Product Description

Raspberry pi Dual-channel Isolated RS232 Expansion Board

Introduction:

The dual-channel isolated RS232 expansion board specially designed for Raspberry Pi adopts SC16IS752+SP3232 scheme, with built-in protection circuits such as power isolation, ADI magnetic coupling isolation and TVS.

My operation is simple, and I can control two RS232 communications through the SPI interface. It has the characteristics of fast, stable, reliable and safe communication, and can be applied to industrial automation and other fields.

Features:

  • Based on Raspberry Pi 40pin GPIO interface, it is suitable for Raspberry Pi series motherboards.
  • With SC16IS752 and SP3232 dual-chip combination scheme, SPI to RS232 can be realized, and the communication rate is as high as 921600bps.
  • On-board TVS (transient voltage suppression tube) can effectively suppress surge voltage and transient peak voltage in the circuit, and prevent lightning and static electricity.
  • On-board power supply and serial port transceiver indicator light facilitate viewing module power supply and communication status.
  • SPI control interface is led out to facilitate access to Arduino and other main control boards.

Parameters:

  • Serial port expansion chip: SC16IS752
  • RS232 transceiver: SP3232
  • Communication: SPI
  • Communication rate: 300 ~ 921600 bps
  • Operating voltage: 3.3V/5V
  • Product size: 65mm × 56.5mm
  • Diameter of via hole: 3.0mm

1. SC16IS752 extended serial port chip

2. SP3232 RS232 transceiver

3. ADUM1412 digital isolator chip

4. B0505LS power isolation module

5. RT9193-33 power chip

[Introduction to Interface]

6. Raspberry Pi GPIO interface

Convenient access to Raspberry Pi

7.MCU control interface

Convenient access to Arduino and other main control boards.

8.RS232 bus interface

Two RS232 interfaces (RS239 pin male)

[Introduction of other devices]

9. Transient suppression diode array

10. Electrostatic protection bidirectional diode

11. Serial port status indicator

Rx/RXD1/TXD1:Channel 1 serial port transceiver indicator

Rxd2/TXD2: Channel 2 serial port transceiver indicator

12. Power status indicator

[solder joint description]

13. Interrupt pin switching

Connect the interrupt pin IRQ through P5 (BCM P24) by default,

It can be modified to other pins by 0R resistor.

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