Glenn, The specified range of this device is -40°C to 85°C, however it should operate all the way out to 125°C. Having a problem that comes in about 40°C seems unlikely. First, I wanted to verify the chip temperature. You said that the device was running about 36° to 38° with a room temperature of about 32°C. Does this temperature rise come from the device itself? or are there other sources of heat on the board? The power dissipation on this device is so low, I would expect the temperature rise to be less than 0.1°C (estimating thermal resistance to be 170°C/W). For the error that you see what values are you getting out of the ADC? As the device goes into an error mode, can you record the ADC output data and get me a series of values? I'd also like to get the good or expected values for comparison. I would also like to see the I2C communication coming from the device. Use a scope to capture the reads with and without the error. There might be something else dragging down the I2C lines so that the SDA or SCL is significantly distorted. Lastly, can you supply a basic schematic? It would be good to see what other devices are connected to the I2C and verify that they aren't affecting communications. Joseph Wu
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