2-Channel Isolated RS485 Expansion HAT for Raspberry Pi
DescriptionThis is a 2-channel isolated RS485 expansion HAT designed for Raspberry Pi, adopts the SC16IS752+SP3485 solution, with embedded protection circuits such as power supply isolation, ADI magnetical isolation, and TVS diode, etc.It is easy to control the 2-channel RS485 for auto transceiving via the SPI interface. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for fields like industrial automation.FeaturesStandard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boardsAdopts SC16IS752+SP3485 dual-chip combination, converts SPI to RS485, data rate up to 921600bpsAllows transceiving data manually or automatically, configured by DIP switchOnboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostaticOnboard auto-recovery fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, improves shock resistanceOnboard LEDs for indicating the power and transceiver statusBreakout SPI control pins, for connecting with host control boards like ArduinoComes with development resources and manual (examples in C and Python)SpecificationUART expansion chip: SC16IS752RS485 transceiver: SP3485Communication interface: SPIData rate: 300 ~ 921600 bpsOperating voltage: 3.3V / 5VDimensions: 65mm ¡Á 56.5mmMounting hole size: 3.0mmWhats on Board1.SC16IS752 UART expansion chip2.ADUM1412 digital isolator3.PC817 optocoupler4.SP3485 RS485 transceiver5.B0505LS power supply isolation module6.RT9193-33 power chip7.SMAJ12CA transient suppress diode array8.Auto-recovery fuse9.Status indicatorPWR: power indicatorRXD/TXD: UART transceiving indicator10.Raspberry Pi GPIO connector: for connecting Raspberry Pi11.RS485 terminal12.MCU control header: for connecting host control boards like Arduino13.120¦¸ terminal resistor switch14.Interrupt pin switch15.Operating mode selectionHalf-auto: A=0, B=1Full-auto: A=1, B=0ExamplePinoutsPIN RASPBERRY PI (BCM) DESCRIPTIONVCC 5V 3.3V/5V power supplyGND GND GroundSCK P21 (SPI1 SCLK) SPI clock inputMOSI P20 (SPI1 MOSI) SPI data inputMISO P19 (SPI1 MISO) SPI data outputCS P18 (SPI1 CS) SPI chip selectIRQ P24 Interrupt outputEN1 P27 Channel 1 TX/RX enable: high for TX, low for RXEN2 P22 Channel 2 TX/RX enable: high for TX, low for RXDimensionPart List2-CH RS485 HAT x12x20PIN female pinheader x1RPi screws pack (2pcs) x1