How can I implement the circuit for SIM A7670c with ESP32-S3 and 4G connectivity?
Hello @hereI'm designing a board with computer vision capability around an ESP32-S3.Also with 4G(LTE) connectivity. I want to use SIM A7670c chip for the connectivity. I need help to implement the circuit for SIM A7670c .
17 Replies
Have you been able to go through the Hardware design guide of the A7670c?
To integrate the SIM A7670C with your ESP32-S3 board, ensure a stable 3.8V power supply (with 2A peak), connect UART (TX/RX) for communication, and use level shifters if needed. Add a SIM card holder with proper pull-ups and ESD protection. Connect a 4G LTE antenna, and tie RESET and PWRKEY to GPIOs for control. Use the datasheet's reference design for passives and ensure your ESP32 firmware supports AT commands. Let me know if you need more details!
yes I have found a guide for A7670 series here is the link:https://nostris.ee/pdf/A7670%20Series%20Hardware%20Design_V1.00.pdf
According to the documentation it supports AT command.Thank your for the informations.
Welldone, page 32 you provide what you need as per design. If you need the exact part number for my sim tray and also the footprint, let me know, its available on JLCPCB(the sim tray)
I have some difficulties to find the symbol and footprint of SIM A7670c for Kicad.I'm using Kicad.
It's not available on kicad
You can check online if the symbol and footprint is available for download, if not you will have to create it yourself
Using the datasheet you can get the dimensions
Ok I got it.I found one but not sur if it's the right one.
Ok nice, cross check with the datasheet
I mean the pinout on the datasheet
it is the same as in the datasheet.the link for symbol/footprint here:https://componentsearchengine.com/part-view/SIM%20COM%20A7670/SIMCOM
Alright then you are good to go
@Fatogoma It's often not that hard to create your own symbols/footprints in KiCad, but you can also check something like SnapEDA which has a library of pre-drawn parts for download. https://www.snapeda.com/kicad/ - I've used something like that, but I'm not quite certain if that's the one I've used or not. I HAVE used easyeda2kicad as outlined here https://hackaday.com/2023/08/08/easyeda2kicad-never-draw-a-footprint-again/ for symbols/libraries and have had good success with the method, but as Afuevu noted, it's a good idea to check the pinout (etc) versus the datasheet of your part.
Download free KiCad libraries for millions of electron...
Download KiCAD schematic symbols, footprints & 3D models for millions of electronic components only at SnapMagic Search.
Arya Voronova
Hackaday
Easyeda2KiCad: Never Draw A Footprint Again
What if I told you that you might never need to draw a new footprint again? Such is my friend’s impression of the tool that she’s shown me and I’m about to show you in turn, havin…
I use snapeda more during design. If the component isn’t available I switch to componentsearchengine if not available then I create my own symbol or footprint 🙂