30 Nov '14, 8pm

Solving a power rail error in an embedded processor board comes down to the decimal points on a data sheet:

We designed an embedded processor board that ran under Windows 7. When the hardware was deployed to the software developers, all was running fine until they had the platform software “sit” in a bootloader menu, which consisted of a list of options on the screen and a command prompt – sort of like a DOS shell but not running Windows. After a while, say 20 seconds to a few minutes, it was reported that the unit would shut down and the power manager chip (PMIC) would enable a red error light that indicated a power rail fault. The funny thing was the unit did everything it was supposed to do in Windows, which was the actual customer application. At first, we thought that in the menu mode, the watchdog timer was timing out or there was some other software bug, but we couldn’t figure out why the time to fail was so variable. At one point we thought it would happen when the mouse...

Full article: http://www.edn.com/electronics-blogs/tales-from-the-cube/...

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