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Incorrect value 03FF coming from remote XBEE s2. ADC input max?

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I have a simple MCP9700A hooked up to a remote XBEE Series 2.
Actually 3 thermistors.
2 work fine around room temp, but one is in a "oven" type environment and although I can PHYSICALLY measure the voltage coming from the MCP as 1.53 mv, (around 225F) for some reason the XBEE is only sending a value of "3" and "255" as the MSB and LSB,.. which equates to a 1000 mv and thus 158 degrees F. My oven is between 200 & 225, well within the limits of the thermistor.

OK, so the MCP is working perfectly, but why would the XBEE ignore the input voltage? Basically truncatating it/capping it?
Is there something peculiar with the ADC on the XBEE. Did I miss a configuration in XCTU? Its too tidy to be sending EXACTLY x03FF. I can watch the oven heat up and temps are right until it caps at 1000mv and never goes higher.

asked May 27, 2014 in XBee Programmable Development by Jaymer New to the Community (0 points)

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1 Answer

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The ADC inputs on the XBee ZB module is from 0 - 1.2V max.
answered May 28, 2014 by mvut Veteran of the Digi Community (15,323 points)