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BQ2085-V1P3 Datasheet(PDF) 11 Page - Texas Instruments |
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BQ2085-V1P3 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 57 page  bq2085-V1P3 SLUS598 − FEBRUARY 2004 www.ti.com 11 End-of-Discharge Thresholds and Capacity Correction The bq2085−V1P3 monitors the battery for three low-voltage thresholds, EDV0, EDV1, and EDV2. The EDV thresholds can be programmed for determination based on the overall pack voltage or an individual cell level. The EDVV bit in Pack Configuration DF 0x28 configures the bq2085−V1P3 for overall voltage or single-cell EDV thresholds. If programmed for single-cell EDV determination, the bq2085−V1P3 determines EDV on the basis of the lowest single-cell voltage. Fixed EDV thresholds can be programmed in EMF/EDV0 DF 0x84-0x85, EDV C0 Factor/EDV1 DF 0x86-0x87, and EDV R Factor/EDV2 DF 0x88-0x89. If the CEDV bit in Gauge Configuration DF 0x29 is set, automatic EDV compensation is enabled and the bq2085−V1P3 computes the EDV0, EDV1, and EDV2 thresholds based on the values in DF 0x84-0x8d and the battery’s current discharge rate and temperature. The bq2085−V1P3 disables EDV detection if Current( ) exceeds the Overload Current threshold programmed in DF 0x58 − DF 0x59. The bq2085−V1P3 resumes EDV threshold detection after Current( ) drops below the Overload Current threshold. Any EDV threshold detected is reset after charge is applied and VDQ is cleared after 10mAh of charge. Table 2. State of Charge Based on Low Battery Voltage THRESHOLD RELATIVE STATE OF CHARGE EDV0 0% EDV1 3% EDV2 Battery Low % The bq2085−V1P3 uses the EDV thresholds to apply voltage-based corrections to the RM register according to Table 1. The bq2085−V1P3 performs EDV-based RM adjustments with Current( ) ≥ C/32. No EDVs are set if current < C/32. The bq2085−V1P3 adjusts RM as it detects each threshold. If the voltage threshold is reached before the corresponding capacity on discharge, the bq2085−V1P3 reduces RM to the appropriate amount as shown in Table 2. This reduction occurs only if current ≥ C/32 when the EDV threshold is detected. If RM reaches the capacity level before the voltage threshold is reached on discharge, the bq2085−V1P3 prevents RM from decreasing further until the battery voltage reaches the corresponding threshold only on a full learning cycle discharge. RM is not held at the associated EDV percentage on a nonlearning discharge cycle (VDQ=0) or if current < C/32. If Battery Low % is set to zero, EDV1 and EDV0 corrections are disabled. Table 3. bq2085−V1P3 Register Functions FUNCTION COMMAND CODE ACCESS UNITS ManufacturerAccess 0x00 read/write NA RemainingCapacityAlarm 0x01 read/write mAh, 10 mWh RemainingTimeAlarm 0x02 read/write minutes BatteryMode 0x03 read/write NA AtRate 0x04 read/write mA, 10mW AtRateTimeToFull 0x05 read minutes AtRateTimeToEmpty 0x06 read minutes AtRateOK 0x07 read Boolean Temperature 0x08 read 0.1 °K Voltage 0x09 read mV Current 0x0a read mA AverageCurrent 0x0b read mA MaxError 0x0c read percent RelativeStateOfCharge 0x0d read percent AbsoluteStateOfCharge 0x0e read percent RemainingCapacity 0x0f read mAh, 10 mWh |
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