The MAX3100CEE 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 MAX3100CEE 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 MAX3100CEE 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 MAX3100CEE 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 MAX3100CEE is available in 14-pin plastic DIP and small, 16-pin QSOP packages in the commercial and extended temperature ranges.
Feature
- 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
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
