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I am working on an electronic design that was previously completed by a third party. This designed board has a Raspberry Pi Zero 2W attached, an Ethernet controller module based on the ENC28J60, and an RJ45 connector. This Ethernet controller module is similar to the GeeekPi ENC28J60 Overlays HAT V1.02 board.
The issue is that the Raspberry Pi is unable to establish a network connection via Ethernet, as the ENC28J60 chip is not even recognized. I have checked the Raspberry Pi’s configuration, and it is correct and consistent with the chosen SPI pins. While reviewing the design, I noticed some things that caught my attention and differ from what is specified in the ENC28J60 datasheet. In the following photo, the most important issues are highlighted in red, and in orange, I have marked things I am unsure about regarding their functionality:
-The Bias resistor is 2K instead of 2.32K.
-A ferrite bead is missing.
-In the datasheet, the center tap of the RD+/- transformer is not powered by 3.3V.
-The chip’s OSC1 input is connected to OSCOUT and OSC2 to OSCIN.
I would appreciate it if you could help me determine whether these identified issues could be critical for its operation, or if I need to look for the problem elsewhere.
Thank you in advance.
The issue is that the Raspberry Pi is unable to establish a network connection via Ethernet, as the ENC28J60 chip is not even recognized. I have checked the Raspberry Pi’s configuration, and it is correct and consistent with the chosen SPI pins. While reviewing the design, I noticed some things that caught my attention and differ from what is specified in the ENC28J60 datasheet. In the following photo, the most important issues are highlighted in red, and in orange, I have marked things I am unsure about regarding their functionality:
-The Bias resistor is 2K instead of 2.32K.
-A ferrite bead is missing.
-In the datasheet, the center tap of the RD+/- transformer is not powered by 3.3V.
-The chip’s OSC1 input is connected to OSCOUT and OSC2 to OSCIN.
I would appreciate it if you could help me determine whether these identified issues could be critical for its operation, or if I need to look for the problem elsewhere.
Thank you in advance.
