Ed Taychert

What is causing MC9S08GT60 failure with high current draw?

Discussion created by Ed Taychert on Jun 13, 2006
Latest reply on Jun 20, 2006 by David Payne
This has happened twice now and with the few boards I've used, it amounts to about a 20% failure rate...

The first time was a on a DLP rf2z, (MC13191 RF & MC9S08GT60 board). It stopped working and, in looking at it it, I found 9 ohms across VDD and VSS.

On a second, in-house design, the board started browning out its regualator. After cutting the VDD pin on the MC9S08GT60, I found 16 ohms across it and ground...

No problems were found between VDDAD and VSSAD which were tied to VDD and VSS on both boards and both boards had dozens of hours of use before failure.

Have you seen anything like this?

I don't think it's ESD because there are a lot of other boards moving through here without problem, the only thing I see different from the other work and common to these two is the P&E USB multilink used for programming them... That hasn't shown any ill symptoms of its own but I'm getting worriied as my short pile MC9S08GT60 chips is only getting smaller.

- Ed.