XR21B1422IL40-0A-EVB

XR21B1424IV64-0A-EVB Evaluation Board User’s Manual Introduction This user’s manual is for the XR21B1424IV64-0A-EVB evaluation board. The XR21B1424IV64-F shares a common evaluation 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 channels. The only USB UART device installed on the XR21B1424IV64-0A-EVB evaluation board is the XR21B1424IV64-F. Table 1: Evaluation Board Ordering Part Numbers Device Ordering Part Number Evaluation Board Ordering Part Number Device Package Device Location XR21B1424IV64-F XR21B1424IV64-0A-EVB 64-pin LQFP U7 XR21B1422IL40-F XR21B1422IL40-0A-EVB 40-pin QFN U6 Evaluation Board Overview A block diagram of the evaluation board is shown in Figure 1 below. USB Connector SP338 SP339 DB9 Connector SP338 SP339 DB9 Connector SP338 SP339 DB9 Connector SP338 SP339 DB9 Connector XR21B1424 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. 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. © 2020 MaxLinear, Inc. 1/6 maxlinear.com/XR21B1424 Rev 1B XR21B1424IV64-0A-EVB Figure 2: Top View of Evaluation Board © 2020 MaxLinear, Inc. 2/6 maxlinear.com/XR21B1424 Rev 1B XR21B1424IV64-0A-EVB Hardware Configurations This sections describes the default settings when shipped from the factory and the requirements for changing modes. XR21B1424 Power Configurations When shipped from the factory, the XR21B1424 is configured for bus-powered mode and uses the 5V from the USB VBUS pin. The default jumper settings are shown in Table 2. Table 2: Default Jumper Settings Jumper Setting Description J27 - 1 & 2 Connects 5V from VBUS to VCC_REG (pin 13). A regulated 3.3V output will be available on the VCC pin (pin 12). J35 - 1 & 2 Connects regulated 3.3V from VCC pin to VIO. The output voltage of the UART/GPIO pins will be 3.3V. If not using the 5V from VBUS, an external 3.3V can be supplied to VCC_REG via J27 pin 2. GPIO Configurations GPIOA0/RIA#/RWKA# When shipped from the factory, the GPIOA0/RIA#/RWKA# pin is connected to the push-button switch (SW1). SW1 can be used to test the remote wake-up functionality. The default jumper settings are shown in Table 3. Table 3: Default Jumper Setting for GPIOA0/RIA#/RWKA# Jumper Setting J25 - 2 & 3 Description GPIO0/RI#/RWK# connected to SW1. Can be used for remote wake-up. Changing the header to J25 1&2 will connect the GPIOA0/RIA#/RWKA# pin to the SP338/SP339 transceiver. GPIO0-GPIO5 Besides GPIO0 of channel A, GPIO0-GPIO5 of all UART channels are connected directly to the SP339 transceiver. There are headers installed for easy access to these signals. If testing with these pins without the SP339 transceiver, the SP339 should be disabled by removing the jumpers listed in Table 4. Table 4: Default setting for SP339 Transceiver © 2020 MaxLinear, Inc. Jumper Setting Description J5 - 7 &8 USB_STAT2 enables/disables the SP339 transceiver for channel A. When this jumper is removed, the internal pull-down resistor for the ENABLE pin disables the SP339. J10 - 7 &8 USB_STAT2 enables/disables the SP339 transceiver for channel B.When this jumper is removed, the internal pull-down resistor for the ENABLE pin disables the SP339. J11 - 7 &8 USB_STAT2 enables/disables the SP339 transceiver for channel C.When this jumper is removed, the internal pull-down resistor for the 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 maxlinear.com/XR21B1424 Rev 1B XR21B1424IV64-0A-EVB GPIO6/CLK When shipped from the factory, the GPIO6/CLK pin is floating. If using this pin as a CLK function, the signal can be captured via the J31 header. If using this pin to control the MODE0 pin of the SP339, install jumpers for the appropriate channels listed in Table 5. The software driver/application will need to control the state of this pin. Table 5: Default Jumper Setting for GPIO6/CLK Jumper Setting Description J5 - 1& 2 Not installed. GPIOA6/CLKA is not connected to the MODE0 pin of the SP339. J10 - 1& 2 Not installed. GPIOB6/CLKB is not connected to the MODE0 pin of the SP339. J11 - 1& 2 Not installed. GPIOC6/CLKC is not connected to the MODE0 pin of the SP339. J20 - 1& 2 Not installed. GPIOD6/CLKD is not connected to the MODE0 pin of the SP339. GPIO7/RS485 When shipped from the factory, the GPIO7/RS485 pin is floating. This pin can be used to control the DIR1 pin of the SP339 when the SP339 is configured for half-duplex RS-485 mode. If using this pin to control the DIR1 pin of the SP339, install jumpers for the appropriate channels listed in Table 6. The software driver/application will need to enable the half-duplex direction control feature for this pin. Table 6: Default Jumper Setting for GPIO7/RS485 Jumper Setting Description J3 - 1& 2 Not installed. GPIOA7/RS485A is not connected to the DIR1 pin of the SP339. J10 - 1& 2 Not installed. GPIOB7/RS485B is not connected to the DIR1 pin of the SP339. J11 - 1& 2 Not installed. GPIOC7/RS485C is not connected to the DIR1 pin of the SP339. J20 - 1& 2 Not installed. GPIOD7/RS485D is not connected to the DIR1 pin of the SP339. GPIO8/TXT When shipped from the factory, the GPIO8/TXT pin is floating. This pin can be used to control the MODE1 pin of the SP339. If using this pin to control the MODE1 pin of the SP339, install jumpers for the appropriate channels listed in Table 7. The software driver/application will need to control the state of this pin. Table 7: Default Jumper Setting for GPIO8/TXT Jumper Setting © 2020 MaxLinear, Inc. Description J5 - 3 & 4 Not installed. GPIOA8/TXTA is not connected to the MODE1 pin of the SP339. J10 - 3 & 4 Not installed. GPIOB8/TXTB is not connected to the MODE1 pin of the SP339. J11 - 3 & 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 maxlinear.com/XR21B1424 Rev 1B XR21B1424IV64-0A-EVB GPIO9/RXT When shipped from the factory, the GPIO9/RXT pin is floating. This pin can be used to control the MODE2 pin of the SP339. If using this pin to control the MODE2 pin of the SP339, install jumpers for the appropriate channels listed in Table 8. The software driver/application will need to control the state of this pin. Table 8: Default Jumper Setting for GPIO9/RXT Jumper Setting Description J5 - 5 & 6 Not installed. GPIOA9/RXTA is not connected to the MODE2 pin of the SP339. J10 - 5 & 6 Not installed. GPIOB9/RXTB is not connected to the MODE2 pin of the SP339. J11 - 5 & 6 Not installed. GPIOC9/RXTC is not connected to the MODE2 pin of the SP339. J20 - 5 & 6 Not installed. GPIOD9/RXTD is not connected to the MODE2 pin of the SP339. SP338/SP339 Mode Selection When shipped from the factory, the SP338/SP339 transceivers are configured in the RS-232 mode. Table 9 shows the RS232 settings for the SP339. Table 9: SP339 RS-232 Mode Pin Configurations Mode Configuration MODE0 1 MODE1 0 MODE2 0 There are 2 sets of headers for each UART channel for configuring the mode of the SP339 transceiver. For example, channel A uses J5 and J4. For the RS-232 mode, there is a jumper from J5 pin 2 to J4 pin 1. Refer to the table in the schematic or the SP339 datasheet for the different configurations. By default, the ENABLE of the SP339 transceiver is controlled by the USB_STAT2 pin of the XR21B1424. Half-duplex, Full-Duplex and Mixed Duplex RS-485/422 modes In the RS-485 half-duplex, full-duplex and mixed duplex modes, the DIR1 pin of the SP338/SP339 enables or disables the RS-485/422 line drivers. The DIR1 pin can be controlled by the XR21B1424 using the GPIO7/RS485 or GPIO5/RTS#/ RS485 output pins. The GPIO7/RS485 or GPIO5/RTS#/RS485 pin can be selected via J21. Refer to the datasheet for details for selecting and enabling the Automatic Transceiver Enable feature for the GPIO7/RS485 or GPIO5/RTS#/RS485 pins. Software and Technical Support Visit www.maxliner.com/XR21B1422 or www.maxlinear.com/XR21B1424 to download documentation and design tools including software, software drivers, evaluation board schematics, and evaluation board design files. Visit www.maxlinear.com/support/contact-us to search for regional contacts, knowledge-base articles, and submit new support requests. © 2020 MaxLinear, Inc. 5/6 maxlinear.com/XR21B1424 Rev 1B XR21B1424IV64-0A-EVB Revision History Revision Date Description 1A April 2014 1B January 2020 Initial release. Add MaxLinear logo and edit "Software and Technical Support" section. Corporate Headquarters: 5966 La Place Court Suite 100 Carlsbad, CA 92008 Tel.:+1 (760) 692-0711 Fax: +1 (760) 444-8598 www.maxlinear.com The content of this document is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by MaxLinear, Inc. MaxLinear, Inc. assumes no responsibility or liability for any errors or inaccuracies that may appear in the informational content contained in this guide. Complying with all applicable copyright laws is the responsibility of the user. Without limiting the rights under copyright, no part of this document may be reproduced into, stored in, or introduced into a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), or for any purpose, without the express written permission of MaxLinear, Inc. Maxlinear, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless MaxLinear, Inc. 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 MaxLinear, Inc. is adequately protected under the circumstances. MaxLinear, Inc. may have patents, patent applications, trademarks, copyrights, or other intellectual property rights covering subject matter in this document. Except as expressly provided in any written license agreement from MaxLinear, Inc., the furnishing of this document does not give you any license to these patents, trademarks, copyrights, or other intellectual property. MaxLinear, the MaxLinear logo, and any MaxLinear trademarks, MxL, Full-Spectrum Capture, FSC, G.now, AirPHY and the MaxLinear logo are all on the products sold, are all trademarks of MaxLinear, Inc. or one of MaxLinear’s subsidiaries in the U.S.A. and other countries. All rights reserved. Other company trademarks and product names appearing herein are the property of their respective owners. © 2020 MaxLinear, Inc. All rights reserved 6/6 maxlinear.com/XR21B1424 Rev 1B