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JTAG-SMT4 Decoupling Capacitors



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Hi @rpatel,

For the SMT4, I have been informed that the worst case for Vdd is 115 mA and the typical usage is 90 mA with JTAG running at max speed and UART running at 1 MBaud. The Vref current at 30 MHz is 12.5 mA typical and 35 mA max (unless you short the outputs, then Vref would probably peak out around 170 mA).

You didn't ask about minimums, but when the USB controller is held in reset, the current consumption is ~20 mA. When it comes out of reset and enumerates on the bus it's ~87.5 mA.

Let me know if you have any questions.


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