SC16IS752

Arduino library for the NXP SC16IS752 dual UART bridge (I2C/SPI).

Microcontrollers typically offer only a limited number of UART interfaces. When you need to connect multiple serial devices and software-based serial communication is too slow or unreliable, you can use SC16IS752 modules to expand your system. Each module provides two additional hardware serial ports, enabling efficient communication with multiple devices.

Features

• Dual UART channels (A/B)
• I2C or SPI transport
• Per-channel Stream adapters (channelA() / channelB())
• RS485 helpers
• Interrupt helpers
• Optional logger (SC16IS752Logger)

Install

For Arduino, you can download the library as zip and call include Library -> zip library. Or you can git clone this project into the Arduino libraries folder e.g. with

cd  ~/Documents/Arduino/libraries
git clone https://github.com/pschatzmann/SC16IS752.git

Wiring Notes

I2C mode

• Provide Wire in the constructor.
• Connect:
  • VCC -> 5V (or board-compatible supply)
  • GND -> GND
  • SCL -> MCU SCL
  • SDA -> MCU SDA

I2C address selection

Typical address mapping from A0/A1 strap:

• A0=HIGH, A1=HIGH -> 0x48
• A0=HIGH, A1=LOW -> 0x49
• A0=LOW, A1=HIGH -> 0x4C
• A0=LOW, A1=LOW -> 0x4D

Note: SC16IS750_ADDRESS_* constants are 7-bit I2C addresses and are used directly with Wire.

SPI mode

• Provide SPI and the cs pin in the constructor.
• Connect:
  • VCC -> 5V (or board-compatible supply)
  • GND -> GND
  • A0/CS -> MCU CS
  • A1/SI -> MCU MOSI
  • NC/SO -> MCU MISO
  • SCL/SCLK -> MCU SCK

Voltage level note

Many breakout boards provide onboard 3.3V regulation for the SC16IS752 core and are commonly used with 5V-tolerant interfaces, but always verify your exact board schematic before wiring.

Documentation

• examples
• Class Documentation