XR21B1411IL-0A-EB Exar Corporation, XR21B1411IL-0A-EB Datasheet - Page 10

• 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 default Manufacturer String is "Exar" and Product String is "XR21B1411" if no string values have been
entered. There is no default value for the Serial Number String. If one string is entered, then all three strings
need to be updated or they will not have a value when the OTP is programmed. Entering a value for the Serial
Number String is optional.
By default, remote wake-up support is enabled. This can be disabled by unchecking the box. Note that if the
software driver does not have the remote wake-up feature enabled, then the XR21B1411 will not issue a
remote wake-up signal when a remote wake-up event occurs. Note that the standard CDC-ACM driver does
not support the Remote Wake-up feature.
By default, bus-powered mode is enabled. The XR21B1411 can be configured for self-powered mode by
checking the box next to "Self Powered". For self-power mode, it is recommended that the box next to "Enable
VBUS Sense" also be checked. The VBUS Sense feature disables the internal pull-up resistor on the USBD+
pin when there is no power on the VBUS pin. This is required for USB compliance. If the VBUS Sense feature
is not available, then an external mechanism is required to disable the power supply to the XR21B1411.
By default, the USB maximum power is configured as 100 mA. This is the maximum for a low power device, as
described in the USB specifications. Any board that requires more than 100 mA from VBUS will be considered
a high power device. The maximum allowable supply current is 500 mA for a high power device. The USB
max power can be changed by clicking on the arrows on either end of the scroll bar or by dragging the
horizontal scroll bar.
The default polarity of the LOWPOWER pin (pin 1) is active high as shown in the drawing. The polarity can be
changed by clicking on the box below the USB block in the drawing. The inner circle will become yellow to
indicate that the LOWPOWER pin is now active low.
3.2
3.3
3.4
3.5
3.6
USB Manufacturer, Product, Serial Number Strings
Remote Wake-up Support
Selecting the Power Mode
USB Max Power
LOWPOWER Pin Polarity
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REV. 1.0.0