All, I'm using geda (hence the S.lightly in SOT :-) ) to build a small, ~ 1 inch by 1 inch board. It has a PIC10F202 on it and a small vibrating motor. I need to turn the motor on and off with the pic. The board is powered by a 3V coin cell.
Since the motor typically draws 100mA, and the pic can only source/sink 20mA, I need a switch. I've looked at transistors, MOSFETs, and now CMOS. The NXP 74CBTLV1G125 [1] looks like what I need. The package fits my size requirements (SOT23-ish), and everything I can figure out in the datasheet [2] looks good. Two things concern me. I'm new to circuit/board design and I'm probably missing something obvious. Is there a different part I should look at before I commit to this one? It would be nice to find a cheaper alternative that is just as good, or close. Second, the pic has weak pull-up resistors on two of its outputs (GP0 and GP1), so I don't need an external pull-up on the OE pin of 74CBTLV1G125. Do I need a large resistor between the pic output pin and the OE input pin of the 74CBTLV1G125? It's not a problem if I do, I'm just trying to reduce component count wherever possible. I've been unable to find any reference circuits or application notes for this chip... :-( tia, Jason. [1] - http://www.nxp.com/pip/74CBTLV1G125_1.html# [2] - http://www.nxp.com/documents/data_sheet/74CBTLV1G125.pdf _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
