mcu halt when a Contactor is turned on

[mustafa abdalrazeq]

i have a an stm32f417vgt6 mcu and its connected with ft800 through 30 cm SPI cable

and the ft800 is driving a tft lcd .. the problem is when the mcu turn on or turn off the Contactor

the mcu halt .. can you please help me how to detect the problem and how to solve it and what couse the problem

[S.Ma]

Bah, just twist the cable to make LVDS like cable.

Try to change the SPEED of the SPI GPIO and possibly put a serial resistor (1kOhm?) if really there are glitches around.

Remember that the parasitics are minimum if the electrical lines cross at 90 degrees (no crosstalk).

[mustafa abdalrazeq]

i will try your opinions and i will respond as soon as i finish them

thank you all

[Dvorak.Peter]

The so called halt is actually a crash.

An external arc interfered with the normal CPU operation.

The easy solution is to move all digital boards to the front panel.