Hello,
We are trying to bringup a previously not working TE0835-REV02 SOM. This was retired due to a component being knocked off. This was repaired, however the unit will not complete powerup. The status LED blinks twice (IE is on twice). According to this: https://wiki.trenz-electronic.de/display/PD/TE0835+Getting+Started , there is a problem in stage 1, however I am unable to match this documentation to actual nets in the schematic.
Q1: the blink code is fairly inscrutable. Is a * or a "o" the LED on? Does the LED blinking twice actually correspond to stage 1?
Q2: Is there a document that maps these nets to actual schematic nets? Especially the supply enable lines, such as EN_GR1 or EN_PS_PL. These do not match which makes it difficult to find the supply that is amiss.
Thank you,
Chris
Hello Chris,
some of the nets in the schematic of the PCB REV03 have been changed. You can see the following document for the PCB REV02 at the link below:
https://www.trenz-electronic.de/trenzdownloads/Trenz_Electronic/Modules_and_Module_Carriers/6.5x9/TE0835/REV03/Firmware/Archive/SC-PGM-TE0835-0102_SC835-01_-v.29-01_20_2025.pdf
The "*" symbol indicates that the LED is on, and "o" indicates that the LED is off. I have also written the name of the nets of the PCB REV02 as old names in the current TE0835 CPLD document. Please take a look at the document at the following link:
https://wiki.trenz-electronic.de/display/PD/TE0835+CPLD#TE0835CPLD-ProductSpecification
Best regards,
Mohsen Chamanbaz