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BQ2010 Datasheet(PDF) 5 Page - Texas Instruments |
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BQ2010 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 20 page  Gas Gauge Operation The operational overview diagram in Figure 2 illustrates the operation of the bq2010. The bq2010 accumulates a measure of charge and discharge currents, as well as an estimation of self-discharge. Charge and discharge cur- rents are temperature and rate compensated, whereas self-discharge is only temperature compensated. The main counter, Nominal Available Charge (NAC), represents the available battery capacity at any given time. Battery charging increments the NAC register, while battery discharging and self-discharge decrement the NAC register and increment the DCR (Discharge Count Register). The Discharge Count Register (DCR) is used to update the Last Measured Discharge (LMD) register only if a complete battery discharge from full to empty occurs without any partial battery charges. Therefore, the bq2010 adapts its capacity determination based on the actual conditions of discharge. The battery's initial capacity is equal to the Programmed Full Count (PFC) shown in Table 2. Until LMD is updated, NAC counts up to but not beyond this threshold during subsequent charges. This approach allows the gas gauge to be charger-independent and compatible with any type of charge regime. 1. Last Measured Discharge (LMD) or learned battery capacity: LMD is the last measured discharge capacity of the battery. On initialization (application of VCC or bat- tery replacement), LMD = PFC. During subsequent discharges, the LMD is updated with the latest measured capacity in the Discharge Count Register (DCR) representing a discharge from full to below EDV1. A qualified discharge is necessary for a ca- pacity transfer from the DCR to the LMD register. The LMD also serves as the 100% reference thresh- old used by the relative display mode. 2. Programmed Full Count (PFC) or initial bat- tery capacity: The initial LMD and gas gauge rate values are pro- grammed by using PROG1–PROG4. The PFC also provides the 100% reference for the absolute dis- play mode. The bq2010 is configured for a given ap- plication by selecting a PFC value from Table 2. The correct PFC may be determined by multiplying the rated battery capacity in mAh by the sense re- sistor value: Battery capacity (mAh) * sense resistor (Ω) = PFC (mVh) Selecting a PFC slightly less than the rated capac- ity for absolute mode provides capacity above the full reference for much of the battery's life. 5 bq2010 FG201002.eps Rate and Temperature Compensation Temperature Compensation Charge Current Discharge Current Self-Discharge Timer Temperature Translation Nominal Available Charge (NAC) Last Measured Discharged (LMD) Discharge Count Register (DCR) < Qualified Transfer + Rate and Temperature Compensation Rate and Temperature Compensation Temperature Step, Other Data + - - + Inputs Main Counters and Capacity Reference (LMD) Outputs Serial Port Chip-Controlled Available Charge LED Display Figure 2. Operational Overview |
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