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Forum Post: RE: TMP101 ALERT Output

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Hello Hisakichi-san,

Please check on the following possible causes of the issue here:

1. Do you have a bypass capacitor at the power suppy? The reason I ask is 70msec may not be enough time and TMP101 internally has an ultra-low power reset circuitry that will not completely reset unless the voltage level goes down all the way to 0V. There is a good chance that this is occurring or the bypass capacitor (if it exists) is not completely discharged before customer powers it back on after 70ms. Can yoiu check for Voltage levels using a scope. Also how long is the device ON for Initially?

2. Is the customer changing any default settings on the ALERT pin by writing to the Configuration register?

3. Does the ALERT pin has an external pull-up?

It would help debug if you provide more information like scopeshots, achematic etc

Regards,

Abhi


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