[time-nuts] 5370 firmware hacking status report

Tijd Dingen tijddingen at yahoo.com
Mon Jul 25 20:32:28 UTC 2011


A quick check shows digikey sells them in single quantities, and has current stock.

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=ADUM4160BRWZ-ND


regards,
Fred



________________________________
From: John Seamons <jks at jks.com>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Sunday, July 24, 2011 11:05 PM
Subject: Re: [time-nuts] 5370 firmware hacking status report

On Jul 24, 2011, at 2:40 PM, Poul-Henning Kamp wrote:

> Ethernets big advantage is that it is galvanically isolated, USB is not.

You had mentioned this issue in February. And since I currently flash using USB I went ahead and bought the evaluation card for the Analog Devices ADuM4160 power/signal isolator chip (see last pic on jks.com). Even though I programmed the GPIO pins on the micro for open drain I didn't know if the +5 on the USB from the host computer would fight the signals from the 5370. Plus I didn't want the ground loop. So the isolator chip splits the power domains and the micro is powered by +5 from the 5370. Works great. But I haven't found anyone who sells the chip in small quantities yet.

You also had mentioned PyRevEng back then. I will try it. It will be very useful at this point.


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