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optocoupling JTAG - help needed

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L

leszcz

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jtag optocoupler

Dear all,
I designed a board that uses optocoupler ADUM2401 in order to isolate JTAG(connected to PC) and microcontroller board (MSP430f1116). Unfortuanately it will not work.

I noticed on the osciloscope that the JTAG steps up the signal levels and probably waits for uC to answer. However, while the optocoupler are finished with schmitt-trigger these voltages can only be converted to high or low.

I dont know how exactly works JTAG while initialising connection, maybe someone have had similar problem and can help me with that. Its very important for me and urgent.

Thank u for all answers or ideas.
Regards
 

Just kindly reminder: ADuM2401 is a magnetic coupler, not an optocoupler.

I am not sure, but it might be related to the magnetic technology's saturation problem (you know transformers' structure). Optocouplers dont have these problems due to their optic technology.Why dont you use a real optocoupler? E.g. from Avago. What is your data rate or tPLH, PWD requirements?

Cheers
 

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