Great help. Thank you all for the guidance
Regards,
Santosh
Michael Schippling wrote:
Just for reference, I recently discovered the ULN2803 8 channel driver
chip
that can do about .25A per pin, is cheaper than 8 equivalent transistors,
and has diode protection built in. Plus it's basically one input and one
output per channel, so only a bit more soldering on a breadboard...
Might be useful for the next B.man...
MS
Philip Levis wrote:
On Feb 19, 2007, at 2:51 PM, Joe Polastre wrote:
As per the f1611 datasheet (rtfm),
at 2.2V, the max is 1.5mA per pin and 12mA max over all ports
at 3.0V, the max is 6.0mA per pin and 48mA max over all ports
Thus, pal is using the devices outside of specified operating
conditions. It is recommended that you use a transistor to switch
larger currents.
Definitely true. I pushed the device to see what it would actually
do, not what the specified safe operating conditions were: I was
trying to see if I could have motes directly drive an EL-wire display
for burning man. Of course you can have the IO pins drive
transistors, but I was in a bit of a hurry and was seeing if I could
get around printing a board.
I was also pretty surprised that it would source so much beyond what
the datasheet said.
Phil
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