The PD decoy chip is a PD protocol chip on the receiving end. It has a built-in PD communication module. Through handshake communication with the PD protocol chip on the power supply end (such as a PD charger), it can apply for the required voltage to power the product.
The biggest difference between the PD protocol charger and the traditional QC charger is that the PD charger uses Type-C interface output. The PD protocol requires pins such as CC pin, VBUS, GND, D+D-, etc., which has fast data transmission speed. , The charging current is large, the voltage is high, etc., and it can also support USB plugging, which is very convenient.
The PD trigger chip is mainly used at the receiving end, such as wireless charging, small appliances, aging devices, smart homes, etc. Moreover, the general LDR6328S PD receiving end chip supports the USB Power Delivery (PD2.0/PD3.0) power receiving end protocol, which tricks the appropriate voltage from the adapter/car charger to power the product.
PD decoy/trigger voltage principle:
In USB PD, a pair of directly connected ports uses the CC line in the USB Type-C connector as the communication channel to negotiate the voltage. When the devices with PD capabilities are successfully connected to each other, DFP and UFP are initially in the default working state of USB, DFP provides 5V voltage, UFP sink current is related to USB2.0, USB3.1, USB Type-C or USB BC1.2 The rules defined by the standard are consistent. After PD negotiation occurs, it can output a higher or lower voltage and higher current than the standard definition. It can also complete the role of PRS or FRS to exchange power supply, so that DFP becomes the receiving party and UFP becomes the power supplying party. At the same time, DRS can be used to turn DFP into UFP, and vice versa.
The PD protocol chip is also divided into a simple charging chip and a chip that transmits data and can be charged. The design requirements should be explained when using it.