ws1830S NFC 原理图，程序，pCB
包含 芯片手册，原理图，pcb ,spi通讯程序，nfc读写等一系列操作，近场通信（Near Field Communication，简称NFC）.
Type A型卡在读写机上向卡传送信号时，是通过13.56MHz的射频载波传送信号。其采用方案为同步、改进的Miller编码方式，通过100%ASK传送；当卡向读写机具传送信号时，通过调制载波传送信号。使用847kHz的副载波传送Manchester编码。
而Type B型卡在读写机具向卡传送信号时，也是通过13.56MHz的射频载波信号，但采用的是异步、NRZ编码方式，通过用10%ASK传送的方案；在卡向读写机具传送信号时，则是采用的BPSK编码进行调制。
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