LFSTBEB865X Freescale Semiconductor, LFSTBEB865X Datasheet - Page 58

• Manufacturer Part Number: LFSTBEB865X
• Description: Acceleration Sensor Development Tools EVB FOR MMA865xQ
• Manufacturer: Freescale Semiconductor

Specifications of LFSTBEB865X

• Rohs: yes
• Tool Is For Evaluation Of: MMA8652FC, MMA8653FC
• Acceleration: 2 g, 4 g, 8 g
• Sensing Axis: Triple Axis
• Interface Type: USB

58
settings
Settings
Overall
Single Tap
Screen
frame
Default Single Tap
Default Single +
Double Tap
LPF Enable
HPF Bypass
• Enable X SP
• Enable Y SP
• Enable Z SP
Enable Latch
Pulse Time Limit
slider
Set Time Limit
Reset Time Limit
• X Threshold
• Y Threshold
• Z Threshold
sliders
Set XYZ
Thresholds
Reset XYZ
Thresholds
Field or option
Table 18. Full-System Evaluation – Pulse Detection screen
Sets the parameters for detecting single taps to the factory-defined values.
Sets the threshold for detecting single and double taps to the factory-defined values.
LPF = Low-Pass Filter
Sends accelerometer data through a low-pass filter before it (the data) is processed by the
tap application.
The low-pass filter treats higher frequency signals as noise, filtering out very fast shocks,
to prevent them (the fast shocks) from being detected as taps.
HPF = High-Pass Filter
Sends the raw accelerometer data to the tap application, bypassing the high-pass filter.
(Enable Single Pulse)
Allows taps along these axes to trigger the “Event Detected” Indicator on the Tap Status
frame.
For example, to see only taps on the top of the device, clear the X and Y SP boxes.
Causes any triggered event to remain until the Status register is read.
If the Enable Latch checkbox is not enabled, then the interrupt will only last as long as the
event, and the Status register will represent the most-recent event.
Sets the maximum time that a tap can last before it is ignored (i.e., it is not considered a
tap).
Click Set to register the new
settings with the device.
Click Reset to enable a new
configuration.
Sets the g threshold for a
tap to be detected along the
designated axis.
Pulses with a G value less
than the setting will be
ignored.
Click Set to register the new
settings with the device.
Click Reset to enable a new
configuration.
MMA865xFC Sensor Toolbox User’s Guide, Rev. 0
• The HPF Bypass option button normally should be cleared.
• Disabling the high pass filter can cause non-tap events (such as tilting the device) to be
registered as taps.
• Before changing the Pulse Time Limit slider,
• After changing the Pulse Time Limit slider
• Before using the axis threshold sliders,
• After using the axis threshold sliders,
click Reset Time Limit.
click Set Time Limit.
click Reset XYZ Thresholds.
click Set XYZ Thresholds.
Description
Freescale Semiconductor, Inc.