Patent ID: 8912877

Claim:
An activation circuit for an electronic device, comprising: a first heat sensor located on the electronic device in a first location where a user of the electronic device is expected to handle the electronic device; a second heat sensor located on the electronic device in a second location where the user is not expected to handle the electronic device; and an activation circuit to activate a component in the electronic device when the electronic device is in a first environment that is room temperature and a difference in readings between the first heat sensor and the second heat sensor exceeds a first threshold to activate the electronic device at room temperature; and the activation circuit further conditionally adjusts readings from the second heat sensor to adjusted readings and activates the component when the electronic device is in a second environment having a second environment temperature reading that is less than room temperature whereby the second environment temperature reading is adjusted to a first adjusted reading, and the difference in readings between the first heat sensor and the first adjusted reading from the second heat sensor exceeds a second threshold to activate the electronic device at the temperature, the second threshold being different than the first threshold; and the electronic device is in a third environment having a third environment temperature reading that is more than room temperature whereby the third environment temperature reading is adjusted to a second adjusted reading and the difference in readings between the first heat sensor and the second adjusted reading from the second heat sensor exceeds a third threshold to activate the electronic device at the temperature, the third threshold also being different than the first threshold.