XR21B1411IL-0A-EB Exar Corporation, XR21B1411IL-0A-EB Datasheet - Page 8

• Manufacturer Part Number: XR21B1411IL-0A-EB
• Description: EVAL BOARD UART SR21B1411
• Manufacturer: Exar Corporation

Specifications of XR21B1411IL-0A-EB

• Mfg Application Notes: Board Design Considerations AppNote
• Design Resources: XR21B1411 SP337 Eval Brd Schematic
• Interface Type: RS-232, RS-422, RS-485, USB, UART
• Operating Supply Voltage: 5 V
• Product: Interface Modules
• Silicon Core Number: XR21B1411
• Application Sub Type: UART
• Kit Contents: Board
• Silicon Manufacturer: Exar
• Kit Application Type: Communication & Networking
• For Use With/related Products: XR21B1411
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 1016-1380

XR21B1411 USER’S MANUAL
WEB CONFIGURATION TOOL USER’S MANUAL
The Auto Half-Duplex Transceiver enable mode is typically used in half-duplex RS-485 applications. In this
mode the GPIO5/RTS# pin is used to control the driver enable of an RS-485 transceiver. When this mode is
selected, the polarity will also need to be selected as active high or active low.
An example of how the Auto Half-Duplex Transceiver enable mode is shown below. The block next to the "TX
EN" also shows whether the selected polarity is active high or active low.
In this mode, GPIO4-GPIO0 can still be configured as described in
in GPIO Mode” on page
2.4
■
■
Active High - The GPIO5/RTS# pin will be low when the UART is not transmitting data and the GPIO5/
RTS# pin will be high when the UART is transmitting data.
Active Low - The GPIO5/RTS# pin will be high when the UART is not transmitting data and the GPIO5/
RTS# pin will be low when the UART is transmitting data.
Configuring the GPIO Pins in Auto Half-Duplex Transceiver Enable Mode
1.
8
“Section 2.1, Configuring the GPIO pins
REV. 1.0.0