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BQ2084-V143 Datasheet(PDF) 39 Page - Texas Instruments |
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BQ2084-V143 Datasheet(HTML) 39 Page - Texas Instruments |
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39 / 71 page  www.ti.com Voltage() (0x09) Current() (0x0a) AverageCurrent() (0x0b) MaxError() (0x0c) bq2084-V143 SLUS732 – SEPTEMBER 2006 Description: Returns the cell-pack voltage (mV). Purpose: The Voltage() function provides power management systems with an accurate battery terminal voltage. Power management systems can use this voltage, along with battery current information, to characterize devices they control. This ability helps enable intelligent, adaptive power-management systems. SMBus protocol: Read word Output: Unsigned integer—battery terminal voltage in mV. Units: mV Range: 0 to 20,000 mV Granularity: 1 mV Accuracy: ±0.25% (after calibration) Description: Returns the current being supplied (or accepted) by the battery (mA). Purpose: The Current() function provides a snapshot for the power management system of the current flowing into or out of the battery. This information is of particular use in power-management systems because they can characterize individual devices and tune their operation to actual system power behavior. SMBus protocol: Read word Output: Signed integer—charge/discharge rate in mA increments: positive for charge, negative for discharge. Units: mA Range: -32,768 to 32,767 mA Granularity: 1 mA Accuracy: 0.25% or 5 mA, whichever is greater Description: Returns a value that approximates a one-minute rolling average of the current being supplied (or accepted) through the battery terminals (mA). AverageCurrent() is implemented as a single pole IIR filter with a 14.5-s time constant. Purpose: The AverageCurrent() function provides the average current flowing into or out of the battery for the power management system. SMBus protocol: Read word Output: Signed integer—charge/discharge rate in mA increments: positive for charge, negative for discharge. Units: mA Range: -32,768 to 32,767 mA Granularity: 1 mA Accuracy: 0.25% or 5 mA, whichever is greater Description: Returns the expected margin of error (%) in the state of charge calculation. For example, when MaxError() returns 10% and RelativeStateOfCharge() returns 50%, the RelativeStateOfCharge() is more likely between 50% and 60%. The bq2084-V143 sets MaxError() to 100% on a full reset. The bq2084-V143 sets MaxError() to 2% on completion of a learning cycle, unless the bq2084-V143 limits the learning cycle to the +512/-256 mAh maximum adjustment values. If the learning cycle is limited, the bq2084-V143 sets MaxError() to 8% unless MaxError() was already below 8%. In this case, MaxError() does not change. The bq2084-V143 increments MaxError( ) by 1% after four increments of CycleCount() without a learning cycle. If voltage-based corrections are applied to the coulomb counter, MaxError() is set to 25%. 39 Submit Documentation Feedback |
Similar Part No. - BQ2084-V143_07 |
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Similar Description - BQ2084-V143_07 |
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