Method for an electronic device to detect the presence of a battery charger
First Claim
1. A method, for an electronic device powered by a battery, for detecting a presence of a battery charger, the battery having a memory device disposed therein coupled to a data line, a voltage level on the data line having a first level and a second level, the voltage level normally being at the first level, the method comprising the steps of:
- connecting the battery to the electronic device, including connecting the data line of the battery to the electronic device;
connecting the battery to the battery charger, performed after the step of connecting, while the electronic device is still connected to the battery;
detecting the battery by the charger;
reading the memory device over the data line, performed by the charger after the step of connecting the battery to the battery charger;
holding the voltage level of the data line at the second level; and
detecting the voltage level of the data line being at the second level by the electronic device.
2 Assignments
0 Petitions
Accused Products
Abstract
A battery (104) is connected to a host device (106), the host device is an electrical or electronic device, such as a cellular telephone. The battery is rechargeable, and contains a memory (110) connected to a data line (116). The battery is connected to a battery charger (102) while also connected to the host device. The battery charger detects the battery (306), reads the battery information (308) from the battery memory. The data line is common to the battery charger, battery, and host device. The charger indicates its presence to the host device by changing the voltage level on the data line (310) from a normal first level, such as a logic level of one, to a second level, such as a logic level of zero, and holds the data line at the second level. The host detects the presence of the battery charger (312) after the data line has been held at the second level for a sufficient period of time, and then may take the desired actions (314).
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Citations
13 Claims
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1. A method, for an electronic device powered by a battery, for detecting a presence of a battery charger, the battery having a memory device disposed therein coupled to a data line, a voltage level on the data line having a first level and a second level, the voltage level normally being at the first level, the method comprising the steps of:
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connecting the battery to the electronic device, including connecting the data line of the battery to the electronic device; connecting the battery to the battery charger, performed after the step of connecting, while the electronic device is still connected to the battery; detecting the battery by the charger; reading the memory device over the data line, performed by the charger after the step of connecting the battery to the battery charger; holding the voltage level of the data line at the second level; and detecting the voltage level of the data line being at the second level by the electronic device. - View Dependent Claims (2, 3, 4, 5)
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6. A method for an electronic device connected to a battery to detect a presence of a battery charger, the method comprising:
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connecting the battery to the battery charger; detecting a voltage level change on a thermistor line of the battery charger; applying a charge current to the battery, performed by the battery charger after performing the step of detecting; reading a memory device disposed in the battery over a data line, performed by the battery charger after performing the step of detecting; holding a voltage level of the data line at a logic level of zero; and detecting the voltage level being at the logic level of zero, performed by the electronic device. - View Dependent Claims (7, 8)
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9. A method for a host device having a battery connected thereto to detect a presence of a battery charger, the battery having a memory device disposed therein connected to a data line, the electrical device connected to the data line, the data line having a first level and a second level, the method comprising the steps of:
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detecting the battery, by the battery charger; reading the memory device, by the battery charger, over the data line; loading the data line so that the data line changes from the first level to the second level; holding the data line at the second level, by the battery charger; and detecting the holding of the data line at the second level, by the host device. - View Dependent Claims (10, 11, 12, 13)
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Specification