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Visitor cangyisu
Visitor
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Registered: ‎06-27-2019

pmod voltage

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Hi, I use a Nexys 7A FPGA board and feel concerned about the 12-pin pmod ports (see image):

1. What is the voltage value Pin1-4 and Pin 7-10 will provide? I get a voltage range 3.3V on oscilloscope but there is a DC offset (i.e. it's not 0~3.3V but something -2.2~1.1V)

2. I try to measure pin 6 and 12 (Vcc) and find that they don't provide 3.3V. Can you explain why?

Thank you!

 9.JPG

 

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Scholar u4223374
Scholar
159 Views
Registered: ‎04-26-2015

Re: pmod voltage

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@cangyisu Where are you connecting the oscilloscope ground clip?

 

Voltage is relative. You should see 3.3V between pin 5 and pin 6 (or between pin 11 and pin 12). If you're just measuring from a floating ground to the VCC pin, then you'll get a more-or-less random value.

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Community Manager
Community Manager
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Registered: ‎08-08-2007

Re: pmod voltage

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Hi @cangyisu 

 

As this is a Digilent product you may get more useful responses on the Digilent Forum : https://forum.digilentinc.com/

 

Sandy

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Scholar u4223374
Scholar
160 Views
Registered: ‎04-26-2015

Re: pmod voltage

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@cangyisu Where are you connecting the oscilloscope ground clip?

 

Voltage is relative. You should see 3.3V between pin 5 and pin 6 (or between pin 11 and pin 12). If you're just measuring from a floating ground to the VCC pin, then you'll get a more-or-less random value.

View solution in original post

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