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BQ2084-V140 Datasheet(PDF) 11 Page - Texas Instruments |
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BQ2084-V140 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 64 page  www.ti.com End-of-Discharge Thresholds and Capacity Correction EDV Thresholds and Near-Full Programming bq2084-V140 SLUS664B – JULY 2005 – REVISED AUGUST 2006 • Current remains ≤ 3C/32 when EDV2 or Battery Low % level is reached. • No overload condition exists when EDV2 threshold is reached, or if RM() has dropped to Battery Low% x FCC, • No valid charge activity occurs during the discharge period. A valid charge is defined as an uninterrupted charge of 10 mAh into the battery. The bq2084-V140 sets VDQ = 1 in PackStatus() when qualified discharge begins. The bq2084-V140 sets VDQ = 0 if any disqualifying condition occurs. FCC cannot be reduced by more than 256 mAh or increased by more than 512 mAh during any single update cycle. The bq2084-V140 saves the new FCC value to the data flash within 4 seconds of being updated. The bq2084-V140 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 bq2084-V140 for overall voltage or single-cell EDV thresholds. If programmed for single-cell EDV determination, the bq2084-V140 determines EDV on the basis of the lowest single-cell voltage. Fixed EDV thresholds must be programmed in EMF/EDV0 DF 0x95-0x96, EDV C0 Factor/EDV1 DF 0x97-0x98, and EDV R Factor/EDV2 DF 0x99-0x9a. If the CEDV bit in Gauge Configuration DF 0x29 is set, automatic compensated EDVs are enabled and the bq2084-V140 computes the EDV0, EDV1, and EDV2 voltage thresholds based on the values in DF 0x95-0xa0 and the battery's current discharge rate and temperature. If FEDV0 in Gauge Configuration is also set then EDV0 is not compensated. The bq2084-V140 disables EDV detection if Current( ) exceeds the Overload Current threshold programmed in DF 0x5b-DF 0x5c. The bq2084-V140 resumes EDV threshold detection after Current( ) drops below the Overload Current threshold. Any EDV threshold detected is reset after charge is detected and VDQ is cleared after 10 mAh of charge. The bq2084-V140 uses the EDV thresholds to apply voltage-based corrections to the RM register according to Table 2. Table 2. State-of-Charge Based on Low Battery Voltage THRESHOLD RELATIVE STATE OF CHARGE EDV0 0% EDV1 3% EDV2 Battery Low % The bq2084-V140 performs EDV-based RM adjustments with Current() ≤ C/32. No EDV flags are set if current < C/32. The bq2084-V140 adjusts RM as it detects each threshold. If the voltage threshold is reached before the corresponding capacity on discharge, the bq2084-V140 reduces RM to the appropriate amount as shown in Table 2. If an RM % level is reached on discharge before the voltage reaches the corresponding threshold, then RM is held at that % level until the threshold is reached. RM is only held if VDQ = 1, indicating a valid learning cycle is in progress. If Battery Low % is set to zero, EDV1 and EDV0 corrections are disabled. The bq2084-V140 uses the values stored in data flash for the EDV0, EDV1, and EDV2 values or calculates the three thresholds from a base value and the temperature, capacity, and rate adjustment factors stored in data flash. If EDV compensation is disabled, then EDV0, EDV1, and EDV2 are stored directly in mV in DF 0x95-0x96, DF 0x97-0x98, and DF 0x99-0x9a, respectively. For capacity correction at EDV2, Battery Low % DF 0x2f can be set at a desired state-of-charge, STATEOFCHARGE%, in the range of 3-19%. Typical values for STATEOFCHARGE% are 5-7%, representing 5-7% capacity. Battery Low % = (STATEOFCHARGE% x 2.56) 11 Submit Documentation Feedback |
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