GPIO output source resistance

Question

What is the source resistance for the GPIO pin when driven high and configured as following: 
 
 Output, Standard 0.5mA drive, No pullup, S0S1 
 Output, High 5mA drive, No pullup, H0H1

Håkon Alseth · Accepted Answer

Hi, 
 We do not have specification for this parameters, but by looking at the guaranteed voltage area for the output, you can do some simple calculation to find the resistance. 
 In both "High" and "Standard", we guarantee that the voltage shall be within VDD-0.3V when setting the output. 
 The equivalent resistance can then be calculated: 
 Re = delta(U) / I
 
 For "Standard" 0.5 mA: 
 Re = 0.3 V / 0.0005 A = 600 ohm 
 
 For "High" 5 mA: 
 Re = 0.3 V / 0.005 A = 60 ohm
 
 Cheers,
Håkon

GPIO output source resistance

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