AR1100-I MICROCHIP [Microchip Technology], AR1100-I Datasheet - Page 26

• Manufacturer Part Number: AR1100-I
• Description: AR1100 Resistive USB and RS-232 Touch Screen Controller
• Manufacturer: MICROCHIP [Microchip Technology]

6.1
(ADVANCED – DO NOT CHANGE)
The RisetimeCapTimeout value is used in the
proprietary
characteristics.
6.2
(ADVANCED – DO NOT CHANGE)
The RisetimeQuick value is used in the proprietary
algorithm associated with sensor characteristics.
6.3
The TouchThreshold value sets the threshold for
detecting a touch condition. A larger value relaxes the
criteria for detecting a touch and a small value is more
demanding.
6.4
The SensitivityFilter value sets a criteria for touch
‘stability’. A larger value is more sensitive to a touch but
possibly less ‘stable’. A smaller value requires a
‘harder’ touch but provides a more stable position.
6.5
The SamplingFast register sets the level of touch
measurement
movement is determined to be fast (reference
SpeedThreshold). A lower value will result in faster
reporting but may be more susceptible to noise in touch
positions. A higher value will reduce the report rate but
provide more immunity to random noise in the reported
touch positions.
6.6
The SamplingFast register sets the level of touch
measurement
movement is determined to be slow (reference
SpeedThreshold). A lower value will result in faster
reporting but may be more susceptible to noise in touch
positions. A higher value will reduce the report rate but
provide more immunity to random noise in the reported
touch positions.
6.7
The AccuracyFilterFast sets the level of touch
measurement accuracy enhancement used when the
touch movement is determined to be ‘fast’ (reference
SpeedThreshold). A lower value will increase touch
position resolution but may exhibit more noise in
reported touch positions. A higher value will decrease
touch position resolution but increase immunity to
noise in reported touch positions.
DS41606B-page 26
Register 0: RisetimeCapTimeout
Register 1: RisetimeQuick
Register 2: TouchThreshold
Register 3: SensitivityFilter
Register 4: SamplingFast
Register 5: SamplingSlow
Register 6: AccuracyFilterFast
algorithm
sample
sample
associated
averaging,
averaging,
with
when
when
sensor
touch
touch
6.8
The AccuracyFilterFast sets the level of touch
measurement accuracy enhancement used when the
touch movement is determined to be ‘slow’ (reference
SpeedThreshold). A lower value will increase touch
position resolution but may exhibit more noise in
reported touch positions. A higher value will decrease
touch position resolution but increase immunity to
noise in reported touch positions.
6.9
The SpeedThreshold value sets the threshold for touch
movement to be considered as ‘slow’ or ‘fast’. A lower
value reduces the touch movement speed that will be
considered ‘fast’. A higher value has the opposite
effect.
6.10
The DitherFilter value sets the threshold to prevent the
reported touch location from changing during what is
thought to be a stationary touch. The computed touch
position must change by an amount greater than Dith-
erFilter (either X or Y) before the reported position
changes.
6.11
The SleepDelay value sets the time interval (with no
touch or host communication) that will cause the
AR1100 to enter a low-power Sleep mode (UART
Communication mode only).
6.12
The PenUpDelay sets the time required for a pen-up
event/condition before the controller will send a touch
report with a pen-up status – effectively debouncing
pen up. The delay timer resets if a pen-down condition
is detected before the timer expires. A lower value will
increase the responsiveness of the controller to pen up.
A higher value will decrease the responsiveness.
Register 7: AccuracyFilterSlow
Register 8: SpeedThreshold
Register 9: DitherFilter
Register 10: SleepDelay
Register 11: PenUpDelay
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