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BQ2060SS-E411 Datasheet(PDF) 9 Page - Texas Instruments |
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BQ2060SS-E411 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 59 page  www.ti.com Main Gas Gauge Registers FCC(new) + DCR(final) + ) (FCCxBatteryLow%) DCR(initial) ) measureddischarge to EDV2 (1) bq2060 SLUS035E – JANUARY 2000 – REVISED OCTOBER 2005 The main counter RemainingCapacity() (RM) represents the available capacity or energy in the battery at any given time. The bq2060 adjusts RM for charge, self-discharge, and leakage compensation factors. The information in the RM register is accessible through the communications ports and is also represented through the LED display. The FullChargeCapacity() (FCC) register represents the last measured full discharge of the battery. It is used for the battery’s full-charge reference for relative capacity indication. The bq2060 updates FCC when the battery undergoes a qualified discharge from nearly full to a low battery level. FCC is accessible through the serial communications ports. The Discharge Count Register (DCR) is a non-accessible register that only tracks discharge of the battery. The bq2060 uses the DCR register to update the FCC register if the battery undergoes a qualified discharge from nearly full to a low battery level. In this way, the bq2060 learns the true discharge capacity of the battery under system-use conditions. RemainingCapacity() (RM) RM represents the remaining capacity in the battery. The bq2060 computes RM in either mAh or 10 mWh depending on the selected mode. On initialization, the bq2060 sets RM to 0. RM counts up during charge to a maximum value of FCC and down during discharge and self-discharge to 0. In addition to charge and self-discharge compensation, the bq2060 calibrates RM at three low-battery-voltage thresholds, EDV2, EDV1, and EDV0 and three programmable midrange thresholds VOC25, VOC50, and VOC75. This provides a voltage-based calibration to the RM counter. DesignCapacity() (DC) The DC is the user-specified battery full capacity. It is calculated from Pack Capacity EE 0x3a–0x3b and is represented in mAh or 10 mWh. It also represents the full-battery reference for the absolute display mode. FullChargeCapacity() (FCC) FCC is the last measured discharge capacity of the battery. It is represented in either mAh or 10 mWh depending on the selected mode. On initialization, the bq2060 sets FCC to the value stored in Last Measured Discharge EE 0x38–0x39. During subsequent discharges, the bq2060 updates FCC with the last measured discharge capacity of the battery. The last measured discharge of the battery is based on the value in the DCR register after a qualified discharge occurs. Once updated, the bq2060 writes the new FCC value to EEPROM in mAh to Last Measured Discharge. FCC represents the full-battery reference for the relative display mode and relative state of charge calculations. Discharge Count Register (DCR) The DCR register counts up during discharge, independent of RM. DCR can continue to count even after RM has counted down to 0. Prior to RM = 0, discharge activity, light discharge estimation and self-discharge increment DCR. After RM = 0, only discharge activity increments DCR. The bq2060 initializes DCR to FCC – RM when RM is within twice the programmed value in Near Full EE 0x55. The DCR initial value of FCC – RM is reduced by FCC/128 if SC = 0 (bit 2 in Control Mode) and is not reduced if SC = 1. DCR stops counting when the battery voltage reaches the EDV2 threshold on discharge. Capacity Learning (FCC Update) And Qualified Discharge The bq2060 updates FCC with an amount based on the value in DCR if a qualified discharge occurs. The new value for FCC equals the DCR value plus the programmable nearly full- and low-battery levels, according to the following equation: where: BatteryLow% = (value stored in EE 0x54) ÷ 2.56 9 |
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