Difference between revisions of "MaxLinear XR21B1420IL28-0A-EVB USB to RS-232/422/485 Evaluation Board"

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(added partial bill of materials)
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[https://www.mouser.com/ProductDetail/MaxLinear/XR21B1420IL28-0A-EVB?qs=C8E66ftkQtzee90NEaObRg%3D%3D MaxLinear XR21B1420IL28-0A-EVB | Mouser]
 
[https://www.mouser.com/ProductDetail/MaxLinear/XR21B1420IL28-0A-EVB?qs=C8E66ftkQtzee90NEaObRg%3D%3D MaxLinear XR21B1420IL28-0A-EVB | Mouser]
  
−
=== Bill of Materials ===
+
== Wiring Diagram ==
 +
 
 +
{| class="wikitable"
 +
! DB9 Pin
 +
! RS-232
 +
! RS-422
 +
! RS-485
 +
|-
 +
| 1
 +
| DCD
 +
| TX-
 +
| Data-
 +
|-
 +
| 2
 +
| RXD
 +
| TX+
 +
| Data+
 +
|-
 +
| 3
 +
| TXD
 +
| RX+
 +
|
 +
|-
 +
| 4
 +
| DTR
 +
| RX-
 +
|
 +
|-
 +
| 5
 +
| colspan="3" | (GND)
 +
|-
 +
| 6
 +
| DSR
 +
|
 +
|
 +
|-
 +
| 7
 +
| RTS
 +
|
 +
|
 +
|-
 +
| 8
 +
| CTS
 +
|
 +
|
 +
|-
 +
| 9
 +
| RI
 +
|
 +
|
 +
|}
 +
 
 +
* [https://www.maxlinear.com/ds/sp339e.pdf#page=5 Page 5] of the SP339E datasheet shows the DE9 pinout
 +
 
 +
== Jumpers ==
 +
 
 +
{| class="wikitable"
 +
! Name
 +
! Default
 +
! Function
 +
|-
 +
| J2
 +
| 1 & 2 (down)
 +
| 1 &amp; 2 (down): VCC_OUT to VCC_TRANS<br/>2 &amp; 3 (up): VCC_USB to VCC_TRANS
 +
|-
 +
| J3
 +
|
 +
| pins map to DE9 connector, except pin 5 (GND) is skipped
 +
|-
 +
| J4
 +
|
 +
| 47k pull-ups to VCC_TRANS for jumpering to J18
 +
|-
 +
| J10
 +
| 1 &amp; 2 (right)
 +
| 1 &amp; 2 (right): VCC_USB to VCC_UART<br/>2 &amp; 3 (left): VCC_3V3 to VCC_UART
 +
|-
 +
| J11
 +
| (not present)
 +
| 1 &amp; 2 (left): VCC_OUT to VIO<br/>2 &amp; 3 (right): VIO_EXTERNAL to VIO
 +
|-
 +
| J12
 +
| 1 &amp; 2 (down)
 +
| 1 &amp; 2 (down): GPIO7/!RI/!RWK to SW1 button<br/> 2 &amp; 3 (up): GPIO7/!RI/!RWK to !RI_TRANS
 +
|-
 +
| J13
 +
| 2 &amp; 3 (left)
 +
| 1 &amp; 2 (right): VIO to VCC<br/>2 &amp; 3 (left): VCC_OUT to VCC
 +
|-
 +
| J15
 +
| 2 &amp; 3 (up)
 +
| 1 &amp; 2 (down):<br/>2 &amp; 3 (up)
 +
|-
 +
| J17
 +
| 2 &amp; 3 (up)
 +
| 1 &amp; 2 (down): TXT_MODE1 to TXT<br/>2 &amp; 3 (up): pullup/D1 LED to TXT
 +
|-
 +
| J18
 +
| ???
 +
| TODO
 +
|-
 +
| J19
 +
| (not present)
 +
| 1 &amp; 2: connects the regulated 3.3V from the SP6260 to the VCC pin of the XR21B1420
 +
|-
 +
| J20
 +
| 1 &amp; 2
 +
| 1 &amp; 2: GPIO9/!DSR to !DSR (transceiver) NOTE: manual claims GPIO2? schematic says GPIO9...
 +
|-
 +
| J21
 +
|
 +
| 1 &amp; 2 (down): XEN to J37 pin 3 <br/>2 &amp; 3 (up): !RTS_XEN to J37 pin 3
 +
|-
 +
| J23
 +
|
 +
| ...<br/>3 &amp; 4: VCC_USB to !RESET</br>...
 +
|-
 +
| J24
 +
|
 +
| (various debug signals)
 +
|-
 +
| J37
 +
|
 +
| ...<br/>3 &amp; 4 (2nd from left): XEN or !RTS_XEN to DIR1</br>...
 +
|}
 +
 
 +
== Software ==
 +
 
 +
To get full functionality under Linux, you must install the <code>xr_usb_serial_common</code> kernel module. The drivers are available here:
 +
 
 +
[https://www.maxlinear.com/support/design-tools/software-drivers Software Drivers - MaxLinear]
 +
 
 +
In the "USB UART" section in their downloads table, pick the latest version for Linux. Here is a direct link to version 1D for "Linux 3.6.x and newer":
 +
 
 +
[https://assets.maxlinear.com/web/documents/xr_usb_serial_common_lnx-3.6-and-newer-pak_v1d.zip xr_usb_serial_common_lnx-3.6-and-newer-pak_v1d.zip]
 +
 
 +
<del>[https://www.maxlinear.com/content/document.ashx?id=21651 xr_usb_serial_common_lnx-3.6-and-newer-pak.zip]</del> (1C was superseded by 1D)
 +
 
 +
If successfully installed, when the USB device (<code>04e2:1420 Exar Corp.</code>) is connected it the device node <code>/dev/ttyXRUSB0</code> should show up.
 +
 
 +
== Bill of Materials ==
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 27: Line 167:
  
 
[https://www.maxlinear.com/ds/xr21b1420.pdf MaxLinear XR21B1420 Datasheet]
 
[https://www.maxlinear.com/ds/xr21b1420.pdf MaxLinear XR21B1420 Datasheet]
 +
 +
[https://www.maxlinear.com/ds/sp339e.pdf MaxLinear SP339E Datasheet]
 +
 +
[https://www.maxlinear.com/product/interface/uarts/usb-uarts/xr21b1420 XR21B1420 - MaxLinear]
  
 
<del>[http://www.bdtic.com/download/exar/21623 Exar XR21B1420IL28-0A-EVB Evaluation Board User’s Manual Rev 1A]</del>
 
<del>[http://www.bdtic.com/download/exar/21623 Exar XR21B1420IL28-0A-EVB Evaluation Board User’s Manual Rev 1A]</del>

Latest revision as of 11:01, 17 January 2023

Overview

USB to serial evaluation board. Supports RS-232, RS-422, and RS-485. Made by MaxLinear, formerly Exar. Supposedly supports higher than usual baudrates, up to 12Mbaud.

MaxLinear XR21B1420IL28-0A-EVB | DigiKey

MaxLinear XR21B1420IL28-0A-EVB | Mouser

Wiring Diagram

DB9 Pin RS-232 RS-422 RS-485
1 DCD TX- Data-
2 RXD TX+ Data+
3 TXD RX+
4 DTR RX-
5 (GND)
6 DSR
7 RTS
8 CTS
9 RI
  • Page 5 of the SP339E datasheet shows the DE9 pinout

Jumpers

Name Default Function
J2 1 & 2 (down) 1 & 2 (down): VCC_OUT to VCC_TRANS
2 & 3 (up): VCC_USB to VCC_TRANS
J3 pins map to DE9 connector, except pin 5 (GND) is skipped
J4 47k pull-ups to VCC_TRANS for jumpering to J18
J10 1 & 2 (right) 1 & 2 (right): VCC_USB to VCC_UART
2 & 3 (left): VCC_3V3 to VCC_UART
J11 (not present) 1 & 2 (left): VCC_OUT to VIO
2 & 3 (right): VIO_EXTERNAL to VIO
J12 1 & 2 (down) 1 & 2 (down): GPIO7/!RI/!RWK to SW1 button
2 & 3 (up): GPIO7/!RI/!RWK to !RI_TRANS
J13 2 & 3 (left) 1 & 2 (right): VIO to VCC
2 & 3 (left): VCC_OUT to VCC
J15 2 & 3 (up) 1 & 2 (down):
2 & 3 (up)
J17 2 & 3 (up) 1 & 2 (down): TXT_MODE1 to TXT
2 & 3 (up): pullup/D1 LED to TXT
J18 ??? TODO
J19 (not present) 1 & 2: connects the regulated 3.3V from the SP6260 to the VCC pin of the XR21B1420
J20 1 & 2 1 & 2: GPIO9/!DSR to !DSR (transceiver) NOTE: manual claims GPIO2? schematic says GPIO9...
J21 1 & 2 (down): XEN to J37 pin 3
2 & 3 (up): !RTS_XEN to J37 pin 3
J23 ...
3 & 4: VCC_USB to !RESET
...
J24 (various debug signals)
J37 ...
3 & 4 (2nd from left): XEN or !RTS_XEN to DIR1
...

Software

To get full functionality under Linux, you must install the xr_usb_serial_common kernel module. The drivers are available here:

Software Drivers - MaxLinear

In the "USB UART" section in their downloads table, pick the latest version for Linux. Here is a direct link to version 1D for "Linux 3.6.x and newer":

xr_usb_serial_common_lnx-3.6-and-newer-pak_v1d.zip

xr_usb_serial_common_lnx-3.6-and-newer-pak.zip (1C was superseded by 1D)

If successfully installed, when the USB device (04e2:1420 Exar Corp.) is connected it the device node /dev/ttyXRUSB0 should show up.

Bill of Materials

Name Part
U2 MaxLinear SP339ECR1-L
U3 MaxLinear XR21B1420IL28-F

Online Resources

Exar XR21B1420IL28-0A-EVB Evaluation Board User’s Manual Rev 1A

Exar XR21B1420/21 Evaluation Board Schematic Rev 1.0

MaxLinear XR21B1420 Datasheet

MaxLinear SP339E Datasheet

XR21B1420 - MaxLinear

Exar XR21B1420IL28-0A-EVB Evaluation Board User’s Manual Rev 1A

Exar XR21B1420/21 Evaluation Board Schematic Rev 1.0

Exar XR21B1420/21 Evaluation Board Schematic Rev 1.0

running Due at 1Mbaud and 2.5M baud [SOLVED] | AVR Freaks

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