In the actual application of NFC wireless charging, the Listener side is a TAG chip, which is divided into EEPROM area and SRAM area (the reason is that data will be erased and written cyclically during the entire charging process. EEPROM has a limit on the number of erasing and writing. The actual process is carried out in SRAM. ), the static charging CAP information is written in the EEPROM area by default, so that after entering the market, Poller reads the information, defaults to static charging and keeps the field normally open. When the Listener side detects that the field is turned on, it will open the mapping (after it is turned on, the poller side will read the value from the sram when reading the information), and write the CAP information into the SRAM. The charging state is negotiated charging; the
entire charging process is as shown below Shown:
