Operating Frequency Range: 433.4—473.0MHz Transmit Power Max: 20dBm Power Supply Voltage: DC 3.2V ~5.5V Long Communication Dist
• Wireless sensor
• Community building security
• Robot wireless control
• Industrial remote control and telemetry
• Automatic data acquisition
• Container information management
• POS system
• Wireless acquisition of gas meter data
• Vehicle keyless entry system
• PC wireless networking
Long-distance wireless transmission (FU3: 1000m in open space, baud rate 5000bps in the air. FU4: 1800m in open space, baud rate 500bps in the air) • Working frequency range (433.4-473.0MHz, with 100 communication channels) • Maximum 100mW (20dBm) transmitting power (8 levels of power can be set) • Four working modes, adapted to different application situations • Built-in MCU performs communication with external device through serial port, no programming or configuration required for basic use • The number of bytes transmitted continuously is unlimited (FU1 and FU3 modes only) • Update software version through the serial port Product Introduction The HC-12 wireless serial port communication module is a new generation of multi-channel embedded wireless data transmission module. Its wireless working frequency band is 433.4-473.0MHz. Multiple channels can be set, with a channel stepping of 400kHz and a total of 100 channels. The maximum transmitting power of the module is 100mW (20dBm), the receiving sensitivity is -117dBm at a baud rate of 5000bps in the air. Communication distance is 1000m (FU3 mode at 4800bps serial speed) in open space, 1800m in FU4 mode at reduced baud rate and volume of data. The module uses stamp hole packaging to allow for patch soldering, with dimensions of 27.8mm ×14.4mm ×4mm (including antenna cap, excluding spring antenna), making it is very convenient for incorporate into user specific applications. There is a PCB antenna socket ANT1 on the module, so an external 433MHz frequency band antenna can be attached via a coaxial cable; there is also an antenna solder eyelet ANT2 on the module, convenient to solder a spring antenna to. Select one of these antenna options according to usage requirements. The module has an onboard MCU, eliminating the need for user to program the radio section separately, with transparent half-duplex serial transmission provided for receiving and sending serial port data. This making the HC-12 very easy to interface with. The module adopts multiple serial port transparent transmission modes that are user selected by AT commands according to usage requirements. The average working current of the four modes FU1, FU2, FU3, and FU4 in idle state are: 3.6mA, 80uA, 16mA, and 16mA respectively, while the maximum working current in any mode is 100mA (in the transmitting state).
Standard configuration of the HC-12 module only contains one 433MHz-frequencyband wireless communication module with IPEX20279-001E-03 standard RF socket. Optional accessories are 433MHz frequency band spring antenna, or IPEX-to-BNC coaxial cable and matching 433MHz frequency band omni-directional rubber antenna with BNC connector base. The user can purchase these according to their application requirements.
The HC-12 module uses a Silicon Labs Si4463 to provide the RF communications link. This is a high performance, low current, single-chip “EZRadioPRO” family transceiver with up to 20dBm (100mW) transmitting output power. The Si4463 communicates through an SPI bus with an STMicroelectronics STM8S003F3 8-bit MCU that runs the HC-12 firmware. The STM8S provides a transparent serial data interface for interfacing to the module, allowing two HC-12 modules to act like a wired TTL level serial cable without any attached hardware devices needing to be aware of the RF link. Serial port and transceiver configurations are held in onboard non-volatile flash memory
Definition of Pins
The HC-12 module can be patch soldered, or have a 2.54mm-spacing pin header attached and directly inserted onto the user’s PCB. The module has nine pins in total, and one RF antenna socket (ANT1), with definitions as shown in the table below: Pin Definition I/O direction Notes 1. Vcc Power supply input, DC3.2V-5.5V, with load capacity not less than 200mA. Note: if the module is working in the transmitting state for an extended time, it is suggested that a 1N4007 diode be connected in series if the supply voltage is greater than 4.5V, so as to avoid overheating the onboard LDO regulator 2. GND Common ground 3. RxD Input (weak pullup) UART data input, TTL level. 1k resistor connected in series inside the module 4. TxD Output UART data output, TTL level. 1k resistor connected in series inside the module 5 SET Input (10k pullup) Parameter setting control pin, active low level. 1k resistor connected in series inside the module 6. ANT Input/Output 433MHz antenna pin 7. GND Common ground 8. GND Common ground 9. NC No connection, used in mechanical fixing, compatible with HC-11 module pin position ANT1 ANT Input/Output IPEX20279-001E-03 antenna socket ANT2 ANT Input/Output 433MHz spring antenna solder eyelet Pins 1-6 each have two bonding pads, with the outer half-hole bonding pads intended for patch soldering. When the inner bonding pad ANT2 of Pin 6 is used for connection, the spring antenna can be soldered here by hand. The inner round-hole bonding pads of Pins 1-5 may then be used to solder a 2.54mm-spacing pin header that can be plugged into a PCB socket.