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BQ2060A-E619DBQR Datasheet(PDF) 9 Page - Texas Instruments |
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BQ2060A-E619DBQR Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 46 page  below the digital filter. First, the bq2060A can decrement RM and DCR at a rate determined by the value stored in Light Discharge Current EE 0x2b when it detects no dis- charge activity and the SMBC and SMBD lines are high. Light Discharge Current has a range of 44 µA to 11.2mA. Alternatively, the bq2060A can be configured to disable the digital filter for discharge when the SMBC and SMBD lines are high. In this way, the digital filter will not mask the leakage current signal. The bq2060A is configured in this mode by setting the NDF bit in Con- trol Mode. Midrange Capacity Corrections The bq2060A applies midrange capacity corrections when the VCOR bit is set in Pack Configuration. The bq2060A adjusts RM to the associated percentage at three different voltage levels VOC25, VOC50, and VOC75. The VOC values represent the open circuit bat- tery voltage at which RM corresponds to the associated state of charge for each threshold. Threshold Associated State of Charge VOC25 25% VOC50 50% VOC75 75% For the midrange corrections to occur, the temperature must be in the range of 19 °Cto31°C inclusive and the Current() and AverageCurrent() must both be between –64mA and 0. For a correction to occur, the bq2060A must also detect the need for correction during two adja- cent measurements separated by 20s. The second mea- surement is not required if the first measurement is im- mediately after a device reset. The bq2060A makes midrange corrections as shown in Table 5. Charge Control Charging Voltage and Current Broadcasts The bq2060A supports SBS charge control by broadcasting the ChargingCurrent() and ChargingVoltage() to the Smart Charger address. The bq2060A broadcasts the re- quests every 10s. The bq2060A updates the values used in the charging current and voltage broadcasts based on the battery’s state of charge, voltage, and temperature. The fast-charge rate is programmed in Fast-Charging Current EE 0x1a - 0x1b while the charge voltage is pro- grammed in Charging Voltage EE 0x0a-0x0b. The bq2060A internal charge control is compatible with popular rechargeable chemistries. The primary charge-termination techniques include a change in tem- perature over a change in time ( ∆T/∆t) and current taper, for nickel-based and Li-Ion chemistries, respec- tively. The bq2060A also provides pre-charge qualifica- tion and a number of safety charge suspensions based on current, voltage, temperature, and state of charge. 9 Condition Result Voltage() ≥ VOC75 and RelativeStateOfCharge() ≤ 63% RelativeStateOfCharge() →75% < VOC75 and RelativeStateOfCharge() ≥ 87% RelativeStateOfCharge() →75% ≥VOC50 and RelativeStateOfCharge() ≤ 38% RelativeStateOfCharge() →50% <VOC50 and RelativeStateOfCharge() ≥ 62% RelativeStateOfCharge() →50% ≥ VOC25 and RelativeStateOfCharge() ≤ 13% RelativeStateOfCharge() →25% < VOC25 and RelativeStateOfCharge() ≥ 37% RelativeStateOfCharge() →25% Table 5. Midrange Corrections bq2060A Figure 3. Self-Discharge at 2.5%/Day @25C |
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