TE0835-REV02 Power Sequencing

[chris_ftl]

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

[mch]

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