Overview
The Texas Instruments TL28L92IFR is a Dual Universal Asynchronous Receiver/Transmitter (DUART) that operates as a single-chip CMOS-LSI communications device. It provides two full-duplex asynchronous receiver/transmitter channels, making it suitable for a variety of communication applications. The device supports both 3.3V and 5V power supplies and can operate over a temperature range of –40°C to 85°C. It is designed to interface directly with microprocessors and can be used in either polled or interrupt-driven systems, including those with modem and DMA interfaces.
Key Specifications
| Parameter | Description |
|---|---|
| Voltage - Supply | 3.3V, 5V |
| Number of Channels | 2 (DUART) |
| FIFOs | 16 Byte (each receiver and transmitter) |
| Data Rate (Max) | 1 Mbps |
| Package / Case | 44-QFP (10x10) |
| Mounting Type | Surface Mount |
| Bus Interface | 68xxx or 80xxx (pin programmable) |
| Baud Rate | 28 Fixed rates (50Bd to 230.4kBd), external 1× or 16× clock, programmable user-defined rates |
| Error Detection | Parity, framing, overrun, false start bit, line break detection and generation |
| Interrupt System | Single interrupt output with eight maskable interrupting conditions |
Key Features
- Dual full-duplex independent asynchronous receiver and transmitters with 16 character FIFOs for each.
- Programmable data format: 5 to 8 data bits plus parity (odd, even, no parity, or force parity), 1, 1.5, or 2 stop bits.
- Programmable baud rate for each receiver and transmitter: 28 fixed rates, external 1× or 16× clock, and programmable user-defined rates.
- Multi-function 7-bit input port and 8-bit output port with individual bit set and reset capability.
- Change of state detection on four inputs with typically > 100kΩ pullup resistors.
- False start bit detection, line break detection and generation, and watchdog timer for each receiver.
- On-chip crystal oscillator and power down mode.
- Versatile interrupt system with up to five separate interrupt outputs.
Applications
- Dual-speed channel applications such as clustered terminal systems.
- Communication systems requiring independent control of receiver and transmitter speeds.
- Modem and DMA interface applications.
- Embedded systems needing full-duplex asynchronous communication.
- Industrial control systems and automation.
Q & A
- What is the TL28L92IFR?
The TL28L92IFR is a Dual Universal Asynchronous Receiver/Transmitter (DUART) from Texas Instruments, providing two full-duplex asynchronous receiver/transmitter channels.
- What are the supported voltage supplies for the TL28L92IFR?
The device supports both 3.3V and 5V power supplies.
- What types of bus interfaces does the TL28L92IFR support?
The device supports both 68xxx and 80xxx bus interfaces, selectable via pin programming.
- What are the key features of the FIFOs in the TL28L92IFR?
Each receiver and transmitter has 16 character FIFOs to minimize the potential of receiver overrun and transmitter underrun.
- How can the baud rate be configured on the TL28L92IFR?
The baud rate can be configured from 28 fixed rates, external 1× or 16× clock, or programmable user-defined rates derived from a programmable counter and timer.
- What error detection capabilities does the TL28L92IFR have?
The device includes parity, framing, overrun, false start bit, and line break detection and generation.
- Can the TL28L92IFR be used in interrupt-driven systems?
- What is the maximum data transfer rate of the TL28L92IFR?
The maximum data transfer rate is 1 Mbps for both 1× and 16× clock configurations.
- Does the TL28L92IFR have any power-saving features?
- What package type is the TL28L92IFR available in?
The device is available in a 44-pin QFP (10x10) package.
