PGA300: External Temperature Sensor in PGA300

Hello,

Please refer to that quote again:

"You should not place a resistor between INT+ and GND if you plan to use an external temperature sensor."

In order to use an external temperature sensor, you connect the sensor between INT+ and INT-. Adding a resistor between INT+ and GND will not work.

Regards,

Hello Scott:

We have to ground INT- (pin 22 in PGA300), if no ground there was NO current thru and NO voltage between RT100, we have tried on both our PCB and your EVM board. Please verify this again, thank you very much!

Ed

P.S. in previous post there was typo to INT+, it would be INT- (instead of INT+) with resistor and GND.

please see my latest post today, thanks!

Hello Scott:

I DO set up differential mode when I connect Pt1000 directly to INT+ and INT-, unfortunately, to both our PCB and your EVM board there was NO current thru and NO voltage to Pt1000.

And, there was current and voltage around Pt1000 if I ground INT-, but you suggested NOT to do so, so I do not know if the reading is meaningful.

Thank you for your patient help!

Ed