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Power consuption on GPIO pin
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Power consuption on GPIO pin

lpcy posted on 22 Feb 2012 11:56 PM PST
Member
6 Forum Posts

I want to connect a LED to GPIO Pin.

Which maximum current I'm able to use?

Re: Power consuption on GPIO pin

U2 posted on 22 Feb 2012 01:26 AM PST
Cypress Employee
589 Forum Posts

Which device are you trying to use? Could you be more specific? Moreover what is the drop across the Led. typically Leds will require anout 10mA of current. If your chip is say operating at 5V and if the drop across the Led is 1V, if you choose a resistor of 470ohm, you will get a current close to 10mA.

Re: Power consuption on GPIO pin

Sil posted on 22 Feb 2012 01:56 AM PST
Top Contributor
93 Forum Posts

This I am interested as well and wasn't able to get a clear statement from Cypress so far. In the datasheet the I/O pins are tested only at 100 uA. Hopefully we can get a bit more current than that....

 

-Silvio

Re: Power consuption on GPIO pin

aasi posted on 22 Feb 2012 02:21 AM PST
Cypress Employee
1073 Forum Posts

The drive strength of the GPIOs of FX3 is configurable. It rated for 13mA if configured for full drive strength.

LEDs have current ratings you've to select the drive strength configuration based on the LED you'll be using.

Regards,

Anand



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