lines of NI8451 output level translator 3.3 to 5V on SPI

Hi all

If I use a NI8451 to talk to my DUT via SPI. I notice that the highest level of SPI tension disc is 3.3V. However, my NI DAQ SPI lines are each connected to a UPS (74HC14) on my HAD and my ups output is given me some odd readings. I think that the 3.3V signal generated by the 8451 is not always interpreted as a TTL high signal by the ups because it is falling between the thresholds high and low level. So, I want to implement a 3.3-> translator level 5V on my SCLK, MOSI, and CS lines so that the TTL levels are not be misread by the inverter.

I tried to use a SN7407 (open collector driver) with resistance to pull-up 10 k out 5V on all 3 of my SPI lines. I don't know if this is the correct way to do because the signals on my scope are not fair (SCLK don't work) and do not know if NI8451 e/s lines can support. I have attached a diagram of my connections. If someone could help me please on how to do this, I would be very happy!

Thanks again.

Serge

So missed me the resistance of the output of my data acquisition at the entrance of my level shifter. I guess I need this voltage drop on the SPI lines so that they would not be potentially exposed to receive a kickback of 5V.

And I also had a floating floor which I forgot to connect ><>

The circuit works now with emitting SPI signals to the 5V level

Tags: NI Hardware

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