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USB impedance matching for STM32F103C6

Question asked by gregson.peter on Jan 24, 2014
Latest reply on Feb 5, 2014 by ME_Queen
Hello,
The USB specification for Full Speed requires 1.5Kohms from D+ to 3.6 volts, 15Kohms from D+ to ground, and 90 ohms between D+ and D-.  What matching resistors are required to achieve this with the STM32F103C6?  The data sheet does not suggest values, and it does not provide the input impedance of each of D+ and D- nor does it provide the differential impedance between D+ and D-.
Regards,

Peter 

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