AR1100 Datasheet, PDF (28/58 Pages) Microchip Technology – AR1100 Resistive USB and RS-232 Touch Screen Controller

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER
6.15 Register 14: CalibrationInset
The CalibrationInset value specifies the ‘inset’ (margin)
from the edge of the sensor to the perimeter calibration
points. The remaining calibration points (for 9P and
25P) are evenly spaced between the margins. The
inset is in units of 1/256 of the sensor dimension(s) and
is 2x the margin – e.g. a value of 64 is 64/256ths of the
screen dimension (25%) – each margin (top, bottom,
left, right) is 12.5%.
6.16 Register 15: PenStateReportDelay
The PenStateReportDelay value sets the time delay
between successive touch reports in a multiple-report
sequence called for by TouchModes.
6.17 Register 17: TouchReportDelay
The TouchReportDelay value sets the time delay
between successive touch reports. This can be used to
reduce the volume/speed of touch reports, thereby
reducing the burden on the host to process the touch
reports.
6.18 Register 18: RisetimeDefault
(ADVANCED – DO NOT CHANGE)
The RisetimeModifier value is used in the proprietary
algorithm measuring and reacting to sensor
characteristic(s).
6.19 Register 19: RisetimeModifier
(ADVANCED – DO NOT CHANGE)
The RisetimeModifier value is used in the proprietary
algorithm measuring and reacting to sensor
characteristic(s).
6.20 Register 20: Status
The STATUS register provides useful feedback to the
host on AR1100 operational status.
Status[7:7]
Status[6:6]
Status[5:5]
Status[4:4]
Status[3:3]
Status[2:2]
Status[1:1]
Status[0:0]
TCHK
EEV
CALV
JMP
DRT
8W
5W
4W
Result of touch check diagnostic
Parameters in EEPROM were valid and automatically loaded
Calibration valid (EEPROM contains valid cal coefficients)
State of mode input 1: open (jumper off), 0: grounded (jumper on)
Dynamic risetime CAP successfully measured
Configured for 8W sensor (4W will also be set)
Configured for 5W sensor
Configured for 4W sensor
6.21 Register 21: Debug
The Debug register contains bit flags enabling various
debug functions.
DS41606B-page 28
 2011 Microchip Technology Inc.