Home Questions Tags Users Unanswered. Will it work properly given the conditions above.? TI is a global semiconductor design and manufacturing company. Currently the system the board will go in will always be sourced from a wall supply, so going into power down isn’t a huge necessity at the moment. The newly created question will be automatically linked to this question. How do i check whether an I2C device works? Dynamic IR drop analysis 7.

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And if i then plug the cable back in it does linjx connect again and manually typing ifup just fails to get lease from DHCP and there are no lights on the connector or hub.

Plugged in after the Kernel is started: TI, its suppliers and providers of content reserve the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice. Alright i stepped through the Kernel code and i found it was a powersave feature. According to the LANA datasheet the logic should detect the presence of the signals when plugged in and power back up.

Linux-4.1.15 : problem with LAN8720A

It’s almost 2x the specified and I noticed that the IC is a little hot. Does this theory sound correct? Nov 27, 7: Not lijux to run Proteus Simulation after building project in CooCox 2.


If i power off the switch and power it back on the phy also comes up. Distorted Sine output from Transformer 5. We are glad that we were able to resolve this issue, and will now proceed to close this thread. Dec 3, lsn8720a Related to source pull simulation for rectifier 0.

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However, the section of the LAN datasheet regarding Configuration Straps recommends adding external pull-up resistors to augment the internal resistor when the pin will be connected to a load. In the future if we progress to battery powered systems i will make modifications to do linix polling. DAC input digital signals, how to generate? This is to ensure that the pin reaches the required voltage level prior to latching, as the internal pull-up resistor is very weak libux resistance.

This configured the PHY for full auto-negotiation.

LAN8720 – Link brekdown with some devices

Due to the holidays, responses may be delayed. Short circuit protection in PCB design 5. Datasheet states that power consumption should be around 45mA with Mbit traffic. I setup the U-boot network stuff to not source the clocks, but i didn’t even think about it when setting up the kernel config, I simply set the muxes and called init for the correct mode. Currently the system the board will go in will always be sourced from a wall supply, so going into power down isn’t a huge necessity at the moment.


I looked at the Schematic of wavshare board and the schematic of LAN IC provided by Microchip and found a many difference in the schematics of both so thought of raising the question.

Heat sinks, Part 2: Nov 28, 8: Awesome, thanks for the reassurance! If you do not apply the configuration pulling resistors on your board, then the internal pull-ups on the LAN apply and the Waveshare board will default as follows: It is only when there is no activity on the port for a few seconds and i then plug the unit in that the phy does NOT come up. The ifplugd action executes and ifdowns eth0 when unplugged; however, I then almost immediately see: How to analyze power consumption in this low power design?

Linux source code: drivers/net/phy/smsc.c (v) – Bootlin

IEE Floating Point addition 7. In reply to Jarrod Cook:. These are my results ampermeter in series with LAN power pins, tested on custom board After reset, no cable connected – 42mA Power Down – 2.