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XR21B1424IV64-0A-EVB

1. EXAR XR21B14241V64 0A EVB Evaluation Board User s Manual A New Direction in Mixed Signal Introduction This user s manual is for the XR21B14241V64 0A EVB evaluation board The XR21B14241V64 F shares a common evalua tion board with the XR21B14221L40 F The main difference between the XR21B14241V64 F and the XR21B14221L40 F is the number of UART channels The XR21B14241V64 F has 4 UART channels The XR21B14221L40 F has 2 UART chan nels The only USB UART device installed on the XR21B14241V64 0A EVB evaluation board is the XR21B14241V64 F Table 1 Evaluation Board Ordering Part Numbers Device Ordering Part Number Evaluation Board Ordering Part Device Package Device Number Location XR21B14241V64 F XR21B14241V64 0A EVB 64 pin LQFP XR21B14221L40 F XR21B14221L40 0A EVB 40 pin QFN Evaluation Board Overview A block diagram of the evaluation board is shown in Figure 1 below SP338 DB9 4 SP339 Connector SP338 DB9 MM SP339 Connector USB X Connector 4 gt XR21B1424 SP338 DB9 d SP339 Connector n DB9 Connector E SP338 SP339 1 Figure 1 Evaluation Board Block Diagram In addition to the XR21B14241V64 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 nex
2. e 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 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 2014 Exar Corporation 5 6 exar com XR21B1424 Rev 1A XR21B14241V64 0A EVB Revision History Revision Description 1A April 2014 Initial release For Further Assistance Email UARTtechsupport exar com EXA R Exar Technical Documentation http www exar com techdoc Exar Corporation Headquarters and Sales Offices A New Direction in Mixed Signal 48720 Kato Road Tel 1 510 668 7000 Fremont CA 95438 USA Fax 1 510 668 7001 NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design performance or reliability EXAR Corporation assumes no responsibility for the use of any circuits described herein conveys no license under any patent or other right and makes no representation that the circuits are free of patent infringement Charts and schedules contained herein are only for illustration purposes and ma
3. in 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 amp 6 Not installed GPIOA9 RXTA is not connected to the MODE2 pin of the SP339 J10 5 amp 6 Not installed GPIOB9 RXTB is not connected to the MODE2 pin of the SP339 J11 5 amp 6 Not installed GPIOC9 RXTC is not connected to the MODE2 pin of the SP339 J20 5 amp 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 RS 232 settings for the SP339 Table 9 SP339 RS 232 Mode Pin Configurations Mode Configuration MODEO 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 chan nel 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 th
4. lex direction control feature for this pin Table 6 Default Jumper Setting for GPIO7 RS485 J3 1 amp 2 Not installed GPIOA7 RS485A is not connected to the DIR1 pin of the SP339 J10 1 amp 2 Not installed GPIOB7 RS485B is not connected to the DIR1 pin of the SP339 J11 1 amp 2 Not installed GPIOC7 RS485C is not connected to the DIR1 pin of the SP339 J20 1 amp 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 J5 3 amp 4 Not installed GPIOA8 TXTA is not connected to the MODE1 pin of the SP339 J10 3 amp 4 Not installed GPIOB8 TXTB is not connected to the MODE 1 pin of the SP339 J11 3 amp 4 Not installed GPIOC8 TXTC is not connected to the MODE1 pin of the SP339 J20 3 amp 4 Not installed GPIOD8 TXTD is not connected to the MODE1 pin of the SP339 2014 Exar Corporation 4 6 exar com XR21B1424 Rev 1A XR21B14241V64 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 p
5. n external 3 3V can be supplied to VCC_REG via J27 pin 2 GPIO Configurations GPIOAO RIA RWKA When shipped from the factory the GPIOAO 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 GPIOAO RIA RWKA Jumper Setting Description J25 2 amp 3 GPIOO RI RWK connected to SW1 Can be used for remote wake up Changing the header to J25 1 amp 2 will connect the GPIOAO RIA RWKA pin to the SP338 SP339 transceiver GPIOO GPIO5 Besides GPIOO of channel A GPIOO 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 Jumper Setting Description J5 7 6 amp 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 amp 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 amp 8 USB STAT2 enables disables the SP339 transceiver for channel C When this jumper is removed the internal pull down
6. resistor for the ENABLE pin disables the SP339 J20 7 amp 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 2014 Exar Corporation 3 6 exar com XR21B1424 Rev 1A XR21B14241V64 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 cap tured via the J31 header If using this pin to control the MODEO pin of the SP339 install jumpers for the appropriate chan nels 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 J5 1 amp 2 Not installed GPIOA6 CLKA is not connected to the MODEO pin of the SP339 J10 1 amp 2 Not installed GPIOB6 CLKB is not connected to the MODEO pin of the SP339 J11 1 amp 2 Not installed GPIOC6 CLKC is not connected to the MODEO pin of the SP339 J20 1 amp 2 Not installed GPIOD6 CLKD is not connected to the MODEO 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 dup
7. t 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 1 6 exar com XR21B1421 Rev 1A XR21B14241V64 0A EVB ia aba eecccce DIRa 25R RTS T s Pla aru 9990 Lm 29 DICTI geile ad xi A crsag a coes ms e SINN d REB mR Li bss R KE e 455 STATI n D 3 02 50 vi 140 ET 0 1 9u ver T e2vigT2uX psbog vol RIED R30 D n Quim 832 EI 030m Ald cTSdWeSd 258d OTRA TOA 40d Cod Figure 2 Top View of Evaluation Board 2014 Exar Corporation 2 6 exar com XR21B1424 Rev 1A XR21B14241V64 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 amp 2 Connects 5V from VBUS to VCC REG pin 13 A regulated 3 3V output will be avail able on the VCC pin pin 12 J35 1 amp 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 a
8. y vary depending upon a user s specific application While the information in this publication has been carefully checked no responsibility however is assumed for inaccuracies EXAR Corporation 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 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 Reproduction in part or whole without the prior written consent of EXAR Corporation is prohibited 2014 Exar Corporation 6 6 exar com XR21B1424 Rev 1A

XR21B1424IV64-0A-EVB

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