i have question about the micro usb shield connector question. should the usb shield connector(6,7 pin) be connected to the ground as shown in attached picture?
i looked at different usb micro B connection, i see different interfacing circuits such as the D+,D- are sometimes directly connected, sometimes they put resistors(22ohm or 27ohm) resistors and also capacitors to the ground in the D+,D- lines. what is the difference? should we connect D+,D- directly to microcontroller or via resistors and capacitors to the ground?
Klaus is right. Different manufacturers have different recommendations for USB connections. I have designed many boards with FTDI chips and have always used a combination of res/cap on data lines. This on some ocasions helps to pass EMC/EMI certification.