Specifications

Wireless-Tag Technology Co., Ltd. V1.0.0
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 Programmable bit order with MSB or LSB first
 Simple half duplex communication
 Switch TX / RX pin configuration
 Disconnection signal transmission ability of LIN master and disconnection signal detection
ability of LIN slave
 When the UART is set to LIN mode, there are a 13-bit disconnect signal generator and
disconnect signal detection functions
 Smartcard mode
 Supports T=0 and T=1 Smartcard asynchronous protocol declared by ISO/IEC7816-3
standard
 1.5 stop bit length used in Smartcard
 Supports ModBus communication
 Timeout detection function
 CR/LF character recognition
 Noise detection
4.20 Audio Interface (PDM)
PDM (Pulse Density Modulation) is a modulation technique that uses digital signals to represent analog
signals. PCM, also as a technique of converting analog to digital by taking regular samples at uniform
intervals, expresses the amplitude of each sampled analog signal as N-bit digital component
(N=quantization depth). So the result of each sample in PCM method is always data of N-bit word length.
PDM uses a clock with a sampling rate much higher than PCM’s to sample and modulate the analog
components, and only one bit is output, either 0 or 1. Therefore, digital audio expressed by PDM is also
called Oversampled 1-bit Audio. Compared with a series of 0 and 1 in PDM, the quantization result of
PCM is more intuitive and simple.
4.21 Bluetooth(BLE)
BLE5.0/5.1 Bluetooth protocol.