I’m making a PCB for my thesis. The PCB includes the FT232H chip connected to USB-B port on the right side. On the left side i got the SX1276 breakout board, which does SPI communication to the FT232H. I would appreciate some feedback and suggestions from you. Thank you [review] [review_2]

it's not just the SX1276 alone. It's the SX1276 breakout board which i got from a manufacturer. According to them, the current consumption is 12mA during receiving. So i would say the FT232H VCCD (VCCIO) can supply enough current. In other cases, if there's not enough, can you please tell me what i…

[image] hquang275: it's not just the SX1276 alone. It's the SX1276 breakout board which i got from a manufacturer. According to them, the current consumption is 12mA during receiving. So i would say the FT232H VCCD (VCCIO) can supply enough current. So this is a receive only LoRa device ?

the key of my thesis is to implement USB interface and analyze using a USB sniffer (Openvizsla). I only need the communication from PC to FT232H to a chip - the Lora chip (so i only need one of the Lora chip function - receiving). So i would say yes

I used the export function from Kicad for capturing the schematic. For the layout, i simply screenshot it

[image] hquang275: can you elaborate on the positions of the bypass caps You have the multiple bypass caps for each supply located right next to each other. Instead, you should have one next to each IC supply pin. Sort-of like this: [image] (yes, this can make breaking out the signals ne…

[image] hquang275: So i would say the FT232H VCCD (VCCIO) can supply enough current. If you believe that is true then OK but I could not find any specification for maximun current draw on VCCD but the typical is only 54mA I would make sure before you go any further. In LoRa mode the SX1276 …

[image] hquang275: implementing a voltage regulator that takes input voltage from VBUS ? I'd do that, yes. Don't rely on the flimsy internal regulator of a USB-UART interface. There's some quirkiness in the schematic, such as two different labels for effectively the same power net (V3V3 & VC…

The junction capacitance (3000pF) of the TVS diodes is way to big for USB2 bus speeds and possibly for full speed mode as well. I think you need to spend some reading and understanding the datasheets of all the parts ans ICs used in your design. You need to get the schematic correct first before yo…

[image] hquang275: it's not just the SX1276 alone. It's the SX1276 breakout board which i got from a manufacturer. According to them, the current consumption is 12mA during receiving. What is the current consumption when transmitting? Lora involves each end of the comms link Transmitting and…

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hquang275 August 8, 2024, 9:48am 24

These are the newer versions of my board. I've added more test points, indicator led, arranged the positions of the capacitors.

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