MMA865xFC Sensor Toolbox User’s Guide, Rev. 0
Freescale Semiconductor, Inc.
35
Tap
configuration
(both tap and
double tap)
• X Threshold
• Y Threshold
• Z Threshold
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.
• Before using the sliders, you must click the Reset XYZ Thresholds button.
• After using the sliders, click the Set XYZ Thresholds button.
Set XYZ
Thresholds
Note:
Before changing the values of the X, Y, or Z threshold sliders, click
Reset XYZ Thresholds.
After changing the value of any of the axis threshold slider settings, click
Set XYZ Thresholds.
Reset XYZ
Thresholds
Enable Latch
Causes any triggered event to remain until the Status register is read.
If this 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.
• The Enable Latch setting should be enabled for the tap detection to work properly.
• If Enable Latch is disabled, then tap events will trigger multiple interrupts, instead of
triggering a single interrupt.
Set Time Limit
Sets the Pulse Time
Limit.
Note:
Before resetting the value of the Pulse Time Limit slider,
click Reset Time Limit.
After changing the value of the Pulse Time Limit slider,
click Set Time Limit.
Reset Time Limit
Resets the Pulse Time
Limit.
Tap
configuration
(single tap)
• Enable X SP
• Enable Y SP
• Enable Z SP
(Enable Single Pulse)
Allows flicks along these axes to trigger the “Event Detected” Indicator on the Demo
Screen.
Pulse Time Limit
Sets the maximum time that a pulse can last before it (the pulse) is ignored as a non-tap
event.
• Before using the Pulse Time Limit slider, you must click the Reset Time Limits button.
• After using the Pulse Time Limit slider, click the Set Time Limits button to change the
setting.
Default Single Tap
Sets the parameters for detecting single taps to the factory-defined values.
To configure this frame’s other values, the Default Single Tap option button must be
cleared.
Tap
configuration
(double tap)
• Enable X DP
• Enable Y DP
• Enable Z DP
(Enable Double Pulses)
Enables detection of double pulses along the specified axis or axes.
For example, if you only want to see double taps on the right side of the device, then clear
the Z and Y DP checkboxes.
Pulse Latency
Sets the amount of time that the device waits after a pulse, before registering the next
pulse. Subsequent pulses that occur within this period are ignored.
Second Pulse
Latency
Sets the amount of time that the device will wait to reset, after receiving an initial pulse.
A pulse detected after the set time will be considered a new first pulse.
Ignore Latent
Pulses
Causes the device to ignore the Pulse Latency timer (set by the Pulse Latency Slider) and
to detect taps directly after other taps.
Default
Double Tap
Sets the threshold for detecting single and double pulses to the factory-defined values.
To configure this frame’s other values, the Default Double Tap option button must
be cleared.
Table 9. Directional Tap – Active/Standby screens (Continued)
Screen
frame
Field or option
Description