Datasheet

584
32133D–11/2011
UC3D
27.7.7 Autonomous/DMA Touch Configuration Register 3
Name:
ATCFG3
Access Type: Read/Write
Offset: 0x1C
Reset Value: 0x00000000
• PTHR: Positive Recalibration Threshold
For the autonomous QTouch sensor and DMATouch sensors, specifies how far a sensor’s signal must move in a positive
direction from the reference in order to cause a recalibration.
• PDRIFT: Positive Drift Compensation
For the autonomous QTouch sensor and DMATouch sensors, specifies how often a positive drift compensation should be
performed. When this field is zero, positive drift compensation will never be performed. When this field is non-zero, the positive
drift compensation time interval is given by the following formula:
Tpdrift = PDRIFT * 65536 * (sample clock period)
• NDRIFT: Negative Drift Compensation
For the autonomous QTouch sensor and DMATouch sensors, specifies how often a negative drift compensation should be
performed. When this field is zero, negative drift compensation will never be performed. When this field is non-zero, the
negative drift compensation time interval is given by the following formula:
Tndrift = NDRIFT * 65536 * (sample clock period)
With the typical sample clock frequency of 1 MHz, PDRIFT and NDRIFT can be set from 0.066 seconds to 16.7 seconds
with 0.066 second resolution.
31 30 29 28 27 26 25 24
-
23 22 21 20 19 18 17 16
PTHR
15 14 13 12 11 10 9 8
PDRIFT
76543210
NDRIFT