Hi all,
I am trying to set up a variant of I2C communication using a PXIe-6341 (and a SCB-6A). The Sensiron SHT-75 sensors use open collector (open drain) digital communication similar to I2C, but without multiple device addresses.
I want to communicate with 3 of these sensors. I plan to wire them up with a common clock and a separate digital line to the data pin for each sensor. Since it is recommended to provide them with 3.3V for calibration reasons (they will run on 5V) I was also thinking of using an analog output line for the power. Each sensor has a maximum current draw of 1 mA and the analog out is rated to 15 mA. I can use the 5V power line, but as I say, the manufacturer recommends 3.3 V.
The precise software I am planning on running is here: https://forums.ni.com/t5/LabVIEW/Sensirion-sht7x-labview/m-p/901063#M406440
I cannot find the specs anywhere on the type of DIO offered by the 6341. I have gone through the spec sheet with a fine toothed comb and found nothing. Am I looking in the wrong place? Why is this not a listed spec for the digital IO lines? How to I find out if this DIO hardware is open drain as opposed to push-pull (active drive)? I have the sneaking suspicion that I am missing something. . . ?
To sum up, can I carry out open drain communication to multiple SHT-75 sensors using a PXIe-6341? (And why is this not in the hardware specs?)
Thank you in advance for any assistance.