The MAX3100 universal asynchronous receiver transmitter (UART) is the first UART specifically optimized for small microcontroller-based systems. Using an SPI™/MICROWIRE™ interface for communication with the host microcontroller (µC), the MAX3100 comes in a compact 24-pin-TQFN and 16-pin QSOP. The asynchronous I/O is suitable for use in RS-232, RS-485, IR, and opto-isolated data links. IR-link communication is easy with the MAX3100's infrared data association (IrDA) timing mode. The MAX3100 includes a crystal oscillator and a baud-rate generator with software-programmable divider ratios for all common baud rates from 300 baud to 230k baud. A software- or hardware-invoked shutdown lowers quiescent current to 10µA, while allowing the MAX3100 to detect receiver activity. An 8-word-deep first-in/first-out (FIFO) buffer minimizes processor overhead. This device also includes a flexible interrupt with four maskable sources, including address recognition on 9-bit networks. Two hardware-handshaking control lines are included (one input and one output). The MAX3100 is available in 14-pin plastic DIP and small, 16-pin QSOP packages in the commercial and extended temperature ranges. Applications * Handheld Instruments (PDAs, Palmtops) * Intelligent Instruments * Isolated RS-232/RS-485: Directly Drives Optocouplers * Low-Cost IR Data Links for Computers/Peripherals * Small Networks in HVAC or Building Control * UART in SPI Systems * Small TQFN and QSOP Packages Available * Full-Featured UART: * IrDA SIR Timing Compatible * 8-Word FIFO Minimizes Processor Overhead at High Data Rates * Up to 230k Baud with a 3.6864MHz Crystal * 9-Bit Address-Recognition Interrupt * Receive Activity Interrupt in Shutdown * SPI/MICROWIRE-Compatible µC Interface * Lowest Power: * 150µA Operating Current at 3.3V * 10µA in Shutdown with Receive Interrupt * +2.7V to +5.5V Supply Voltage in Operating Mode * Schmitt-Trigger Inputs for Opto-Couplers * TX and RTS Outputs Sink 25mA for Opto-Couplers https://elecena.pl/product/22322998/spi-microwire-compatible-uart-in-qsop-16 2022-12-27 https://elecena.pl/product/22322998/spi-microwire-compatible-uart-in-qsop-16 2025-01-20