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MaxLinear XR21B1420IL28-0A-EVB USB to RS-232/422/485 Evaluation Board
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Revision as of 23:45, 15 January 2023
1,438 bytes added
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23:45, 15 January 2023
added jumper information
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* [https://www.maxlinear.com/ds/sp339e.pdf#page=5 Page 5] of the SP339E datasheet shows the DE9 pinout
* [https://www.maxlinear.com/ds/sp339e.pdf#page=5 Page 5] of the SP339E datasheet shows the DE9 pinout
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== Jumpers ==
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{| class="wikitable"
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! Name
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! Default
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! Function
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|-
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| J2
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| 1 & 2 (down)
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| 1 & 2 (down): VCC_OUT to VCC_TRANS<br/>2 & 3 (up): VCC_USB to VCC_TRANS
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|-
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| J3
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|
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| pins map to DE9 connector, except pin 5 (GND) is skipped
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|-
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| J4
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|
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| 47k pull-ups to VCC_TRANS for jumpering to J18
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|-
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| J10
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| 1 & 2 (right)
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| 1 & 2 (right): VCC_USB to VCC_UART<br/>2 & 3 (left): VCC_3V3 to VCC_UART
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|-
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| J11
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| (not present)
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| 1 & 2 (left): VCC_OUT to VIO<br/>2 & 3 (right): VIO_EXTERNAL to VIO
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|-
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| J12
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| 1 & 2 (down)
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| 1 & 2 (down): GPIO0/!RI/!RWK to SW1 button<br/> 2 & 3 (up): GPIO0/!RI/!RWK to !RI_TRANS
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|-
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| J13
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| 2 & 3 (left)
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| 1 & 2 (right): VIO to VCC<br/>2 & 3 (left): VCC_OUT to VCC
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|-
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| J15
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| 2 & 3 (up)
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| 1 & 2 (down):<br/>2 & 3 (up)
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|-
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| J17
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| 2 & 3 (up)
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| 1 & 2 (down): TXT_MODE1 to TXT<br/>2 & 3 (up): pullup/D1 LED to TXT
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|-
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| J18
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| ???
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| TODO
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|-
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| J19
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| (not present)
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| 1 & 2: connects the regulated 3.3V from the SP6260 to the VCC pin of the XR21B1420
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|-
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| J20
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| 1 & 2
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| 1 & 2: GPIO9/!DSR to !DSR (transceiver) NOTE: manual claims GPIO2? schematic says GPIO9...
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|-
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| J21
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|
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| 1 & 2 (down): XEN to J37 pin 3 <br/>2 & 3 (up): !RTS_XEN to J37 pin 3
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|-
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| J23
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|
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| ...<br/>3 & 4: VCC_USB to !RESET</br>...
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|-
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| J24
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|
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| (various debug signals)
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|-
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| J37
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|
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| ...<br/>3 & 4 (2nd from left): XEN or !RTS_XEN to DIR1</br>...
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|}
== Software ==
== Software ==
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