Hello,
I purchased recently a GT-511C3 fingerprint sensor. When the sensor is on I can feel the chips are getting warm. I would not say it burns my finger or I cannot hold my finger on the chip, but still it is relatively warm. I checked the [datasheet and it says in the first chapter (1. Concept) “In the idle state, please turn off the whole fingerprint module. The sensor’s metal frame can be integrated with a touch IC to wake up the module.”
Does that mean this device cannot/should not be turned on all the time?
Do you have any experience running it for long time?
Regards,
Norbert](http://cdn.sparkfun.com/datasheets/Sensors/Biometric/GT-511C3_datasheet_V2.1_20161025.pdf)