CapSense Schematic Design
AN66308 - CY8CMBR2044 CapSense® Design Guide, Doc. No. 001-66308 Rev. *F
21
If the value of C
MOD
is found to be less than 1 nF or greater than 4 nF, all the buttons are disabled.
Button C
P
> 40 pF
If the parasitic capacitance (C
P
) of any button is found to be more than 40 pF, that button is disabled.
Figure 3-11.ExampleShowing CS), CS1 Passing the POST and CS2, CS3 Failing
5ms pulse
GPO3
GPO2
GPO1
(High)
GPO0
(High)
5ms pulse
Scan Rate/Sleep
Use this pin to set the button scan rate and sleep mode operation of the CY8CMBR2044. Do not leave this pin
floating.
Button Scan Rate
The button scan rate specifies the time between successive button scans by the device. An external resistor
determines the button scan rate for the CY8CMBR2044. You can use the
Cp, Power Consumption and Response
to determine the scan rate resistor value or
The button scan rate is configurable from
20 ms to 531 ms.
