BQ2084-V140_14 Datasheet, PDF (45/64 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
DeviceChemistry() (0x22)
Description: This function returns a character string that contains the battery chemistry. For example, if the
DeviceChemistry() function returns NiMH, the battery pack contains nickel metal hydride cells. The bq2084-V140
sets DeviceChemistry() to the value programmed in Device Chemistry DF 0x22-0x26.
Purpose: The DeviceChemistry() function gives cell chemistry information for use by charging systems. The
bq2084-V140 does not use DeviceChemisty() values for internal charge control or fuel gauging.
SMBus protocol: Read block
Output: String—character string with maximum length of 4 characters (4 + length byte).
The following is a partial list of chemistries and their expected abbreviations. These abbreviations are not case
sensitive.
CHEMISTRY
Lead acid
Lithium ion
Nickel cadmium
Nickel metal hydride
Nickel zinc
Rechargeable alkaline-manganese
Zinc air
ABBREVIATIONS
PbAc
LION
NiCd
NiMH
NiZn
RAM
ZnAr
The ManufacturerData() (0x23)
Description: This function allows access to the manufacturer data contained in the battery (data). The
bq2084-V140 stores seven critical operating parameters in this data area.
Purpose: The ManufacturerData() function may be used to access the manufacturer's data area. The data fields
of this command reflect the programming of eight critical data flash locations and can be used to facilitate
evaluation of the bq2084-V140 under various programming sets. The ManufacturerData() function returns the
following information in order: Pack Configuration, Gauge Configuration, Misc Configuration (2 bytes), Digital
Filter, Self Discharge Rate, Pack Load Estimate, Battery Low%, and Near Full (2 bytes) AFE Status, and the
pending EDV threshold voltage (low byte and high byte).
SMBus protocol: Read block
Output: Block data—data that reflects data flash programming as assigned by the manufacturer with maximum
length of 13 characters (13 + length byte).
Pack Status and Pack Configuration (0x2f)
This function returns the pack status and pack configuration registers. The pack status register contains a
number of status bits relating to bq2084-V140 operation. The pack status register is the least significant byte of
the word. The pack configuration register reflects how the bq2084-V140 is configured as defined by the value
programmed in Pack Configuration in DF 0x28.
The pack status register consists of the following bits:
b7
b6
b5
b4
b3
b2
PRES
EDV2
SS
VDQ
AFEFAIL
PF
b1
CVOV
b0
CVUV
PRES
The PRES bit indicates that the bq2084-V140 has been inserted into the system.
0 bq2084-V140 is out of the system
1 bq2084-V140 is inserted into a system
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