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It is highly likely that it was not a soldering problem, as during the first phases of the investigation, the chips that would later be deemed faulty were removed from the PCB and deadbug soldered onto an external board that was in turn connected to the original PCB via wires attached to...
For anyone that was wondering, replacing the chips solved the problem. So the issue was actually faulty chips. Need to investigate some more on how those chips became faulty...
Now that you mention it, I did forget to place proper decoupling. I am aware of the importance of them, but it went over my head. Nonetheless, after scoping the board, none of the EEPROM pins seems to have any spurious signal superimposed on the regular control signal. I2C switch with right...
What's happening is that the microcontroller is correctly putting on the bus the address of the device. The EEPROM is then supposed to pull down the data line on the 9th clock pulse to issue an ACK signal. The problem is that this is not happening. Scoping clock and data shows the correct...
Hello everyone,
I have been working at a design for a product that features the M24256-DFCS6TP/K I2C EEPROM by ST in the WLCSP packaging. A batch of PCBA were ordered from a company. When I started programming the boards, I noticed that the EEPROM did not work correctly on some boards. That is...
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