PGA305: Beginner question with PGA305

Steve Gosselin

Part Number: PGA305
Other Parts Discussed in Thread: ADS122C04

Hello,

I believe the PGA305 is the correct choice to integrate into our product. Forgive me as a beginner but there are some basics that I am having trouble to understand. I just want to read the resistance of a sensor. The resistance ranges from 1Kohm to 100Kohm. In the bridge design then I was planning to use 3 of the resistors at a fixed value, say 50Kohm and the 4th would be my sensor that has an unknown resistance. I want to read the PGA305 with I2C, which register do I read to get the information necessary to calculate the unknown resistance of my sensor?

Thanks,

Steve

over 5 years ago

0 Scott Cummins over 5 years ago

TI__Mastermind 31655 points

Hi Steve,

What is the application that you will be using this in? If your only required output is digital over I2C, you may be better off looking into the ADS122C04. It has an integrated PGA, but does not include the DAC output (which sounds like it is unnecessary in your use case) or the compensation engine. Because of this, it is much simpler to use, but should still provide the features you need.

Regards,

0 Steve Gosselin over 5 years ago in reply to Scott Cummins

Prodigy 20 points

Thanks very much Scott. I will give that a go.

Steve

Sensors

Sensors forum

PGA305: Beginner question with PGA305