Method and apparatus for battery power pre-check at system power-on
First Claim
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1. A battery check circuit comprising:
- a latch circuit to latch power from a first battery upon receiving an enabling signal; and
a test circuit to receive power from the first battery via the latch circuit, the test circuit to test a charge level of a second battery and, if the charge level is less than a predetermined charge level, to assert a shutdown signal prior to allowing power from the second battery to be applied to a system.
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Abstract
A system including at least one electronic component and a battery check circuit. When a power consumption level of the at least one electronic component is increased, the battery check circuit determines whether to provide power from a battery to the at least one electronic component by comparing a power level of the battery to a first power level.
41 Citations
9 Claims
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1. A battery check circuit comprising:
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a latch circuit to latch power from a first battery upon receiving an enabling signal; and
a test circuit to receive power from the first battery via the latch circuit, the test circuit to test a charge level of a second battery and, if the charge level is less than a predetermined charge level, to assert a shutdown signal prior to allowing power from the second battery to be applied to a system. - View Dependent Claims (2, 3)
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4. An apparatus comprising:
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a latch having a delay circuit coupled to a preset input to set the latch to a first value as a voltage is applied to the latch on a first supply line;
a first gate having a control input to enable the first gate in response to a push button switch being closed or in response to the latch storing the first value, the first gate being disabled when the latch stores a second value and the push button switch is open;
a first battery switchably coupled to the first supply line by the first gate when the first gate is enabled;
a second battery; and
a controller to test a charge level of the second battery and, if the charge level of the second battery is less than a predetermined charge level, to reset the latch to the second value to prevent the second battery from powering a system. - View Dependent Claims (5, 6, 7, 8)
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9. A portable computing device comprising:
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a processor;
a memory;
a first bridge component coupling said processor to said memory;
an I/O device;
a second bridge component coupling said processor to said I/O device;
a first battery to power said processor, said memory, said first bridge component, said I/O device, and said second bridge component, the first battery being a smart battery capable of communicating a charge level of said first battery;
a switch to be actuated by a user to enable said portable computing device to cause said processor to execute programs from said memory;
a battery power precheck circuit to, in response to actuation of said switch, communicate with said first battery to determine if the charge level of the first battery exceeds a selected threshold, and to prevent power from the first battery from being applied to said processor, said memory, said first bridge component, said I/O device, and said second bridge component if the charge level does not exceed said selected threshold, but to apply power from the first battery to said processor, said memory, said first bridge component, said I/O device, and said second bridge component if the charge level of the first battery exceeds the selected threshold.
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Specification