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Introduction
This user's manual is for the XR21B1424IV64-0A-EVB evaluation board. The XR21B1424IV64-F shares a common evalua-
tion board with the XR21B1422IL40-F. The main difference between the XR21B1424IV64-F and the XR21B1422IL40-F is
the number of UART channels. The XR21B1424IV64-F has 4 UART channels. The XR21B1422IL40-F has 2 UART chan-
nels. The only USB UART device installed on the XR21B1424IV64-0A-EVB evaluation board is the XR21B1424IV64-F.
Device Ordering Part Number
XR21B1424IV64-F
XR21B1422IL40-F
Evaluation Board Overview
A block diagram of the evaluation board is shown in
USB
Connector
In addition to the XR21B1424IV64-F, there are Exar SP339 Multiprotocol transceivers on this evaluation board. The SP339
can be configured for Loopback, RS-232, Half-Duplex RS-485 or Full-Duplex RS-485/422 Modes. The default setting when
shipped from the factory is RS-232 mode.
Figure 2
on the next page show the top view and bottom view of the evaluation board with all of the components, connectors
and headers labeled. A higher resolution PDF file for the top and bottom views are also included on the CD that is shipped
with the evaluation board.
© 2014 Exar Corporation
Table 1: Evaluation Board Ordering Part Numbers
Evaluation Board Ordering Part
XR21B1424IV64-0A-EVB
XR21B1422IL40-0A-EVB
Figure 1
XR21B1424
Figure 1: Evaluation Board Block Diagram
XR21B1424IV64-0A-EVB
Evaluation Board User's Manual
Device Package
Number
below.
SP338
SP339
SP338
SP339
SP338
SP339
SP338
SP339
1 / 6
Device
Location
64-pin LQFP
U7
40-pin QFN
U6
DB9
Connector
DB9
Connector
DB9
Connector
DB9
Connector
exar.com/XR21B1421
Rev 1A
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Table of Contents
Related Manuals for Exar XR21B1424IV64-0A-EVB
Summary of Contents for Exar XR21B1424IV64-0A-EVB
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Page 1: Evaluation Board Overview
Connector Figure 1: Evaluation Board Block Diagram In addition to the XR21B1424IV64-F, there are Exar SP339 Multiprotocol transceivers on this evaluation board. The SP339 can be configured for Loopback, RS-232, Half-Duplex RS-485 or Full-Duplex RS-485/422 Modes. The default setting when shipped from the factory is RS-232 mode. - Page 2 XR21B1424IV64-0A-EVB Figure 2: Top View of Evaluation Board 2 / 6 exar.com/XR21B1424 © 2014 Exar Corporation Rev 1A...
- Page 3 ENABLE pin disables the SP339. J20 - 7 &8 USB_STAT2 enables/disables the SP339 transceiver for channel D.When this jumper is removed, the internal pull-down resistor for the ENABLE pin disables the SP339. 3 / 6 exar.com/XR21B1424 © 2014 Exar Corporation Rev 1A...
- Page 4 Not installed. GPIOC8/TXTC is not connected to the MODE1 pin of the SP339. J20 - 3 & 4 Not installed. GPIOD8/TXTD is not connected to the MODE1 pin of the SP339. 4 / 6 exar.com/XR21B1424 © 2014 Exar Corporation Rev 1A...
- Page 5 Automatic Transceiver Enable feature for the GPIO7/RS485 or GPIO5/RTS#/RS485 pins. Software and Technical Support Software drivers and test applications should be included in the CD that accompanies the evaluation board. Send any ques- tions that you may have to UARTtechsupport@exar.com. 5 / 6 exar.com/XR21B1424 © 2014 Exar Corporation...
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Page 6: Revision History
Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Cor- poration is adequately protected under the circumstances.
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