bq30z554-R1

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SLUSBD4 – OCTOBER 2013

Charge Control Features

The bq30z554-R1 Charge Control features include:

•

Supports JEITA temperature ranges T1, T2, T3, T4, T5, T6. Reports charging voltage and charging current,

according to the active temperature range.

•

Handles more complex charging profiles. Allows for splitting the standard temperature range into two sub-

ranges, and allows for varying the charging current according to the cell voltage.

•

Reports the appropriate charging current needed for constant current charging and the appropriate charging

voltage needed for constant voltage charging to a smart charger using SMBus broadcasts.

•

Determines the chemical state of charge of each battery cell using Impedance Track and can reduce the

charge difference of the battery cells in a fully charged state of the battery pack, gradually using the cell

balancing algorithm during rest and charging. This prevents fully charged cells from overcharging and causing

excessive degradation, and also increases the usable pack energy by preventing premature charge

termination.

•

Supports precharging/zero-volt charging

•

Supports charge inhibit and charge suspend if the battery pack temperature is out of temperature range.

•

Reports charging fault and also indicates charge status via charge and discharge alarms.

Gas Gauging

The bq30z554-R1 uses the Impedance Track technology to measure and calculate the available charge in

battery cells. The achievable accuracy is better than 1% error over the lifetime of the battery and there is no full

charge or discharge learning cycle required. See the Theory and Implementation of Impedance Track Battery

Fuel-Gauging Algorithm application report (SLUA364B) for further details.

Lifetime Data Logging Features

The bq30z554-R1 offers extended lifetime data logging where important measurements are stored for warranty

and analysis purposes. The data monitored includes lifetime:

•

Maximum cell voltage cell0, cell1, cell2, cell3

•

Minimum cell voltage cell0, cell1, cell2, cell3

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Maximum cell voltage delta

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Maximum charge and discharge current

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Maximum average discharge current

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Maximum average discharge power

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Maximum cell temperature

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Minimum cell temperature

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Maximum cell temperature delta

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Maximum device temperature

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Minimum device temperature

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Maximum FET temperature

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Total accumulated safety events and last safety event in term of charging cycle

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Total accumulated charging events and charging events

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Total accumulated gauging events and gauging events

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Total accumulated cell balancing time cell0, cell1, cell2, cell3

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Total device firmware runtime

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Accumulated runtime in JEITA undertemperature range

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Accumulated runtime in JEITA low temperature range

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Accumulated runtime in JEITA standard temperature range

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Accumulated runtime in JEITA recommended temperature range

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Accumulated runtime in JEITA high temperature range

•

Accumulated runtime in JEITA overtemperature range

Copyright © 2013, Texas Instruments Incorporated

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