Reset protection jumper

Reset protection jumper#59629

By E4ODnut - Wed Nov 16, 2022 9:14 pm

- Wed Nov 16, 2022 9:14 pm #59629

I had a look at the AVR040 application note to see if I could figure out what this reset protections circuit is all about, but I'm afraid it is a bit over my head. So, my question is, if reset protection is important should the JP1 jumper be shorted or left open. For that matter, if protection is important, why the jumper option?

Robert
2001 Dodge Ram 2500, 4x4, 8.0L V10, NV4500 manual, Dana 80 limited slip, extended cab, long box, custom EFI.

Re: Reset protection jumper#59651

By PSIG - Thu Nov 17, 2022 8:28 pm

- Thu Nov 17, 2022 8:28 pm #59651

JP1 is the ignition signal output voltage selection on all Speeduino board versions, and must be selected appropriately for ignition functions. What board are you using?

If you mean the run/prog switch or jumper, it enables or bypasses the reset protection circuit so the processor can be auto-reset on firmware upload, else it prevents accidental resets while operating or connected to comms.

-= If it was easy, everyone would do it =-

Re: Reset protection jumper#59660

By E4ODnut - Fri Nov 18, 2022 5:37 pm

- Fri Nov 18, 2022 5:37 pm #59660

Oops, typo. Should have been JP12. It appears on the power sheet in the KiCad schematic drawing Latest\V0.4.3d. So from your description I'm assuming the jumper should be left open for normal operation?

Robert
2001 Dodge Ram 2500, 4x4, 8.0L V10, NV4500 manual, Dana 80 limited slip, extended cab, long box, custom EFI.