theboot900
Well-known member
I've designed a DIY Teensy 4.1 based board with Sdram with the idea of being able to solder it yourself. (It requires a stencil and solder paste as well). I don't have a hot plate, so i have been heating them with hot air from underneath. It uses the BGA 12x12 chip. Like dog bones board it uses the teensy micromod sized flash chip.
Possibly due to my routing (I had trace lengthed them) the Sdram runs fine overclocked at 198mhz, but at 220mhz overclock it gets some errors. I'm only a hobbyist and this is the first 4 layer board i've done. Maybe someone will find it useful.
All the files are at https://github.com/theboot999/Teensy-DIY
- No special manufacturing. $4 for 5 boards from jlcpcb
- Excel file with complete component listing, quantities and Links to all required components on mouser.
- Full schematic, Kicad board and Gerber files
- Printable PDF showing all components placings for easy reference when placing parts.
- Small form factor. Same length as teensy 4.1. 20mm wider than teensy 4.1.
- Smallest component is 0603
- All but 2 components are on one side of the board. 2 capacitors will need to be hand soldered afterwards.
- 60 IO pins exposed
- GPIO7 - all 32 bits exposed
- GPIO6 - upper 16 bits exposed
- 32mb Sdram using dogbones sdram library.
- Sd card
- Full part listing with quantities and mouser links for parts
- Can be powered by Usb 5v. Or remove the bridge from Usb to voltage regulator and it can be be powered exclusively through 3.3v pin (recommended to use a linear 3.3v input supply)
Possibly due to my routing (I had trace lengthed them) the Sdram runs fine overclocked at 198mhz, but at 220mhz overclock it gets some errors. I'm only a hobbyist and this is the first 4 layer board i've done. Maybe someone will find it useful.
All the files are at https://github.com/theboot999/Teensy-DIY