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。

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SLUS598 − FEBRUARY 2004

www.ti.com

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.

(1)



SLUS598 − FEBRUARY 2004

www.ti.com

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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