Si4721 transceiver interface circuit
The single-chip FM transceiver uses Si4721 chip, and the interface circuit is shown in Figure 3. The working frequency of the chip is provided by an external 32.768 kHz crystal oscillator, which is connected to the RCLK and DCLK pins respectively.
The Si4721 communicates with the microcontroller through the I2-C bus compatible 2-Wire operating mode. The single chip computer controls the Si4721 to work in the transmitting mode or the receiving mode through instructions. The voice signal output from the voice circuit is input to the Si4721, and then is transmitted through the Si4721 internal radio frequency circuit and antenna. The single chip microcomputer makes Si4721 work in the receiving mode by sending the receiving mode command. Set the relevant frequency band, and the signal received from the antenna is finally output from the speaker through the Si4721.
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