2-Channel Isolated RS485 Expansion HAT for Raspberry Pi

Description
This 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.

Features
Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
Adopts SC16IS752+SP3485 dual-chip combination, converts SPI to RS485, data rate up to 921600bps
Allows transceiving data manually or automatically, configured by DIP switch
Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostatic
Onboard auto-recovery fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, improves shock resistance
Onboard LEDs for indicating the power and transceiver status
Breakout SPI control pins, for connecting with host control boards like Arduino
Comes with development resources and manual (examples in C and Python)
Specification
UART expansion chip: SC16IS752
RS485 transceiver: SP3485
Communication interface: SPI
Data rate: 300 ~ 921600 bps
Operating voltage: 3.3V / 5V
Dimensions: 65mm ¡Á 56.5mm
Mounting hole size: 3.0mm
Whats on Board
1.SC16IS752 UART expansion chip
2.ADUM1412 digital isolator
3.PC817 optocoupler
4.SP3485 RS485 transceiver
5.B0505LS power supply isolation module
6.RT9193-33 power chip
7.SMAJ12CA transient suppress diode array
8.Auto-recovery fuse
9.Status indicator
PWR: power indicator
RXD/TXD: UART transceiving indicator
10.Raspberry Pi GPIO connector: for connecting Raspberry Pi
11.RS485 terminal
12.MCU control header: for connecting host control boards like Arduino
13.120¦¸ terminal resistor switch
14.Interrupt pin switch
15.Operating mode selection
Half-auto: A=0, B=1
Full-auto: A=1, B=0
Example
Pinouts
PIN RASPBERRY PI (BCM) DESCRIPTION
VCC 5V 3.3V/5V power supply
GND GND Ground
SCK P21 (SPI1 SCLK) SPI clock input
MOSI P20 (SPI1 MOSI) SPI data input
MISO P19 (SPI1 MISO) SPI data output
CS P18 (SPI1 CS) SPI chip select
IRQ P24 Interrupt output
EN1 P27 Channel 1 TX/RX enable: high for TX, low for RX
EN2 P22 Channel 2 TX/RX enable: high for TX, low for RX
Dimension

Part List
2-CH RS485 HAT x1
2x20PIN female pinheader x1
RPi screws pack (2pcs) x1