max310019-1259; Rev 0; 7/97 SPI/Microwire-Compatible UART in QSOP-16 _______________General Description 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 (C), the MAX3100 comes in a compact 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 baudrate 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 10A, w……