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MikeMcGlade

Mike McGlade

Mike has 16 years of experience with Microchip products including MCU, Memory & Analog.  He also has significant knowledge of lighting, safety & security and vending industries.

 


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  • Hello Nicole/Mike

    This is about finding links to recommendations for protecting the Microchip MCU programming pins against static. Traditionally these are unprotected but only accessible to service personnel, but we plan to allow general users to re-program our machines, so what extra ESD protection should we apply on the circuit board?

     

    These pins must be already quite rugged because millions of users have abused them over the years and so there might not be any concerns?

     

    I have searched the Microchip website resources and several user manuals and app notes. The ICD2 manual warns against adding excess capacitance or series resistance which makes sense but gives no detail.

    For such an established part of the system I expected to find a Microchip app-note with a recommended network , but no luck so far.

     

    I presume information on ruggedizing the ICD interface would be useful to all industrial MCU users?

     

    My next step would normally be to analyse the frequencies and drive capabilities of the PGC/PGD signals etc and then design protection networks using the appropriate EMI/ESD standards as a guide. We don't plan to zap the pins directly all the time but this could easily happen in a dry, high-static environment.

    It might be simplest just to pass each signals across a SIDAC-type device. 

    Thanks in advance

    Simon A

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  • Hello Nicole/Mike

    This is about finding links to recommendations for protecting the Microchip MCU programming pins against static. Traditionally these are unprotected but only accessible to service personnel, but we plan to allow general users to re-program our machines, so what extra ESD protection should we apply on the circuit board?

     

    These pins must be already quite rugged because millions of users have abused them over the years and so there might not be any concerns?

     

    I have searched the Microchip website resources and several user manuals and app notes. The ICD2 manual warns against adding excess capacitance or series resistance which makes sense but gives no detail.

    For such an established part of the system I expected to find a Microchip app-note with a recommended network , but no luck so far.

     

    I presume information on ruggedizing the ICD interface would be useful to all industrial MCU users?

     

    My next step would normally be to analyse the frequencies and drive capabilities of the PGC/PGD signals etc and then design protection networks using the appropriate EMI/ESD standards as a guide. We don't plan to zap the pins directly all the time but this could easily happen in a dry, high-static environment.

    It might be simplest just to pass each signals across a SIDAC-type device. 

    Thanks in advance

    Simon A

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