I'm having trouble with PFI 24..31 signals and can't program to higher drive

Hi all,
I'm having trouble setting up my PFI<24..31> signals on my PXIe-6556. According to the specifications, I can drive these signals to +/-85mA. I have not been able to achieve that using the static PFI method using NI-HSDIO. I see the voltage dropout rather quickly. Using a 500 ohm resistor to ground on this signal, the voltage collapses from 3.3V to 3.0V with only approximately 6mA of current across resistor.
What am I doing wrong?
Solved!
Go to Solution.
Attachments:
PFI_ENABLE.vi ‏23 KB

To explain the circuit, it is simplified a 3.3V power rail connected to the 50 ohm output impedance, which acts like a series resistance. Given this, we do not behave like a LDO or a current supply, and any load connected to the line is going to behave much like a voltage divider rather than a regulator.
The case of tying the line directly to GND, you will see 3.3V / 50 ohm to get 66 mA of output current. The only way to get the full 85 mA is to tie the line to a -0.9 V reference, which is not very practical I understand. Talking to a HW engineer here, the spec is mainly based off the buffer we use and what it is capable of. I think it makes more sense when it is understood that the line is bidirectional, and it can source/sink 85 mA when being acted upon by an external circuit.
Given all of this, I think it won't be suited well enough to drive a 500 ohm load to the specifications you need. You'll need to have some external circuit that can source 85 mA, or another device such as an SMU. The PPMU on the 6556 can source 32 mA (and beyond, we are not current limited, but anything above 32 mA is not within specification and sustained operation outside of spec could damage the board over time). You can use the PPMU as a source, since it acts more like an SMU and has a sense feedback loop to regulate a voltage/current on the line.
Sorry for the inconvenience, hopefully you have enough information to move forward. Thanks.
Kyle A.
National Instruments
High Speed Digital I/O Product Support Engineer - R&D

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I'm having trouble with PFI 24..31 signals and can't program to higher drive

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