Electronics > Electronics
Sensitive Board: Protection suggestions?
Ratfink:
Im working with the following hardware:
www.isep.pw.edu.pl/ZakladNapedu/lab-skp/2812_ezdsp_TechRef_F.pdf
Its input/output pins are very sensitive and any variation in its input output configuration to actual inputs/outputs, voltage levels or any possible short between any pins causes the board to fail (I've managed to do this 3 out of 3 now doh!)
If anyone can suggest any buffers between the pins and its driving input/outputs it would be greatly appreciated.
Voltages the pins work on are 3.3V
nanob0t:
There are little wires for the pins. I think they are called jumper wires. You can make these and they're very reliable. I'll find a picture....
http://www.superdroidrobots.com/images/MCU-012-002.jpg
Take a look at that. They are "jumper wires". They consist of a small metal piece that latches onto pins and are soldered onto it. Then shrink wrap is shrunk around the connection. I se these for my development board and they are very reliable. You can either make these or you can buy them cheap.
Ratfink:
Hi thanks for your replay we've made these recently and are going to replace them with headers.
but we still have this problem...
Scenario 1:
if the intput/output configuration of the board doesn't match up exactly with what its driving
for example: pin is setup for output and connecting pin is driving an input to this pin
then board is fried.
Scenario 2:
driving the input pin over its maximum 3.3v rating then..
board is fried.
We need someway of effecitvely making sure no matter what pin settings or what we're connecting the board to (e.g. max232 chip, IR range finder, FPGA board) there is a intermediate stage which will protect the board from being fried.
Any suggestions would be welcomed
Ratfink:
To illustrate my problem further i have included a typical example
http://i12.tinypic.com/66c359k.jpg
Note: The pins on the DSP side are General Purpose Input Output Pins and i want to protect the Expensive thingy incase i make a mistake setting the GPIO to the wrong setting as illustrated.
Admin:
what about a diode or buffer IC? :P
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