Mikroelektronika MikroE Development Kits MIKROE-1105 Data Sheet

DocID022152 Rev 4

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supply voltage to supply the I/O pin circuitry and to charge/discharge the capacitive load 
(internal or external) connected to the pin:

where

I

SW

 is the current sunk by a switching I/O to charge/discharge the capacitive load

V

DD

 is the MCU supply voltage

f

SW

 is the I/O switching frequency

C is the total capacitance seen by the I/O pin: C = C

INT

+ C

EXT

The test pin is configured in push-pull output mode and is toggled by software at a fixed 
frequency.

I

SW

V

DD

f

SW

C

×

×

=