT_X_LSB (0x02), OUT_Y_MSB (0x03), OUT_Y_LSB (0x04),

OUT_Z_MSB (0x05), OUT_Z_LSB (0x06) registers

These registers contain the X-axis, Y-axis, and Z-axis 14-bit left-justified sample data expressed as 2's complement numbers.

The sample data output registers store the current sample data if the FIFO buffer function is disabled, but if the FIFO buffer

function is enabled the sample data output registers then point to the head of the FIFO buffer which contains up to the previous

32 X, Y, and Z data samples.

The data is read out in the following order: Xmsb, Xlsb, Ymsb, Ylsb, Zmsb, Zlsb for CTRL_REG1[f_read] = 0, and Xmsb, Ymsb,

Zmsb for CTRL_REG1[f_read] = 1. If the device is operating in hybrid mode and M_CTRL_REG2[hyb_autoinc_mode] = 1, The

data read out order is acceleration Xmsb, Xlsb, Ymsb, Ylsb, Zmsb, and Zlsb followed by magnetic data Xmsb, Xlsb, Ymsb, Ylsb,

Zmsb, Zlsb. Similarly, for CTRL_REG1[f_read] = 1, only the MSB's of the acceleration and magnetic data are read out in the same

axis order.

If the CTRL_REG1[f_read] bit is set, auto increment will skip over the LSB registers. This will shorten the data acquisition from

7 bytes to 4 bytes, If the LSB registers are directly addressed, the LSB information can still be read regardless of the

CTRL_REG1[f_read] register setting.

die_temperature[7:0]

Figure 26. TEMP register

Acquire

Standby

No Sleep

Standby

Sleep

Active Mode

Auto-Sleep Mode

SLP_COUNTER <

SLP_COUNTER >

ASLP COUNT

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