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Schematic Review (Seems like a problem to me!)
Posted: Sun May 03, 2020 10:57 am
by MCUism
- forum_upload.PNG (105.39 KiB) Viewed 5371 times
Hi team,
I have attached my schematic here. I sense some problems with my strapping pins. I want to directly upload the code from the Rx and Tx pins. Som for this did I configure my strap pins correctly? Shall I proceed with my Layout?
https://photos.app.goo.gl/ZQi6PmXs7GNxj5Rz8
Re: Schematic Review (Seems like a problem to me!)
Posted: Sun May 03, 2020 11:36 am
by mikemoy
You missed IO0. This is the pin that puts it in bootstrap mode.
Re: Schematic Review (Seems like a problem to me!)
Posted: Sun May 03, 2020 12:21 pm
by MCUism
mikemoy wrote: ↑Sun May 03, 2020 11:36 am
You missed IO0. This is the pin that puts it in bootstrap mode.
Hi mikemoy, how should I strap that pin? Should I pull down it? I think i wanna strap both GPIO0 and GPIO2 pulled down. Anyways IO2 is pulled down and IO0 must be pulled down for downloading the code using Rx and Tx?
Please do help me out on this. Thank you so much in advance.
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Re: Schematic Review (Seems like a problem to me!)
Posted: Sun May 03, 2020 12:26 pm
by mikemoy
The same way you strapped EN. But you wont need the cap.
Taken from the data sheet.
- Annotation 2020-05-03 072917.jpg (97.7 KiB) Viewed 5349 times
Re: Schematic Review (Seems like a problem to me!)
Posted: Sun May 03, 2020 5:59 pm
by MCUism
mikemoy wrote: ↑Sun May 03, 2020 12:26 pm
The same way you strapped EN. But you wont need the cap.
Taken from the data sheet.
Annotation 2020-05-03 072917.jpg
Hi mikemoy, can you also suggest me what care can I take while routing my RF trace to antenna. I am using this
https://www.snapeda.com/parts/2450AT18B ... datasheet/ antenna and having a 4 layer stack up.
Top -> RF Layer
Second -> GND Plane
Third-> VCC Plane
Bottom-> Signal layer
Please do suggest me what guidelines should I follow for this type of antenna
Re: Schematic Review (Seems like a problem to me!)
Posted: Mon May 04, 2020 12:48 am
by mikemoy
I cannot. Routing the antenna takes real special care for impedance matching. This is not something one can just try, you MUST know what you are doing.