RS232 converter
What is this?
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.
How to power it the easy way
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.
How to power it the safe way
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.
How to make one
|
|
|
Circuit board bottom layout (PDF) |
Circuit board top layout (PDF) |
Circuit board component placement (PDF) |
Schematics (
big PNG 33kb) (
PDF)
Bill of materials
Part |
Value |
Device |
Package |
Description |
C1 |
0.1uF |
C-EUC0805 |
C0805 |
Capacitor |
C2 |
0.1uF |
C-EUC0805 |
C0805 |
Capacitor |
C3 |
0.1uF |
C-EUC0805 |
C0805 |
Capacitor |
C4 |
0.1uF |
C-EUC0805 |
C0805 |
Capacitor |
C5 |
1uF |
CPOL-EUCT3216 |
CT3216 |
Polarized Capacitor |
D1 |
BAS32 |
DIODE-SOD80C |
SOD80C |
Diode |
IC1 |
LP2980IM5 |
LP2980IM5 |
SOT23-5 |
3.3V Voltage regulator |
IC2 |
MAX3232CWE |
MAX3232CWE |
SO16 |
RS232 Transceiver |
P1 |
DSUB9 |
DSUB9 |
DSUB9 |
9-pin board mounted D-SUB, 90 deg. angle |
To make your life complete, here are Linus'
complete schematics made in Eagle 4.08r2.
Contents:
Archive: Rs232.zip
Length Date Time Name
-------- ---- ---- ----
14175 03-26-02 11:13 eagle.epf
7588 03-06-02 16:28 gerber.cam
10271 03-06-02 15:32 linus.lbr
848 03-26-02 13:50 README
570 03-26-02 13:18 RS232 Converter.bom
13443 03-26-02 10:57 RS232 Converter.brd
187210 03-06-02 16:18 RS232 Converter.sch
-------- -------
234105 7 files
Copyright © by the contributing authors.