CC2640 GPIO maximum input current

Weng Jine He

Intellectual 340 points

Other Parts Discussed in Thread: CC2640

Excuse me

In CC2640 datasheet I can't find the GPIO maximum input current.

Anybody know this value?

Thanks.

over 10 years ago

0 Christin Lee over 10 years ago

TI__Guru 57945 points

Hi,

There is no maximum rating for GPIO input current. As long as you make sure the voltage on the GPIO does not exceed VDDS, then you are fine.

0 Weng Jine He over 10 years ago in reply to Christin Lee

Intellectual 340 points

Hi Christin

So, the GPIO input current is unlimited. As long as the GPIO input voltage does not exceed VDDS ?

0 YiKai Chen over 10 years ago in reply to Weng Jine He

Guru 735705 points

Yes, that's it.

0 Weng Jine He over 10 years ago in reply to YiKai Chen

Intellectual 340 points

Hi YiKai

But, the real condition I test, the maxium input current is about 8.3mA.

And when the input current getting bigger, the GPIO's voltage getting bigger too.(GPIO is open drain & setting to LOW)

It is not match above description, why?

0 YiKai Chen over 10 years ago in reply to Weng Jine He

Guru 735705 points

Since GPIO input voltage cannot exceed VDDS, the maximum input current would happen on GPI input voltage=VDDS. When you get 8.3mA, what input voltage do you give to a GPI?

0 Weng Jine He over 10 years ago in reply to YiKai Chen

Intellectual 340 points

Hi Yikai

I use the power supply to feed current to GPIO.
When I got the maximum current, the GPIO input voltage is equal to the VDDS.
My confuse is when the input current getting bigger, the GPIO's voltage getting bigger too.
So, the input current can't say it is unlimited.

0 Fredrik K over 10 years ago in reply to Weng Jine He

TI__Guru** 106705 points

Hi Weng,

This is question of semantics. What Christin is saying is that there is no limit on the current into the IO in the specification, but there is a limit on the voltage. Of course, as Yikay wrote and you have figured out, one is dependent on the other. Thus, there is an indirect specification of the maximum current.

Sink/source capability on the CC26xx is fairly symmetrical, meaning that the maximum input current is similar to the maximum output current. This corresponds well with you measurement which shows a maximum input current of 8 mA.

Cheers,
Fredrik

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CC2640 GPIO maximum input current