Method for controlling a power supply in an external terminal connection of a personal data assistant
First Claim
1. A power management method for a personal digital assistant which can be connected with an external communication terminal, comprising the steps of:
- upon detecting power-on of said external communication terminal, detecting a battery voltage of said personal digital assistant;
comparing said battery voltage with a reference voltage, said reference voltage being slightly higher than an inoperable voltage of said personal digital assistant;
generating a low-voltage alarm message when said battery voltage is lower than said reference voltage; and
supplying electric power to said external communication terminal, if said battery voltage is higher than said reference voltage.
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Abstract
A power management method for a PDA (personal digital assistant) which can be connected with an external communication terminal is described. Upon detecting power-on of the external communication terminal, the PDA detects a battery voltage of the PDA and compares the battery voltage with a reference voltage which is slightly higher than an inoperable voltage of the PDA. If the battery voltage is lower than the reference voltage, the PDA generates a low-voltage alarm message. Otherwise, if the battery voltage is higher than the reference voltage, the PDA supplies electric power to the external communication terminal.
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Citations
9 Claims
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1. A power management method for a personal digital assistant which can be connected with an external communication terminal, comprising the steps of:
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upon detecting power-on of said external communication terminal, detecting a battery voltage of said personal digital assistant; comparing said battery voltage with a reference voltage, said reference voltage being slightly higher than an inoperable voltage of said personal digital assistant; generating a low-voltage alarm message when said battery voltage is lower than said reference voltage; and supplying electric power to said external communication terminal, if said battery voltage is higher than said reference voltage. - View Dependent Claims (2, 3, 4)
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5. A power management method for a personal digital assistant which can be connected with an external communication terminal, comprising the steps of:
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upon detecting power-on of said external communication terminal, detecting a battery voltage of said personal digital assistant; comparing said battery voltage with a reference voltage, said reference voltage being slightly higher than an inoperable voltage of said personal digital assistant; generating a low-voltage alarm message when said battery voltage is lower than said reference voltage; supplying electric power to said external communication terminal if said battery voltage is higher than said reference voltage, comparing said battery voltage with an inoperable voltage threshold of said personal digital assistant; and setting the personal digital assistant to a sleep mode when said battery voltage is lower than said inoperable voltage threshold of said personal digital assistant.
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6. A power management method for a personal digital assistant which can be connected with an external communication terminal, comprising the steps of:
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upon detecting power-on of said external communication terminal, detecting a battery supply ability of said personal digital assistant; calculating a difference between said battery supply ability and a power consumption of said external communication terminal; comparing said difference with an inoperable threshold value at which said personal digital assistant cannot operate normally; providing electric power to said external communication terminal when said difference is higher than said inoperable threshold value. - View Dependent Claims (7, 8, 9)
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Specification