search

rusefi / alphax-4chan

3 stars 4 forks source link

Disable pull-up on CKP/CMP while staying in Hall mode #83

Closed ElDominio closed 1 year ago

ElDominio commented 1 year ago

For externally pulled-up hall sensors or using Max9926

For more context, I used a MAX9926 on a car that was having issues with the built-in VR module, and it worked fine for a while. Apparently now it's not pulling to ground properly, leading me to believe that disabling the 5V pullup will make the 9926 work correctly, since the 9926 seems to be outputting the correct signal when not connected to the ECU.

mck1117 commented 1 year ago

Set the pullup mode to VR. Controlling the pullup is the only thing it does.

ElDominio commented 1 year ago

Does it not make it "look" at the VR Threshold?

mck1117 commented 1 year ago

nope, the VR input is separate to the MCU, so it doesn't matter what the VR conditioner circuit is doing.

mck1117 commented 1 year ago

nope, the digital input circuit is separate.

ElDominio commented 1 year ago

Thank you for the clarification!