Current available on the 1.8 volt supply on the expansion connector

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#1

I am working on connecting an FPGA to the expansion connector on the
beagle board. I need to configure one bank of IO's on the FPGA to
operate at 1.8 volts to interface with the beagle. To do this I need a
1.8 supply to opwer the IO pins on the FPGA. I'd like to use the 1.8
volts from the expansion connector to do this. How much current can
the beagle board supply to peripherals?

Philip

#2

You are limited to 100mA. This is referenced in the Hardware Reference Manual in section 5.19.

Gerald

#3

You are limited to 100mA. This is referenced in the Hardware Reference
Manual in section 5.19.

Thanks. Anyone know if this will be enough to run an IO bank connected
to the Beagle. My attempts at remembering to read spec's suggest it
will be.

Philip

#4

It should be. The idea was to provide this rail for I/O level translation. It does depend on the FPGA being used, but most of them have it in banks as you say and as long as you are powering that bank only, it should be more than enough.

Gerald