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Precision Amplifiers Forum
Temperature Monitoring Using PGA309
I have a taken up a task of designing a universal temp monitoring systems which would operate over a wide range of temperature(-200 to 800). I want it to be compatible with different types of sensors like thermocouples, RTD's etc. But for me it is very difficult because i am very weak in analog circuits which is the most essential think for conditioning of sensor signals. So i came to TI for help and here i found the PGA309 which i must say is a fascinating piece of semiconductor. But this device is so full of features that it eventually becomes complex. I have been reading the data sheet for quite some days now, but still don't have a clear view about how to do things. I have many questions to list a few.
1. The data sheet explains PGA309 as an independent system directly controlling an EEPROM without a microcontroller, is that possible?
2. The EEPROM is said to have 17 coefficient values. what are these coefficient values, if i design that system from where will i get those values?
3. Why the Bridge sensor is used with the actual sensing element, can we simply connect the sensor in series with a resistor to form a voltage divider,will that work?
Oh! no i guess i have got it seriously wrong , going through the data sheet of PGA i get a sense that it can only be used in a temperature range of -40C to +125C, is that true.
The temperature range of the IC is limited to -40 to 125C; however, this does not mean that your RTD, thermistor, thermocouple, etc. cannot be in an environment such as an oven that exceeds this temperature range.
But can you please also provide some guidelines on my first question.
Please help me people with your valuable feeds, its such i great place for learning and a source of guidance....plz help TI employees and all u xperts out there..
I have been extensively exploring the available resources in order to bring this project to reality, and i have got some great literature which helped to understand the product better. I am using a J type thermocouple, and i want to use the TI TMP275 for its COld Junction Compensation, but i don't have any idea how to stick the IC to the cold junction such that accurately senses the temp of the cold end ( I mean to say the IC will be soldered on the PCB and it is meant to sense the ambient surrounding temperature. How should i interface it with the COld junction.
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