2002-03-27 09:47:34 +00:00
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#define _PAGE_ RS232 converter
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#include "head.t"
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<h2>What is this?</h2>
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<p>
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This is an RS232 converter for interfacing a PC with an Archos Jukebox (or any other device with a 3.3V serial port). It converts the PC serial port signals to 3.3V levels. The design is very straightforward, using a standard MAX3232 transceiver.
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<h2>How to power it the easy way</h2>
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<p>
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It takes its power from the DTR signal in the serial port, so the communication software in the PC must set the DTR signal ACTIVE for this to work. It might still not work on some laptops, that may have a weak driver for the DTR signal.
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<h2>How to power it the safe way</h2>
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<p>
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2002-03-28 09:55:46 +00:00
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If your PC is a laptop or otherwise might risk having too little power in the serial port, it is also possible to take power from the USB port or another 5-10V source. Just remove the D1 diode and connect the power to the +5V and GND pads.
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2002-03-27 09:47:34 +00:00
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<h2>How to make one</h2>
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<p><img src="rs232_board_bottom.png">
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<br>Circuit board bottom layout
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(<a href="rs232_board_bottom.pdf">PDF</a>)
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<p><img src="rs232_board_top.png">
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<br>Circuit board top layout
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(<a href="rs232_board_top.pdf">PDF</a>)
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<p><img src="rs232_board_place.png">
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<br>Circuit board component placement
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(<a href="rs232_board_place.pdf">PDF</a>)
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<p><a href="rs232_schematic_big.png"><img src="rs232_schematic.png"></a>
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<br>Schematic
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(<a href="rs232_schematic_big.png">big PNG</a> 33kb)
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(<a href="rs232_schematic.pdf">PDF</a>)
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<h2>Bill of materials</h2>
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<pre>
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Part Value Device Package Description
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C1 0.1uF C-EUC0805 C0805 Capacitor
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C2 0.1uF C-EUC0805 C0805 Capacitor
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C3 0.1uF C-EUC0805 C0805 Capacitor
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C4 0.1uF C-EUC0805 C0805 Capacitor
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C5 1uF CPOL-EUCT3216 CT3216 Polarized Capacitor
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D1 BAS32 DIODE-SOD80C SOD80C Diode
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IC1 LP2980IM5 LP2980IM5 SOT23-5 3.3V Voltage regulator
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IC2 MAX3232CWE MAX3232CWE SO16 RS232 Transceiver
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P1 DSUB9 DSUB9 DSUB9 9-pin board mounted D-SUB, 90 deg. angle
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</pre>
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<p>To make your life complete, here is Linus'
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<a href="rs232_eagle.zip">complete schematics</a> made in Eagle 4.08r2.
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<p>Contents:
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<pre>
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Archive: Rs232.zip
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Length Date Time Name
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-------- ---- ---- ----
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14175 03-26-02 11:13 eagle.epf
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7588 03-06-02 16:28 gerber.cam
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10271 03-06-02 15:32 linus.lbr
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848 03-26-02 13:50 README
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570 03-26-02 13:18 RS232 Converter.bom
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13443 03-26-02 10:57 RS232 Converter.brd
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187210 03-06-02 16:18 RS232 Converter.sch
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-------- -------
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234105 7 files
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</pre>
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#include "foot.t"
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