NXP SC28L92A1A: A Comprehensive Technical Overview of the Dual UART with 16-Byte FIFOs
The NXP SC28L92A1A stands as a robust and highly integrated solution for asynchronous data communications, representing a significant evolution in UART (Universal Asynchronous Receiver/Transmitter) technology. This device integrates two independent UART channels into a single package, making it an ideal choice for applications requiring reliable serial communication with reduced processor overhead, such as in industrial control, networking, point-of-sale systems, and embedded computing.
A cornerstone feature of the SC28L92A1A is its deep 16-byte FIFO (First-In, First-Out) buffer on both the receive and transmit paths for each UART channel. This architecture is critical for enhancing system performance. By buffering data, the FIFOs significantly reduce the number of interrupts the host processor must service, freeing up valuable CPU resources for other tasks and preventing data overrun errors in high-speed or interrupt-latency environments.
The operational flexibility of this dual UART is extensive. It supports programmable data rates up to 1 Mbit/s, allowing it to adapt to a wide range of communication standards and baud rates. Data format is highly configurable, with options for 5, 6, 7, or 8 data bits; 1, 1.5, or 2 stop bits; and even parity, odd parity, or no parity generation and checking.
Beyond standard UART functionality, the SC28L92A1A is equipped with a versatile set of multi-protocol capabilities. Each channel can be individually configured to operate in different modes, including standard UART, automatic echo, local loopback, and remote loopback modes, which are invaluable for system diagnostics and testing. Furthermore, it includes support for infrared (IrDA) serial communication protocols, extending its utility to wireless data transfer applications.
The interface to the host microcontroller or processor is designed for simplicity and efficiency. It features an 8-bit multiplexed or non-multiplexed parallel bus compatible with various microprocessor architectures. This bus is used for configuration, status monitoring, and data transfer. The device also incorporates a programmable interrupt system that can be tailored to generate interrupts based on specific conditions, such as receiver ready, transmitter empty, or line status changes, providing efficient event-driven control.
For managing modem or peripheral handshaking, each UART channel includes a complete set of modem control signals (CTS, RTS, DSR, DTR, RI, DCD). These signals ensure reliable flow control and communication synchronization with external devices.
Packaged in a space-efficient 44-pin PLCC or LQFP format, the SC28L92A1A is engineered for low-power operation, making it suitable for power-sensitive applications without compromising on performance or feature set.
ICGOO
DFIND Summary: The NXP SC28L92A1A is a high-performance, feature-rich dual UART that excels in offloading serial communication tasks from the main host processor. Its deep FIFOs, high-speed capability, and multi-protocol support make it a versatile and reliable cornerstone for complex embedded systems requiring robust serial data links.
Keywords: Dual UART, 16-Byte FIFO, Programmable Data Rate, Multi-Protocol Capabilities, Modem Control Signals.
