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BQ2050 Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
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BQ2050 Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers |
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5 / 21 page  Gas Gauge Operation The operational overview diagram in Figure 2 illustrates the operation of the bq2050. The bq2050 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 Capacity (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 bq2050 adapts its capacity determination based on the actual conditions of discharge. The battery's initial capacity is equal to the Pro- grammed 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 al- lows the gas gauge to be charger-independent and com- patible 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 capac- ity transfer from the DCR to the LMD register. The LMD also serves as the 100% reference threshold used by the relative display mode. 5 bq2050 FG205002.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 Compensated Available Charge LED Display, etc. Figure 2. Operational Overview |
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