Classic CC2430 hardware application circuit

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The RF card terminal uses TI's CC2430 as the wireless RF chip. The chip is Chipcon's first RF system single chip that conforms to 802.15.14/Zigbee technology. Suitable for a variety of ZigBee or ZigBee-like wireless network nodes, including tuners, routers, and end devices. It has the advantages of very low cost, low power consumption, many network nodes and long transmission distance. It has the following main features: integrated RF radio transceiver conforming to IEEE802.15.4 standard; excellent wireless receiving sensitivity and strong anti-interference Hardware supports CSMA/CA functionality; digital RSSI/LQI support.

The hardware application circuit of CC2430 is shown in the figure below, because it takes into account that each employee of the radio frequency terminal needs to wear one. From the perspective of cost saving, a simple and typical design method is adopted. The circuit uses an unbalanced antenna and the connection is unbalanced. The transformer can make the antenna performance better.

Figure 1 CC2430 circuit application diagram

The balun in the circuit consists of capacitor C341 and inductors L341, L321, L331 and a PCB microwave transmission line. The whole structure meets the requirements of RF input/output matching resistor (50Ω). The internal T/R switching circuit completes the exchange between the LNA and the PA. R221 and R261 are bias resistors, and resistor R221 is primarily used to provide a suitable operating current for a 32 MHz crystal. A 32 MHz crystal resonator circuit is constructed with a 32 MHz quartz resonator (XTAL1) and two capacitors (C191 and C211). A 32.768 kHz crystal resonator circuit is constructed with a 32.768 kHz quartz resonator (XTAL2) and two capacitors (C441 and C431). The voltage regulator supplies power to all pins requiring 1.8V and internal power. The C241 and C421 capacitors are decoupling capacitors for power supply filtering to improve chip operation stability.