AR1100 Datasheet, PDF (11/58 Pages) Microchip Technology – AR1100 Resistive USB and RS-232 Touch Screen Controller

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER
3.4 ESD Considerations
Suggested ESD protection is shown on the reference
schematic (See FIGURE B-1: “Schematic”).
Additional/alternate ESD countermeasures may be
employed to meet application-specific requirements.
Test to ensure the selected ESD protection does not
degrade touch performance.
Note:
ESD protection diodes are recommended
for all active sensor lines but care should
be taken to minimize capacitance. As an
example,
PESD5V0S1BA
is
recommended and used on reference
designs due to its nominally-low 35 pF.
3.5 Noise Considerations
Touch sensor filtering capacitors are included in the
reference design schematic (See FIGURE B-1:
“Schematic”).
Note:
Changing the value of the sensor filter
capacitors may adversely affect touch
performance.
 2011 Microchip Technology Inc.
DS41606B-page 11