How to Use CC1101: Examples, Pinouts, and Specs

The CC1101 is a versatile, low-power RF transceiver designed for use in the ISM (Industrial, Scientific, and Medical) and SRD (Short Range Device) frequency bands. It supports various modulation formats and has a flexible data rate, making it suitable for a wide range of applications. Common applications include remote controls, home automation, wireless sensor networks, and security systems.

• Frequency Bands: 300-348 MHz, 387-464 MHz, and 779-928 MHz
• Modulation: FSK, GFSK, ASK/OOK, 4-FSK, MSK, and OOK
• Data Rate: Programmable from 0.6 to 600 kbps
• Supply Voltage: 1.8-3.6V
• Current Consumption: 15.6 mA in RX, 33 mA in TX (at +10 dBm)
• Sensitivity: -116 dBm at 1.2 kbps
• Output Power: Up to +12 dBm
• Operating Temperature Range: -40°C to +85°C

To use the CC1101 in a circuit, connect the VDD pin to a power supply within the specified voltage range and the GND pin to the system ground. The SI, SO, CSn, and SCLK pins are used for SPI communication with a microcontroller, such as an Arduino UNO. The GDO0 and GDO2 pins can be configured to provide various status signals and outputs.

• Ensure that the power supply is clean and within the specified voltage range.
• Use decoupling capacitors close to the VDD pin to filter out noise.
• Keep the antenna path as clear as possible from other metal objects.
• Follow the recommended PCB layout guidelines provided in the CC1101 datasheet.

#include <SPI.h>

// Define the CC1101 pin connections to the Arduino
const int CS_PIN = 10;
const int GDO0 = 2; // Can be configured in the CC1101

void setup() {
  // Initialize the SPI interface
  SPI.begin();
  pinMode(CS_PIN, OUTPUT);
  digitalWrite(CS_PIN, HIGH); // Ensure CS is inactive (HIGH)
  pinMode(GDO0, INPUT); // Configure GDO0 as input if used
}

void loop() {
  // Example code to send a simple "Hello" message
  sendMessage("Hello");
  delay(1000);
}

void sendMessage(const char *message) {
  selectCC1101(); // Select the CC1101 transceiver
  // Write your code to configure and send the message
  // ...
  deselectCC1101(); // Deselect the CC1101 transceiver
}

void selectCC1101() {
  digitalWrite(CS_PIN, LOW); // Activate the CS pin
  SPI.beginTransaction(SPISettings(1000000, MSBFIRST, SPI_MODE0));
}

void deselectCC1101() {
  SPI.endTransaction();
  digitalWrite(CS_PIN, HIGH); // Deactivate the CS pin
}

• No communication: Ensure that the SPI connections are correct and that the correct voltage is applied.
• Poor range: Check the antenna design and placement. Ensure there are no obstructions or interference.
• Intermittent operation: Verify power supply stability and use decoupling capacitors.

Q: Can the CC1101 be used for Wi-Fi or Bluetooth applications? A: No, the CC1101 is not designed for Wi-Fi or Bluetooth. It operates on different frequencies and protocols.

Q: What is the maximum range of the CC1101? A: The range depends on many factors, including output power, data rate, and environmental conditions. With optimal settings and conditions, it can reach several hundred meters.

Q: How do I configure the CC1101 for my specific application? A: Configuration is done through the SPI interface. Refer to the CC1101 datasheet for detailed register settings and configuration options.

Q: Is the CC1101 compatible with Arduino? A: Yes, the CC1101 can be interfaced with an Arduino using the SPI library, as shown in the example code.

For more detailed troubleshooting, refer to the CC1101 datasheet and user guide.