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TWR-SENSOR OSBDM problem

Question asked by Martin Stankus on Oct 18, 2015

Hi everyone,

 

I'd like to ask for a help with onboard OSBDM in TWR-SENSOR module. I'm using Codewarrior 10.6, it automatically updates OSBDM firmware to the latest version. However TWR-SENSOR is unable to work with this latest version, target MCU is not powered. It seems that the problem is caused by wrong polarity of VTRG_EN signal, it should be active high in correct OSBDM implementation but TWR-SENSOR is wired in such a way that it is active low. Please see TWR-SENSOR schematic (SCH-26439, rev C) around transistor Q1 and some working board for comparison, for example TWR-S08MM128 (SCH-26136, rev D) around U2, described difference is evident here. Please, can someone from FSL confirm this errata? If yes, is there a software fix, that is latest OSBDM firmware with active low VTRG_EN polarity? If the software fix is not available, is there any recommended hardware workaround?

 

Thank you.

 

Best regards,

Martin

 

 

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