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BQ28Z610-R1

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SLUSE07 – JANUARY 2020

Product Folder Links: BQ28Z610-R1

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Copyright © 2020, Texas Instruments Incorporated

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To protect against cell undervoltage, set the data flash value to 2500 in the Protections: CUV register.

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To set the shutdown voltage to prevent further pack depletion due to low pack voltage, program Power:

Shutdown: Shutdown voltage = 2300.

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To protect against large charging currents when the AC adapter is attached, set the data flash value to 6000

in the Protections: OCC: Threshold register.

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To protect against large discharging currents when heavy loads are attached, set the data flash value to

–6000 in the Protections: OCD: Threshold register.

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Program a short circuit delay timer and threshold setting to enable the operating the system for large short

transient current pulses. These two parameters are under Protections: ASCC: Threshold = 100 for charging

current. The discharge current setting is Protections: ASCD:Threshold = –100 mV.

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To prevent the cells from overcharging and adding a second level of safety, there is a register setting that will

shut down the device if any of the cells voltage measurement is greater than the Safety Over Voltage setting

for greater than the delay time. Set this data flash value to 4500 in Permanent Fail: SOV: Threshold.

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To disable the cell balancing feature, set the data flash value to 0 in Settings: Configuration: Balancing

Configuration: bit 0 (CB).

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To enable the internal temperature and the external temperature sensors: Set Settings:Configuration:

Temperature Enable: Bit 0 (TSInt) = 1 for the internal sensor; set Bit 1 (TS1) = 1 for the external sensor.

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To prevent charging of the battery pack if the temperature falls below 0°C, set Protections: UTC:Threshold

= 0.

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To prevent discharging of the battery pack if the temperature falls below 0°C, set Protections:

UTD:Threshold = 0.

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To provide required information to the smart chargers, the gas gauge must operate in BROADCAST mode.

To enable this, set the [BCAST] bit in Configuration: SBS Configuration 2: Bit 0 [BCAST] = 1.

Each parameter listed for fault trigger thresholds has a delay timer setting associated for any noise filtering.

These values, along with the trigger thresholds for fault detection, may be changed based upon the application

requirements using the data flash settings in the appropriate register stated in the BQ28Z610-R1 Technical

Reference Manual (SLUUC81).

9.2.2.2 Calibration Process

The calibration of current, voltage, and temperature readings is accessible by writing 0xF081 or 0xF082 to

ManufacturerAccess(). A detailed procedure is included in the BQ28Z610-R1 Technical Reference Manual

(SLUUC81) in the Calibration section. The description allows for calibration of cell voltage measurement offset,

battery voltage, pack voltage, current calibration, coulomb counter offset, PCB offset, CC gain/capacity gain, and

temperature measurement for both internal and external sensors.

9.2.2.3 Gauging Data Updates

When a battery pack enabled with the BQ28Z610-R1 device is first cycled, the value of FullChargeCapacity()

updates several times. Figure 23 shows RemainingCapacity() and FullChargeCapacity(), and where those

updates occur. As part of the Impedance Track algorithm, it is expected that FullChargeCapacity() may update at

the end of charge, at the end of discharge, and at rest.