Can someone help me figure the current draw?

Oldbitcollector (Jeff)

I need some help with coming up with the "current draw" of the following items.

64k Eeprom, Propeller, and 3v regulator.

I've got a project idea that would use a Propeller, but my existing 5v supply can not be over 50mA.

Thanks!
Jeff

Peter Jakacki

Oldbitcollector (Jeff) wrote: »

I need some help with coming up with the "current draw" of the following items.

64k Eeprom, Propeller, and 3v regulator.

I've got a project idea that would use a Propeller, but my existing 5v supply can not be over 50mA.

Thanks!
Jeff

At 80MHz each cog draws 10ma in a Spin loop and the EEPROM is really low-power and only really used at boot-time when there is only one cog running at 12MHz. Of course a lot depends upon your software, how many cogs you fire up, and the loading that you have on the port pins etc but in principle I don't see any problems with this requirement of 50ma max. The typical regulator is not part of the equation, there is a very minor current drain but nothing to worry about.

Oldbitcollector (Jeff)

Thanks Peter!

JonnyMac

I was just looking up EEPROM current draw the other day for a layout and the specs are highest when writing, about 4mA. When not writing, it drops to microamps.

LoopyByteloose

In general, the slower you clock.. the less power the Propeller consumes.

With that 50ma limit, it seems that only 5 cogs running full out at 80mhz is possible.

If you hit a barrier that requires more cogs, slowing down to 40mhz might easily allow all the cogs to work well. But you also need to budget power for whatever the 32 i/o pins might be driving.