Pic output current limit

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Murugesh_89

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In pic microcontroller data sheet it is given that
Maximum output current sourced by any I/O pin 25 mA
Maximum current sourced by all ports (-40°C to +85°C) 185 mA
Maximum current sourced by all ports (+85°C to +125°C) 70 mA

So how much an output pin can source???
 

If you are using only one pin, you can source up to 25mA.
But you cannot simultaneously source 25mA current from say 8 or above pins since that would more than 200mA which is more than the combined limit which is given to be 185mA.
 
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    IanP

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You already have answer in your own post: 25mA per pin
Conditions:
- temperature below 85degC
- maximum current sourced by all ports => <185mA
:wink:
IanP
 
Last edited:

IanP said:
- port means 8 pins, so the sum of 8 pins of the same port can not source more than 185mA ( 8 x 25mA > 185mA) ...
Click to expand...
The specification is actually
Maximum current sourced by all ports
Click to expand...
so that could be any number of pins depending on the device, not 8.

Also, be aware that while the PIC pins can sink 25mA this is not a usable current drive. Check the output high/low voltages/currents to check what you can usefully get from the device.

Keith.
 
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    IanP

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Maximum current sourced by all ports ...
so that could be any number of pins depending on the device, not 8.
Click to expand...
Thanks for pointing this out, Keith, it's ALL, not 8 ...

:wink:
IanP
 

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