I have seen many questions on strapping pins, but none that address my question exactly, which makes me worry if it is a silly question... I am designing a custom ESP32-C3 board with ESP32-C3-WROOM-02 module, and I see the three strapping pins and the explanation in the datasheet - I think for "normal" operation, I just want SPI boot mode (please feel free to correct me if I'm wrong), but nothing says what happens if I leave GPIO2 floating or if it gets pulled to ground. The technical manual and datasheet are pretty clear that both GPIO8 and 9 cannot both be low during boot, but it's oddly silent about pin2. Does anyone have any experience with this pin? Worst case scenario I will just put a jumper to test it out myself, but I am curious why there is so little documentation around it.
Also I plan on programming and debugging using OpenOCD and a J-Link, does this make any difference with the strapping pins? Thanks!
Strapping pins (vz GPIO2) on C3
Re: Strapping pins (vz GPIO2) on C3
Hi,
IO2 + IO8 should be pulled up
IO9 you can leave floating and ground when you want it to go into download mode
At least that's what I'm doing.
-- john
IO2 + IO8 should be pulled up
IO9 you can leave floating and ground when you want it to go into download mode
At least that's what I'm doing.
-- john
Re: Strapping pins (vz GPIO2) on C3
What you said is What excatly I am worried about.
There is little descrition about IO2 in the guideline and I do not see IO2 be pulled up or down in the schematic of the official deckitC.
I want to have a Automatic Download Circuit in my design so I think it is better to pulled up the IO2 to make sure the circuit works.
Is there Anybody could answer the question or give me some advice ?
Thanks A Lot.
There is little descrition about IO2 in the guideline and I do not see IO2 be pulled up or down in the schematic of the official deckitC.
I want to have a Automatic Download Circuit in my design so I think it is better to pulled up the IO2 to make sure the circuit works.
Is there Anybody could answer the question or give me some advice ?
Thanks A Lot.
Re: Strapping pins (vz GPIO2) on C3
After reset, IO2 is set as input and in an high impedance state. Although not strictly necessary as I have made boards without a pullup, I would recommend it.
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