translation missing: en.general.accessibility.skip_to_content

2-Channel Isolated RS485 Expansion HAT for Raspberry Pi

by Seeed
SKU 3503
Sold out
£24.58 inc VAT
£20.48 ex VAT

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.

  • 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 × 56.5mm
  • Mounting hole size: 3.0mm

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