What is the purpose of connecting two 5.1K resistors to the two middle pins of TYPE-C?

普拉卡图

What is the purpose of connecting two 5.1K resistors to the two middle pins of TYPE-C? [Copy link]

As shown in the picture, two 5.1K resistors are connected in series in the middle of TYPE-C. What is the use of this connection method?

wangerxian

Is the other end of the resistor grounded? It seems to be used to identify the master and slave devices.

tagetage

USB-PD relies on these two pins to identify the power supply device and request power supply from the power supply end. In a simple design, CC1 and CC2 can be pulled down to ground through a 5.1k resistor independently. For embedded designs that require high-power power supply or high-definition video transmission functions, a USB-PD control chip must be used.

qwqwqw2088

Used to identify devices. If the resistance value is within a certain range, the device is plugged in. This is stipulated by the interface standard protocol.
Generally, the USB impedance matching resistor is about 4.7K~5.1K, which can be identified.

jyb271126848

It should be used for matching, and generally this kind of resistor is used for matching.

菜鸟L

After adding it, it can support charging with dual type-C ports

吾妻思萌

This design seems to have an interface standard. I don't know if my picture is correct.