BQ2084-V140_14 Datasheet, PDF (43/64 Pages) Texas Instruments – SBS v1.1-COMPLIANT GAS GAUGE FOR USE WITH THE bq29312

bq2084-V140
www.ti.com
SLUS664B – JULY 2005 – REVISED AUGUST 2006
Output: Unsigned integer—count of total charge removed from the battery over its life.
Units: cycle
Range: 0 to 65,534 cycles; 65,535 indicates battery has experienced 65,535 or more cycles.
Granularity: 1 cycle
Accuracy: Absolute count
DesignCapacity() (0x18)
Description: Returns the theoretical or nominal capacity of a new pack. The DesignCapacity() value is
expressed in either current (mAh at a C/5 discharge rate) or power, (10 mWh at a P/5 discharge rate) depending
on the setting of the BatteryMode()CAPACITY_MODE bit.
Purpose: The DesignCapacity() function is used by the SMBus host's power management along with
FullChargeCapacity() to determine battery wear. The power management system may present this information to
the user and also adjust its power policy as a result.
SMBus protocol: Read word
Output: Unsigned integer—battery capacity in units of mAh or 10 mWh.
Units
Range
Granularity
Accuracy
BATTERY MODES
CAPACITY_MODE
BIT = 0
CAPACITY_MODE
BIT = 1
mAh
10 mWh
0-65,535 mAh
0-65,535 10 mWh
Not applicable
Not applicable
Not applicable
Not applicable
DesignVoltage() (0x19)
Description: Returns the theoretical voltage of a new pack (mV). The bq2084-V140 sets DesignVoltage() to the
value programmed in Design Voltage DF 0x04-0x05.
Purpose: The DesignVoltage() function can be used to give additional information about a particular smart
battery expected terminal voltage.
SMBus protocol: Read word
Output: Unsigned integer—the battery's designed terminal voltage in mV
Units: mV
Range: 0 to 65,535 mV
Granularity: Not applicable
Accuracy: Not applicable
SpecificationInfo() (0x1a)
Description: Returns the version number of the smart battery specification the battery pack supports, as well as
voltage and current scaling information in a packed unsigned integer. Power scaling is the product of the voltage
scaling times the current scaling. The SpecificationInfo() is packed in the following fashion:
(SpecID_H × 0x10 + SpecID_L) + (VScale + IPScale × 0x10) × 0x100.
The bq2084-V140 VScale (voltage scaling) and IPScale (current scaling) should always be set to zero. The
bq2084-V140 sets SpecificationInfo() to the value programmed in Specification Information DF 0x06-0x07.
Purpose: The SpecificationInfo() function is used by the SMBus host's power management system to determine
what information the smart battery can provide.
SMBus protocol: Read word
Output: Unsigned integer—packed specification number and scaling information:
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