LED driver enable pulled down

opencomputeproject / Time-Appliance-Project

Develop an end-to-end hypothetical reference model, network architectures, precision time tools, performance objectives and the methods to distribute, operate, monitor time synchronization within data center and much more...

MIT License

1.32k stars 101 forks source link

LED driver enable pulled down #77

Closed wisxxx closed 1 year ago

wisxxx commented 1 year ago

Ref: file "Timingcard_PROJECT.pdf", in Time-Card/HW/ECAD/Prototype-V7/ECADv7.7z

The new status LED driver, U6, on sheet 2 of the new schematic has pin 1 ("SDB") pulled to ground through a 100K resistor.

The data sheet description of this pin reads: "Shutdown the chip when pulled low". That would render the driver and LED's useless.

Also, the pulldown is bypass by a 0.1 uF cap. Why?

julianstj1 commented 1 year ago

This is a good catch. I corrected these issues in V8. I'll close this issue after uploading V8, please re-open if there are any other issues. Thank you!

julianstj1 commented 1 year ago

Updated in V8 in Experimental HW folder, will close for now.