CC1120RHBR Detailed explanation of pin function specifications and circuit principle instructions

The "CC1120RHBR" is a part from Texas Instruments, specifically the CC1120 series of sub-1 GHz RF ( radio frequency ) transceiver s.

1. Package Type:

The CC1120RHBR comes in the QFN-28 (Quad Flat No-leads) package type, with 28 pins in total.

2. Pin Function Specification for CC1120RHBR (QFN-28 Package):

The CC1120 has 28 pins, and each pin serves a specific function. Below is the detailed explanation of each pin function:

Pin Number Pin Name Pin Function Description 1 VCC Power supply input pin. It powers the internal circuits. Typically, this pin is connected to a regulated 1.8V to 3.6V voltage source. 2 GND Ground pin. Common ground reference for the entire IC. Connect to the system ground. 3 SDN Shutdown pin. This pin is used to put the device into a low power shutdown mode. Active low logic. 4 SCLK SPI clock pin. This pin is used for clocking the data in and out of the CC1120 device when communicating via SPI interface . 5 MISO Master-In Slave-Out pin. This pin is used for receiving data from the device in SPI communication. 6 MOSI Master-Out Slave-In pin. This pin is used for transmitting data to the device in SPI communication. 7 CSN Chip Select pin. This pin is used to enable or disable SPI communication. It should be low for data exchange. 8 GDO0 General Purpose I/O pin. Used for several functions like interrupt output, packet detection, and more. It can be configured for multiple purposes. 9 GDO2 General Purpose I/O pin. Similar to GDO0 but can serve additional functions such as data sync output, frame sync output, etc. 10 RX Receive pin. This pin is used to receive data from external RF signals. 11 TX Transmit pin. This pin is used to send data through the RF signal in a radio communication system. 12 ANT antenna pin. Connect to the antenna for RF signal transmission and reception. 13 V DDS Power supply input pin for the internal voltage regulator. Connect to a 1.8V to 3.6V supply. 14 RST Reset pin. This pin is used for a hardware reset of the device. Active low logic. 15 XTAL1 External crystal oscillator input. This pin is used for connecting an external crystal for precise clock generation. 16 XTAL2 External crystal oscillator output. This pin provides the output clock signal when an external crystal is used. 17 GDO3 General Purpose I/O pin. Configured for specific I/O functions, can be used for interrupt output, data output, etc. 18 PFI External RF signal input pin. Used to sample or monitor the received RF signals. 19 PFO External RF signal output pin. Provides an output for external monitoring of RF signals. 20 VDDIO Supply pin for I/O logic. Typically connected to the same supply as VCC or regulated separately for lower voltage (1.8V to 3.6V). 21 GND Ground pin. Connect to system ground. 22 GDO1 General Purpose I/O pin. Another I/O pin for various functions such as interrupt, sync, or frame sync signal output. 23 VREG Regulator output pin. Provides internal voltage regulation to the device. 24 SCLK SPI clock pin. Same as SCLK at pin 4, but used for different SPI configuration, serves as the clock for data transfer when this pin is configured in the SPI interface. 25 MISO SPI input pin (same as MISO at pin 5). Used for receiving data from the master device. 26 MOSI SPI output pin (same as MOSI at pin 6). Used for sending data to the master device. 27 VCC Power supply pin, connect to system power. 28 GND Ground pin, system ground.

3. FAQ (Frequently Asked Questions) About the CC1120RHBR:

Q1: What is the purpose of the "SDN" pin on the CC1120RHBR? A1: The "SDN" pin is used to shut down the device when logic low. It helps in reducing power consumption. Q2: How do I reset the CC1120RHBR device? A2: You can reset the CC1120RHBR by driving the "RST" pin low, then high, to perform a hardware reset. Q3: What is the voltage requirement for the "VCC" and "VDDS" pins? A3: Both the "VCC" and "VDDS" pins require a supply voltage between 1.8V and 3.6V. Q4: How do I interface the CC1120RHBR with a microcontroller? A4: The device communicates via SPI (Serial Peripheral Interface), so you need to connect the "SCLK", "MOSI", "MISO", and "CSN" pins to the microcontroller’s corresponding SPI pins. Q5: Can I use the "GDO" pins for interrupt purposes? A5: Yes, the "GDO" pins (such as GDO0, GDO1, GDO2, GDO3) are general-purpose pins and can be configured for interrupt signals based on the device's operation mode. Q6: What is the function of the "ANT" pin? A6: The "ANT" pin is used for the connection to the antenna for radio frequency transmission and reception. Q7: Can I power the CC1120RHBR from a 5V source? A7: No, the CC1120RHBR is designed for supply voltages between 1.8V and 3.6V, and exceeding this range may damage the device. Q8: What is the role of the "XTAL1" and "XTAL2" pins? A8: These pins are used to connect an external crystal oscillator for generating the clock signal required for RF operations. Q9: How do I select the data rate for transmission on CC1120RHBR? A9: The data rate is selected through the SPI configuration registers. Specific registers control the data rate based on modulation and other parameters. Q10: How does the "RX" and "TX" pin work? A10: The "RX" pin receives data from external RF signals, and the "TX" pin is used to transmit the data over the air. Q11: What is the function of the "PFI" and "PFO" pins? A11: The "PFI" pin is used for external signal input, and the "PFO" pin is used for output of the processed RF signal. Q12: Can the CC1120RHBR be used in low-power applications? A12: Yes, the CC1120RHBR has a shutdown mode (controlled by the "SDN" pin) that significantly reduces power consumption when not in use. Q13: How do I control the gain of the RF signal? A13: The gain is controlled through software by configuring specific registers that manage the radio's amplification levels. Q14: What is the maximum output power of CC1120RHBR? A14: The maximum output power of the CC1120RHBR varies depending on the frequency and configuration, typically up to +15 dBm. Q15: What are the modulation types supported by CC1120RHBR? A15: It supports various modulation types including FSK, GFSK, and OOK, among others. Q16: Can I use the CC1120RHBR for both transmit and receive operations simultaneously? A16: No, the CC1120RHBR is either in transmit mode or receive mode, but not both at the same time. Q17: How do I handle errors in communication between the CC1120RHBR and a microcontroller? A17: Errors in communication can be handled using the "GDO" pins to detect events like transmission completion or packet errors. Q18: What is the role of the "VDDIO" pin? A18: The "VDDIO" pin powers the I/O logic of the device. It typically connects to the same supply as "VCC" or a separate supply for lower voltage logic. Q19: Can the CC1120RHBR be used for both short-range and long-range communications? A19: Yes, the CC1120RHBR is versatile and can be configured for both short-range (e.g., Bluetooth-like applications) and long-range communication based on the modulation and power settings. Q20: How can I configure the CC1120RHBR for frequency hopping? A20: Frequency hopping can be configured through the registers of the CC1120RHBR, where you specify the frequency channels and hopping pattern.

I hope this answers all the technical details you're looking for!