CapSense Schematic Design
AN66308 - CY8CMBR2044 CapSense® Design Guide, Doc. No. 001-66308 Rev. *F
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Button Auto Reset (ARST)
Button Auto Reset determines the maximum time a GPOx is driven when CSx is continuously touched. This feature
prevents a button from getting stuck if a metal object s placed too close to it. The ARST period can be configured to
be 5 seconds or 20 seconds. The Button Auto Reset is defined in
and shown in
Table 3-1. ARST Pin Configuration
ARST Pin Connection
Button Auto Reset Period
(seconds)
Ground
5
5 kΩ (10%) resistor to ground
20
VDD or floating
No Limit
Figure 3-2. Button Auto Reset
CS0
GPO0
Auto Reset period
GPO0 is not driven after
Auto Reset period
Button is touched for more
than the Auto Reset period
After the GPOx is turned off because of Button Auto Reset feature and after the button is released, do not touch the
button for a specific amount of time (T) given, as follows:
T equals 220 ms, if the CSx input is released within 2 seconds after Button Auto Reset period is elapsed.
T equals 220 ms plus the Button Scan Rate, if the CSx input is released after 2 seconds, after Button Auto
Reset period is elapsed.
Toggle ON/OFF
When Toggle ON/OFF is enabled, the state of GPOx changes on every rising edge of CSx. Toggle ON/OFF
configuration is defined in
Table 3-2. Toggle/FSS Pin Configuration
Toggle/FSS Pin Connection
Toggle ON/OFF
FSS
Ground
Disabled
Disabled
1.5 k
Ω
(5%) resistor to ground
Enabled
Disabled
5.1 k
Ω
(5%) resistor to ground
Disabled
Enabled
V
DD
Enabled
Enabled