Swapping over to RUSefi, 5v tolerance?
Posted: Thu Nov 19, 2020 11:40 pm
I have a board build as a piggy back controller for my ATV.
1000cc 80 degree Vtwin .
The board is a 2 piece design, where the analog signals, 2 injector drivers and 2 coil igbts are on the main board, and the daughter board basically is just a carrier for the teensy 3.5 that’s running speeduino.
All the signals except the crank trigger are 3.3v.
I just got a small little STM32F407 board in the mail yesterday, and I used an STlink to load the latest firmware on it, and it is small enough to use on my little piggyback unit. So I couldn’t resist soldering it up ( it’s only about a dozen wires since I’m just concerned with controlling 2 injectors and 2 coils.
I did a search on the internet to see what/if the stm32f407 pins are 5v tollerant, and got mixed results. So I thought I would ask here? Probably a safer bet just to tie a resistor to ground on that pin though. Using the max9926 as the VR interface with a 10k pull-up, so a 20k to ground should keep it happy.
Kind of excited to try RUSEfi on something, the problem with this ATV is there is just no room.
1000cc 80 degree Vtwin .
The board is a 2 piece design, where the analog signals, 2 injector drivers and 2 coil igbts are on the main board, and the daughter board basically is just a carrier for the teensy 3.5 that’s running speeduino.
All the signals except the crank trigger are 3.3v.
I just got a small little STM32F407 board in the mail yesterday, and I used an STlink to load the latest firmware on it, and it is small enough to use on my little piggyback unit. So I couldn’t resist soldering it up ( it’s only about a dozen wires since I’m just concerned with controlling 2 injectors and 2 coils.
I did a search on the internet to see what/if the stm32f407 pins are 5v tollerant, and got mixed results. So I thought I would ask here? Probably a safer bet just to tie a resistor to ground on that pin though. Using the max9926 as the VR interface with a 10k pull-up, so a 20k to ground should keep it happy.
Kind of excited to try RUSEfi on something, the problem with this ATV is there is just no room.