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The change in temperature of an implanted electronic device can be determined by providing power to one or more circuit elements included in the implanted electronic device, wherein the circuit elements comprise a non-crystal oscillator. A shift in the output frequency associated with the non-crysta

The change in temperature of an implanted electronic device can be determined by providing power to one or more circuit elements included in the implanted electronic device, wherein the circuit elements comprise a non-crystal oscillator. A shift in the output frequency associated with the non-crystal oscillator can be detected, and the temperature change of the implanted electronic device can be determined based on the detected output frequency shift. One or more signals based on the output frequency associated with the non-crystal oscillator can be transmitted by the implanted electronic device. The transmitted signals can be received by an external device, which can detect the current output frequency associated with the non-crystal oscillator from the transmitted signals and compare the current output frequency with a previous output frequency to determine the output frequency shift associated with the non-crystal oscillator. The output frequency can, for example, be converted to a voltage measure.

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What is claimed is: 1. A method comprising: receiving a signal transmitted by an implantable electronic device, wherein a transmission frequency of the received signal corresponds to an output frequency associated with a non-crystal oscillator included in the implantable electronic device; comparin

What is claimed is: 1. A method comprising: receiving a signal transmitted by an implantable electronic device, wherein a transmission frequency of the received signal corresponds to an output frequency associated with a non-crystal oscillator included in the implantable electronic device; comparing the transmission frequency of the received signal with an initial value to detect a frequency shift; and determining a change in temperature of the implantable electronic device based on the detected frequency shift. 2. The method of claim 1, wherein the received signal comprises an unmodulated signal. 3. The method of claim 1, wherein the initial value comprises a transmission frequency of a signal transmitted by the implantable electronic device prior to a charging operation. 4. The method of claim 1, wherein the received signal comprises a modulated signal including data representing a status of the implantable electronic device. 5. The method of claim 4, further comprising: determining a voltage change of a rechargeable power source included in the implantable electronic device based on the data representing the status of the implantable electronic device; and factoring out of the detected frequency shift a component corresponding to the voltage change. 6. The method of claim 1, further comprising: factoring out of the detected frequency shift a component corresponding to aging of the implantable electronic device. 7. The method of claim 1, further comprising: adjusting a charging field based on the determined change in temperature. 8. The method of claim 1, further comprising: storing the transmission frequency of the received signal as the initial value before initiating a charging operation. 9. The method of claim 1, further comprising: determining the transmission frequency of the received signal by one or more of measuring pulse-width, determining a time interval between successive rising edges, and counting a number of pulses received within a time period. 10. A system for determining a change in temperature of an implantable electronic device, the system comprising: an implantable electronic device configured to transmit a signal, wherein a transmission frequency of the transmitted signal corresponds to an output frequency associated with a non-crystal oscillator included in the implantable electronic device; and an external controller including processor electronics configured to perform operations comprising: receiving the transmitted signal; comparing the transmission frequency of the transmitted signal with an initial value to detect a frequency shift; and determining a change in temperature of the implantable electronic device based on the detected frequency shift. 11. The system of claim 10, wherein the implantable electronic device and the external controller are inductively coupled through an electromagnetic field. 12. The system of claim 11, wherein the processor electronics included in the external controller are further configured to perform operations comprising: adjusting a strength of the electromagnetic field based on the determined change in temperature. 13. The system of claim 10, wherein the transmitted signal comprises an unmodulated signal. 14. The system of claim 10, wherein the initial value comprises a transmission frequency of a signal transmitted by the implantable electronic device prior to a charging operation. 15. The system of claim 10, wherein the processor electronics included in the external controller are further configured to perform operations comprising: factoring out of the detected frequency shift a component corresponding to one or more of (i) aging of the implantable electronic device and (ii) a voltage change in a rechargeable power source included in the implantable electronic device. 16. The system of claim 10, wherein the output frequency associated with the non-crystal oscillator comprises a center frequency of the non-crystal oscillator. 17. The system of claim 10, wherein the processor electronics included in the external controller are further configured to perform operations comprising: storing the transmission frequency of the transmitted signal as the initial value before initiating a charging operation. 18. The system of claim 10, wherein the processor electronics included in the external controller are further configured to perform operations comprising: determining the transmission frequency of the transmitted signal by one or more of measuring pulse-width, determining a time interval between successive rising edges, and counting a number of pulses received within a time period. 19. The system of claim 10, wherein the non-crystal oscillator comprises one of a ring-oscillator and a resistor-capacitor oscillator. 20. A method comprising: providing power to a non-crystal oscillator associated with an implantable electronic device; detecting an output frequency associated with the non-crystal oscillator; comparing the detected output frequency with a stored output frequency value associated with the non-crystal oscillator to detect an output frequency shift; and determining a change in temperature of the implantable electronic device based on the detected output frequency shift. 21. The method of claim 20, further comprising: adjusting a field strength associated with a charging field based on the determined change in temperature. 22. The method of claim 20, further comprising: factoring out of the detected output frequency shift a component that corresponds to one or more of (i) aging of the implantable electronic device and (ii) a change in a rechargeable power source voltage associated with the implantable electronic device. 23. The method of claim 20, wherein the output frequency associated with the non-crystal oscillator comprises a center frequency.