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Raspberry Pi 2-Channel Isolated RS485 Expansion HAT

$17.89

Part Number:2-CH RS485 HAT
Brand:Spotpear
SKU:0102003

Date:2020/07/07 17:44

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 SPI interface. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for fields like industrial automation.

Do not include Raspberry Pi


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)


Specifications


  • 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


What's 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. 120Ω 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

PINRASPBERRY PI (BCM)DESCRIPTION
VCC5V3.3V/5V power supply
GNDGNDGround
SCKP21 (SPI1 SCLK)SPI clock input
MOSIP20 (SPI1 MOSI)SPI data input
MISOP19 (SPI1 MISO)SPI data output
CSP18 (SPI1 CS)SPI chip select
IRQP24Interrupt output
EN1P27Channel 1 TX/RX enable: high for TX, low for RX
EN2P22Channel 2 TX/RX enable: high for TX, low for RX


Dimension