NXP SC16IS762IBS: A Dual UART with I²C/SPI Interface Bridge for Embedded Systems

In the realm of embedded systems design, managing multiple serial devices or expanding UART capabilities beyond the limited ports of a host microcontroller is a common challenge. The NXP SC16IS762IBS addresses this need as a highly integrated, dual-channel UART that serves as a crucial bridge between a microcontroller's high-speed I²C or SPI bus and standard asynchronous serial interfaces. This device effectively offloads the UART processing burden from the main CPU, enhancing overall system performance and flexibility.

The core functionality of the SC16IS762IBS lies in its ability to provide two full-featured, independent UART channels. Each channel supports data rates up to 5 Mbps and includes a 64-byte FIFO for both transmit and receive paths. These FIFOs are critical for reducing the frequency of interrupts to the host processor, allowing it to handle larger blocks of data more efficiently and preventing data overrun in high-throughput applications such as industrial control, networking equipment, or point-of-sale terminals.

A key advantage of this IC is its dual-interface flexibility. The host microcontroller can communicate with the SC16IS762IBS using either the ubiquitous I²C-bus (up to 400 kHz in Fast-mode) or the higher-speed SPI interface (up to 15 MHz). This allows designers to choose the bus that best fits their application's speed requirements and available MCU pins, simplifying integration into both new and existing designs.

Beyond basic UART conversion, the device is packed with features that minimize external component count and board space. It includes software and hardware flow control (RTS/CTS and Xon/Xoff), which is essential for managing data streams with peripherals of different speeds. Furthermore, it offers programmable GPIO pins that can be configured for various control functions, adding further utility to the compact package.

The SC16IS762IBS operates from a single 2.5V to 3.6V supply and is available in a space-efficient HVQFN32 package, making it an excellent choice for power-sensitive and space-constrained applications. Its industrial temperature range ensures reliability across demanding environments.

ICGOODFIND: The NXP SC16IS762IBS is an indispensable bridge IC for system architects, offering a powerful combination of dual UART expansion, high-speed interface flexibility, and deep FIFO buffering to optimize data communication and free up valuable host processor resources in sophisticated embedded systems.

Keywords: UART Bridge, I²C/SPI Interface, FIFO Buffering, Embedded Systems, Serial Communication.