USB output characteristics / optocouplers

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SUMMARY

The discussion centers around the output characteristics of the USB-6501 device, specifically regarding its compatibility with optocouplers and MOSFETs. Key points include the complexity of the USB output signals, which involve differential pairs with varying DC voltages, and the necessity of understanding the signal specifications before interfacing with other components. The user seeks clarification on terms like "push-pull" and the implications of negative current readings. The referenced document provides essential details on digital output voltages and currents.

PREREQUISITES
  • Understanding of USB 2.0 and USB 1.0 signal specifications
  • Knowledge of push-pull output configurations
  • Familiarity with optocouplers and their applications in driving MOSFETs
  • Ability to interpret digital output voltage and current data
NEXT STEPS
  • Research the differences between USB 1.0 and USB 2.0 signal characteristics
  • Study push-pull output configurations and their advantages in circuit design
  • Learn about interfacing optocouplers with MOSFETs for signal isolation
  • Examine the digital output specifications in the NI USB-6501 manual
USEFUL FOR

Electronics engineers, hardware developers, and anyone involved in interfacing USB devices with optocouplers and MOSFETs will benefit from this discussion.

JJ91
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Hello,

the table below represent output values of a device which is connected to USB port:
(device used is USB-6501)

Untitled.jpg


Its first time I see such output values and thus I don't understand the following:
- What is push-pull ?
- Negative current means that I should supply the device with such value ?
- Which output is most suitable for optocoupler which will drive MOSFETS ?

Regards,
Tom
 
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What table?

They are two differential pairs with different DC voltages. It is not simple signal only, different DC signal different devices. The front end knows whether you hook up an USB1 that run at 1MHz or USB2 that is a lot faster. It is a lot more complicated, read the signal spec first. I don't think it can interface to a optocoupler or MOSFET and make it work that easily.
 
Last edited:
The picture hosting server is pretty bad I guess...

In this document on page 17 there is Digital Output voltages and currents which I'm not sure how to read out.
http://www.ni.com/pdf/manuals/371456h.pdf

Thanks, Tom.
 

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