Abstract: A portable electronic device includes a functional section that operates in first and second modes, a current measurement section that measures a current supplied to the functional section, and an abnormality detection section that confirms the current in a first cycle, a second cycle, or a third cycle, and detects current abnormality. When the functional section operates in the first mode, the abnormality detection section confirms the current in the first cycle, next, when the functional section is switched from the first mode to the second mode, the abnormality detection section confirms the current in the second cycle, and when the abnormality detection section does not detect the current abnormality for a predetermined period after the mode has been switched, the abnormality detection section confirms the current in the third cycle.

Abstract: An electronic device includes a plurality of connectors, each of which is configured to couple to a different external power supply unit, a battery, a memory configured to store information indicating which of the plurality of connectors may be used to charge the battery, a primary controller configured to select a connector from among connectors which are currently connecting with respective external power supply units based on the stored information, a secondary controller configured to select a connector from among connectors which are currently connecting with respective external power supply units, and a switching portion. The switching portion is configured to couple the battery to the connector selected by the secondary controller when the primary controller is deactivated and to couple the battery to the connector selected by the primary controller when the primary controller is activated.

Abstract: A challenge to be met by an aspect of the present invention is to provide a charge control circuit that prevents occurrence of a decrease in battery capacity even when a battery stays in a connection with an external power supply and that induces neither battery deterioration nor overcharge. A first switch (2) is connected to a point among an external power supply (60), a load (80), and a secondary battery (70). When the secondary battery (70) is charged with the external power supply (60), the first switch (2) is turned on. When the secondary battery (70) has accomplished full charge, the first switch 82) is turned off. Electric discharge from the secondary battery (70) to the load (80) is shut off at full charge of the secondary battery (70), so that a load current fed from the secondary battery (70) does not flow and, hence, a decrease in battery capacity of the secondary battery (70) which would be caused by the load (80) does not take place.

Abstract: Provided is a current detector which can accurately determine whether or not a transmission current is abnormal in the TDMA system. The sampling is performed on two frames in a regular manner. It is determined that the transmission current (I) is abnormal when the transmission current (I) is detected in all of the 16 slots within the two frames. If it is determined that the transmission current (I) is normal when the transmission current (I) is not detected in anyone of slots. Further, the determination result is decided when the error determination results coincide for N consecutive times. This makes it possible to accurately determine the presence/absence of an abnormality of a transmitting current in the TDMA system.

Abstract: A problem of the invention is to provide a non-contact communication device capable of conducting non-contact communication even when a control section cannot be operated a drop in a battery voltage or a reset. A memory element (15) for storing resonance frequency adjustment data and communication condition data, and a setting register (2) capable of temporarily holding the resonance frequency adjustment data and the communication condition data from the memory element (15) to the setting register (2) before a reset by a CPU (17). When the CPU (17) is reset by a CPU reset signal, the resonance frequency adjusting data downloaded to the setting register (2) are used to adjust the resonance frequency of an antenna circuit. Thus, non-contact communication can be performed even when the CPU cannot operate because of a drop in the battery voltage or a reset.

Abstract: The present invention provides an electronic equipment capable of supplying an electric power to a secondary battery only when the secondary battery must be charged.