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BQ27500DRZT-V100 Datasheet(PDF) 31 Page - Texas Instruments |
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BQ27500DRZT-V100 Datasheet(HTML) 31 Page - Texas Instruments |
31 / 39 page 6 APPLICATION-SPECIFIC INFORMATION 6.1 BATTERY PROFILE STORAGE AND SELECTION 6.1.1 Common Profile Aspects 6.1.2 Activities Upon Pack Insertion 6.1.2.1 First OCV and Impedance Measurement 6.1.3 Reading Application Status 6.2 APPLICATION-SPECIFIC FLOW AND CONTROL 6.2.1 Simple Battery (bq27500 Only) bq27500 bq27501 System-Side Impedance Track™ Fuel Gauge www.ti.com SLUS785D – SEPTEMBER 2007 – REVISED APRIL 2008 When a battery pack is removed from host equipment that implements the bq27500/01, the fuel gauge maintains some of the battery information in case the battery is re-inserted. This way, the Impedance Track™ algorithm has a means of recovering battery-status information, thereby maintaining good state-of-charge (SOC) estimates. Two default battery profiles are available to store battery information. They are used to provide the Impedance Track™ algorithm with the default information on two possible battery types expected to be used with the end-equipment. These default profiles can be used to support batteries of different chemistry, same chemistry but different capacities, or same chemistry but different models. Default profiles are programmed by the end-equipment manufacturer. Note that in the case of bq27500, only one of the default profiles can be selected, and this selection cannot be changed during end-equipment operation. In addition to the default profiles, the bq27500/01 maintains two abbreviated profiles. These tables hold dynamic battery data, and keep track of the status for up to two of the most recent batteries used. In most cases, the bq27500/01 can manage the information on two removable battery packs. At power up, the BAT_GD pin is inactive, so that the host cannot obtain power from the battery (this depends on the actual implementation). In this state, the battery is put in an open-circuit condition. Next, the bq27500/1 measures its first open-circuit voltage (OCV) via the BAT pin. From the OCV(SOC) table, the SOC of the inserted battery is found. Then the BAT_GD pin is made active, and the impedance of the inserted battery is calculated from the measured voltage and the load current: Z(SOC) = [OCV(SOC) – V] / I. This impedance is compared with the impedance of the dynamic profiles, Packn, and the default profiles, Defn, for the same SOC (the letter n depicts either a 0 or 1). The Application Status data flash location contains cell profile status information, and can be read using the ApplicationStatus( ) extended command (0x6a). The bit configuration of this function/location is shown in Table 6-1. Table 6-1. ApplicationStatus( ) Bit Definitions. Application bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 Configuration Byte — — — — — — UNSUPBAT LU_ PROF UNSUPBAT = Flag indicating inserted battery is not supported in the current cell profiles. bq27501 only. True when set. Default is 0. LU_PROF = Last profile used by fuel gauge. Pack0 last used when cleared. Pack1 last used when set. Default is 0. The bq27500 supports only one type of battery profile. This profile is stored in both the Def0 and Def1 profiles. When a battery pack is inserted for the first time, the default profile is copied into the Packn profiles. Then the Impedance Track™ algorithm begins fuel gauging, regularly updating Packn as the battery is used. When an existing pack is removed from the bq27500 and a different (or same) pack is inserted, cell impedance is measured immediately after battery detection (see Section 6.1.2.1, First OCV and Submit Documentation Feedback APPLICATION-SPECIFIC INFORMATION 31 |
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