Exar Corporation has introduced the XR28V382 and XR28V384 UARTs for the Intel Low Pin Count (LPC) motherboard bus. These new LPC UARTs have designed to reduce footprint while increasing data integrity and throughput by providing 128 byte FIFOs. These devices are targeted towards industrial PCs, factory automation, process controllers, network routers, and single board embedded computers.
The XR28V382 is packaged in a small 5x5mm 32 pin QFN and includes two UART channels, while the XR28V384 has four UART channels in a 7x7mm 48 pin TQFP. Exar’s dual and quad LPC UARTs, compared to 128 pin super I/O devices, offer the same or more serial channels in a significantly smaller footprint, offering as much as 8X reduction in board space.
“These new LPC UARTs are a great replacement or supplement for a super I/O device when the primary need is serial connectivity,” said Jack Roan, product marketing manager, Exar. “They are also an excellent alternative to USB UARTs; they interface directly with the system BIOS so there is no need to install a driver, and they are inherently compatible with multiple operating systems because the device is configured before the OS loads.”
Both the two channel XR28V382 and four channel XR28V384 UARTs include Exar’s automatic half duplex control for RS-485 networks. These parts feature 128 byte transmit and receive FIFOs, are rated for the industrial temp range, and operate at 3.3V. Each UART channel supports serial data rates up to 3Mbps.