CC1310: What are the GPIO "weak" pullup and pulldown resistor values hinted in the datasheets?

Mark Wagner48

Part Number: CC1310

What are the GPIO "weak" pullup and pulldown resistor values hinted in the datasheets? I see a reference to GPIO leakage current but 217uA is not what I consider "weak", so I'm unsure if this is indicating the general GPIO pullup/pull down values.

over 6 years ago

0 RGW over 6 years ago

TI__Mastermind 33150 points

Agree that the definition of "weak" pullup / pulldown is quite vague but the values do indicate the general GPIO pullup / pulldown values.

//Richard

0 Mark Wagner48 over 6 years ago in reply to RGW

Prodigy 140 points

Ok, just to confirm, document: SWRS181D –SEPTEMBER 2015–REVISED JULY 2018
Pg. 29 states for GPIO pullup current = 277uA, which would suggest a pullup of 13,718 ohms (for Vdds=3.8)
and GPIO pulldown current = 113uA, which would suggest a pulldown of 33,628 ohms.

Am I correct in my assumptions?

0 TER over 6 years ago in reply to Mark Wagner48

TI__Guru**** 317180 points

The pull-up and pull-down are implemented with a transistor bias in the linear region. Hence the impedance will have variation with supply and temp. Based on the numbers in the datasheet you can calculate the impedance based on the current for the Vdd/ temp stated in the datasheet.

0 RGW over 6 years ago in reply to Mark Wagner48

TI__Mastermind 33150 points

Correct, but as TER mentions it is not a pure resistance.

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CC1310: What are the GPIO "weak" pullup and pulldown resistor values hinted in the datasheets?