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Alex Hunter
02-06-2005, 05:25 AM
How much current can the Vdd pin source, assuming the stamp is powered by 9v on the VIN pin? I have seen this information in the past, but now I cannot find it.

Thanks for your help,
Alex Hunter

Forrest
02-06-2005, 06:16 AM
From the BASIC Stamp FAQ:
The built in 5-volt regulator on the BASIC Stamp I and BASIC Stamp II can supply 50 mA of current if powered by a 12-volt source. The BASIC Stamp IIsx’s regulator can supply 150 mA if powered by a 7.5-volt source. The BASIC Stamp I consumes 2 mA in running mode and the BASIC Stamp II consumes 7 mA. This leaves 48 mA and 43 mA respectively for use with other circuitry via the VDD pin and the I/O pins. The BASIC Stamp IIsx consumes 65 mA, leaving 85 mA for use with other circuitry via the VDD pin and the I/O pins.

The statement above assumes you're using the voltage regulator built into the BASIC Stamp. Note some boards, such as the Board of Education have their own 5 Volt regulator that's heatsinked and can provide more current - up to 1 Amp (I believe).