Product Description

Raspberry pi Dual-channel Isolated RS232 Expansion Board


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.


  • 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.


  • 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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