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Portable device with power monitoring to signal battery replacement prior to a voltage supervisor response

  • US 10,267,865 B2
  • Filed: 03/04/2016
  • Issued: 04/23/2019
  • Est. Priority Date: 09/10/2009
  • Status: Active Grant
First Claim
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1. A method for monitoring power in a portable device to permit battery replacement before a voltage supervisor of the portable device responds when a processor supply voltage (VDD) of a processor of the portable device drops to a predetermined response voltage level which is above a reset voltage level of the processor, said method comprising:

  • testing, during operation of the portable device, a power source voltage (Vbat) of a battery of the portable device with a testing interval; and

    providing a favorable warning on the portable device if the testing of the power source voltage (Vbat) of battery indicates that the battery is approaching an end of its lifetime and if, at the same time of testing, a voltage level of an output voltage of a voltage converter of the portable device is maintained, said favorable warning indicating that time still remains for battery replacement prior to a response of the voltage supervisor.

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