TI-BQ2085: 高精度锂离子电池管理芯片，集成AFE与低功耗CPU
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TI-BQ2085-V1P3是一款高度集成的锂离子和锂聚合物电池管理系统(BMS)解决方案，专为需要精确测量电池状态和性能的应用设计。这款产品的主要特点包括：
1. **精确的电池电量测量**：该BMS采用高精度的16位积分转换器，能提供优于3 nVh分辨率的测量，确保了电池充电量的准确度。同时，它具备自我校准功能，使得误差控制在极低的1 µV以下。
2. **符合Smart Battery Specification (SBS)**：支持SBS V1.1标准，这表明其能够与市场上其他智能电池设备兼容，便于系统集成和互操作。
3. **集成时间基**：省去了外部晶体的需求，简化了设计，降低了成本和复杂性。
4. **配合TIbq29311 AFE保护IC**：与TI的bq29311模拟前端集成电路协同工作，为10.8 V或14.4 V的电池包提供完整的电子保护解决方案，只需少量外围组件即可实现全面管理。
5. **低功耗RISC CPU核心和高性能外围设备**：基于强大的CPU，拥有高效的处理能力，能够处理复杂的电池管理和监测任务，同时集成的Flash内存消除了外部配置EEPROM的必要性。
6. **可编程细胞建模**：允许用户根据特定电池类型定制模型，以最大限度地提高电池燃料 gauge（电量估计）的准确性。
7. **驱动LED显示器**：支持3、4或5段LED显示，实时显示电池剩余容量，便于用户直观了解电池状况。
8. **小巧封装**：38针TSSOP(DBT)封装，适合紧凑型设计，特别适用于笔记本电脑、医疗设备和便携式仪器等应用领域。
TI-BQ2085-V1P3是一款集成了众多先进功能的高效BMS，它不仅提供了可靠的电池健康监控，还通过其集成性和易用性简化了系统设计过程，是现代电子设备中不可或缺的电池管理解决方案。
SLUS598 − FEBRUARY 2004
www.ti.com
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RemainingCapacity( ) (RM)
RM represents the remaining capacity in the battery. The bq2085−V1P3 computes RM in units of either mAh
or 10 mWh depending on the selected mode. See Battery Mode( ) (0x03) for units configuration.
RM counts up during charge to a maximum value of FCC and down during discharge and self-discharge to a
minimum of 0. In addition to charge and self-discharge compensation, the bq2085−V1P3 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)
DC is the user-specified battery full capacity. It is calculated from Pack Capacity DF 0x31-0x32 and is
represented in units of 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 units of either mAh or 10 mWh,
depending on the selected mode. On initialization, the bq2085−V1P3 sets FCC to the value stored in Last
Measured Discharge DF 0x35-0x36. During subsequent discharges, the bq2085−V1P3 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 bq2085−V1P3 writes the new
FCC value to data flash 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 counts discharge activity, battery load
estimation, and self-discharge increment. The bq2085−V1P3 initializes DCR, at the beginning of a discharge,
to FCC − RM when RM is within the programmed value in Near Full DF 0x2f. The DCR initial value of FCC −
RM is reduced by FCC/128 if SC = 1 (bit 5 in Gauge Configuration) and is not reduced if SC = 0. DCR stops
counting when the battery voltage reaches the EDV2 threshold on discharge.
Capacity Learning (FCC Update) and Qualified Discharge
The bq2085−V1P3 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:
FCC (new) + DCR (final) + DCR (initial) ) Measured Discharge to EDV2 ) (FCC Battery Low%)
Battery Low % = (value stored in DF 0x2e) ÷ 2.56
A qualified discharge occurs if the battery discharges from RM ≥ FCC − Near Full to the EDV2 voltage threshold
with the following conditions:
D No valid charge activity occurs during the discharge period. A valid charge is defined as a charge of 10 mAh into
the battery.
D No more than 256 mAh of self-discharge or battery load estimation occurs during the discharge period.
D The temperature does not drop below the low temperature thresholds programmed in Learning Low Temp DF
0x9b during the discharge period.
D The battery voltage reaches the EDV2 threshold during the discharge period and the voltage is greater than or
equal to the EDV2 threshold minus 256 mV when the bq2085−V1P3 detected EDV2.
D No midrange voltage correction occurs during the discharge period.
D Current remains ≥ 3C/32 when EDV2 or Battery Low % level is reached.
D No overload condition exists when EDV2 threshold is reached or if RM( ) has dropped to Battery Low%
*
FCC.
The bq2085−V1P3 sets VDQ=1 in pack status when qualified discharge begins. The bq2085−V1P3 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 bq2085−V1P3 saves the new FCC value to the data
flash within 4 seconds of being updated.
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