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Application Notes/
Technical Brief
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AN667
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Title:
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Smart Battery Charger with SMBus Interface
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Name:
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AN667
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Date:
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8/26/97
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Author:
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Laszlo Kiraly
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Description:
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This application note provides the schematics, software listings, and circuit board layout for a PIC16C73 based Smart Battery Charger. The Demo Board, DC101, is available to selected customers through Linear Technology Corp. product marketing. The DC101 (Figure 1) is the Smart Battery Charger (SBC) portion of a Smart Battery System. A simplified block diagram of a Smart Battery System is shown in Figure 3 (refer to "The Smart Battery Charger Specification," Duracell). The Smart Battery (SB) contains circuitry which provides charging information to the SBC. The SBC
receives this information in terms of ChargingVoltage(), ChargingCurrent(), and AlarmWarning() commands from the SB. The SBC and SB communicate via the System Management Bus (SMB), which is an implementation of the I 2 C bus (refer to "The Smart Management Bus Specification," Intel; and "The I 2 C Bus and How to Use It," Philips Semiconductor). The SBC sets the charging current and voltage based on input from the SB. The SBC charger also has the intelligence to monitor the SB?s thermistor. The thermistor provides temperature information for charge termination, and battery chemistry information.
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Keywords:
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PIC16C73
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