topic FS65 - Enable load dump feature on IO2 IO3 in Power Management

FS65 - Enable load dump feature on IO2 IO3

sandeepSingh18606 — Wed, 07 Oct 2026 06:34:50 GMT

I am currently working with the SBC FS65. According to the reference manual, IO2 and IO3 are not load dump proof. While IO0, IO4, and IO5 (with external protection) are load dump proof, IO4 and IO5 are being used for external IC monitoring.

This leaves only IO0 available for external connections, such as ignition or other wake-up sources.

Could you please clarify if we can make IO2 and IO3 load dump proof externally (similar to IO5) so that external loads can be connected to them?

Re: FS65 - Enable load dump feature on IO2 IO3

TomasVaverka — Wed, 07 Oct 2026 10:32:17 GMT

Hello Sandeep,

IO2 and IO3 are logic-level local inputs and are not designed to be connected directly outside the ECU. Their absolute maximum voltage range is only −0.3V to 8V.

If they must be used for an external wake-up source, a separate automotive-qualified, load-dump capable input-conditioning or level-shifting circuit would be required. This circuit must ensure that the voltage at IO2 or IO3 remains within the pin ratings under all normal and transient conditions and that the specified input thresholds are satisfied.

BR, Tomas

Re: FS65 - Enable load dump feature on IO2 IO3

sandeepSingh18606 — Thu, 08 Oct 2026 10:46:58 GMT

Hi Tomas,

Thanks for clarification.....