FXOS8700CQ datasheet(21/86 Pages) FREESCALE

21 / 86 page

Sensors

Freescale Semiconductor, Inc.

7.8

Pulse detection

FXOS8700CQ has embedded single/double and directional pulse detection. This function employs several timers for

programming the pulse width time and the latency between pulses. The detection thresholds are independently programmable

for each axis. The acceleration data input to the pulse detection circuit can be put through both high and low-pass filters, allowing

for greater flexibility in discriminating between pulse and tap events. The PULSE_SRC register provides information on the axis,

direction (polarity), and single/double event status for the detected pulse or tap. For more information on how to configure the

device for pulse detection, please refer to Freescale application note AN4072.

7.9

Orientation detection

FXOS8700CQ has an embedded orientation detection algorithm with the ability to detect all six orientations. The transition angles

and hysteresis are programmable, allowing for a smooth transition between portrait and landscape orientations.

The angle at which the device no longer detects the orientation change is referred to as the “Z-lockout angle”. The device operates

down to 29° from the flat position. All angles are accurate to ±2°.

For further information on the orientation detection function refer to Freescale application note, AN4068.

7.10

Acceleration Vector Magnitude detection

FXOS8700CQ incorporates an acceleration vector magnitude change detection block that can be configured to generate an

interrupt when the acceleration magnitude exceeds a pre-set threshold for a programmed debounce time. The function can be

configured to operate in absolute or relative modes, and can also act as a wake to sleep/sleep to wake source. This function is

useful for detecting acceleration transients when operated in absolute mode, or for detecting changes in orientation when

operated in relative mode.

7.11

Magnetic Vector Magnitude detection

FXOS8700CQ incorporates a magnetic vector magnitude change detection block that can be configured to generate an interrupt

when the magnetic field magnitude exceeds a pre-set threshold for a programmed debounce time. The function can be

configured to operate in absolute or relative modes, and can also act as a wake to sleep/sleep to wake source.

7.12

Magnetic Threshold detection

FXOS8700CQ incorporates a magnetic threshold event detection block that can be configured to generate an interrupt when the

magnetic field on the enabled axes is above or below a programmed threshold.

Two logic combinations are possible for the detection: all of the enabled axes below their respective thresholds (AND condition),

or any of the enabled axes above their respective thresholds (OR condition). Even detection may be filtered using a dedicated

debounce counter to avoid spurious event detection. The thresholds for each axis are individually programmable and the function

can also act as a wake to sleep/sleep to wake source.

7.13

Magnetic Min/Max detection (autonomous calibration)

FXOS8700CQ incorporates a magnetic min/max detection circuit that can be used to automatically track the minimum and

maximum field values measured on each of the X, Y, and Z axes. The stored minimum and maximum values may optionally be

used to determine the magnetic hard-iron compensation and load the offset registers with the appropriate correction values.

FXOS8700CQ bảng dữ liệu(PDF) 21 Page - Freescale Semiconductor, Inc

FXOS8700CQ bảng dữ liệu(HTML) 21 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86

bảng dữ liệu tải về

Link URL