Usb Series Termination Resistors

The usb specification requires usb downstream ports to be terminated with pull down resistors from the d and d lines to ground. This impedance includes the impedance of the usb transceiver.

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The following table provides the values used for the dfps rp based on the current sourcing capability of the type c port and the voltage that is connected to the rp.

Usb series termination resistors. 22ohm 1 resistors have been used in this example. The adapter is either a usb standard a legacy plug or a usb micro b legacy receptacle on one end and the usb type c plug on the other end connected to a ufp. This is the classic case where philips expects you to look up the usb spec with little knowledge of whats actually in the pdiusbd11.

For more information about the functional description and value of rp refer to section 45322 and table 4 10 of the usb type c specification revision 11. The usb specification requires that the usb device have a 45 w single ended or 90 w differential impedance. Usb termination resistors the data sheet would suggest some series termination resistors are required to connect the transceiver to the usb cable.

In addition to the requirements of termination and emc compatibility the computing devices are. A usb 20 compliant downstream facing device hub or host must support all three modes high speed full speed and low speed. On the implementation of usb systems the radiated and conducted emi should be kept within the required levels as stated by the fcc regulations.

The type c cable needs to expose a pull down termination ra on its vconn pin to signal to the dfp that it needs power. Typical full speed usb schematics 21 termination resistors in fig 1 there are two 33 w resistors r1 and r2 that are required for proper usb operation. Power v bus one of the benefits of usb is bus powered devices devices which obtain its power from the bus and requires no external plug packs or additional cables.

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