Memsic 2125 Accelerometer

MichelB

Which temperature is given by T out pin (1) and how to get it?

sylvie369

From the datasheet:

2125 datasheet drone said...
TOUT – This pin is the buffered output of the temperature
sensor. The analog voltage at TOUT is an indication of the
die temperature. This voltage is useful as a differential
measurement of temperature from ambient and not as an

absolute measurement of temperature.

You'll need an ADC or RCTIME circuit to read it, and as you can see, it might not be what you're hoping it would be anyway.

MichelB

OK, thank you for your reply. Can you give a schematic of RCTIME to read this voltage?

Franklin

Take a look at the description of RCTIME in the help section of the editor.

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- Stephen

MichelB

I know how RCTIME works, a capacitor and a resistor but I don't know how it works with the T out pin of Memsic 2125.

Franklin

Tout is a voltage. RCTIME is used to measure a voltage. What don't you understand? Hook up Tout where you would hook the voltage to be measured by RCTIME and run the program....

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- Stephen

Mike Green

If you have not already, look at Tracy Allan's website www.emesystems.com under the "app-notes" link. You'll see a discussion on using RCTIME including how to use it to measure voltages. He includes drawings and component values. Treat Tout just like Tracy treats a battery voltage.

MichelB

Yes, it's a good idea but needs stable components (681 kohm +- 1%) and can't work with voltage under threshold voltage of the BASIC Stamp chip. Memsic 2125 has an output calibrated to 1.25 volts at 25.0° C and the output change is 5 mV / °C. I'll try with an external analog to digital converter. Thank you for your help.

P.S.: I think that Activity #1, Chapter 6, page 182 "Testing the LM34" of Process Control can be used for Memsic 2125. What do you think Mike?




Post Edited (MichelB) : 10/29/2009 5:27:02 PM GMT