Method and apparatus for battery removal detection
AssigneeSony Ericsson Mobile Communications AB
InventorsJohan ALFVEN, Turan CALISKAN
Life of this patent
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Abstract
The present invention relates to a method for battery removal detection in a portable communication device and also to a portable communication device comprising a detection circuit (2). During start-up of the portable communication device the detection circuit (2) is powered on and a first input (A) of the detection circuit (2) is set to a first logical level and a second input (B) of the detection circuit (2) is set to a second logical level. An output (q) from the detection circuit (2) is fed to a third input (Q) of the detection circuit (2) and a new output value (q) for the detection circuit (2) is generated based on the first (A), second (B) and third input (Q) and the new value of the output (q) is stored in a memory means.
Claims15
Method for detecting if a battery has been removed from a portable communication device comprising the steps of:
- powering on a detection circuit during start-up of the portable communication device;
- setting a first input of the detection circuit to a first logical level;
- setting a second input of the detection circuit to a second logical level;
- feeding an output from the detection circuit to a third input of the detection circuit;
- generating a new output value for the detection circuit based on the first, second and third input, and
- saving the new value of the output in a memory means.
Portable communication device comprising a battery and a detection circuit for subsequently detecting if the battery has been removed from the portable communication device, wherein the detection circuit comprises a first input connected to the battery and a second input connected to an adjustable power supply configured to output a second logical level during startup of the portable communication device.
Dependencies are inferred from the claim text.