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What are the differences in drive strength between GPIO and SIO pins in PSoC 3/ PSoC 5LP?
GPIO pins can source 4 mA and sink 8 mA whereas SIO pins can source 4 mA and sink up to 25 Ma, which can be configured in the Output section of a Pin Component as shown in the following figure. The output Component uses SIO pin if Drive Level is set to VREF or Drive Current is set to a 25-mA sink. Ensure that you assign the Port 12 pins for this purpose which has SIO function.