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DeviceChemistry() (0x22)

The ManufacturerData() (0x23)

Pack Status and Pack Configuration (0x2f)

bq2084-V143

SLUS732 – SEPTEMBER 2006

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-V143

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-V143 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 ABBREVIATIONS

Lead acid PbAc

Lithium ion LION

Nickel cadmium NiCd

Nickel metal hydride NiMH

Nickel zinc NiZn

Rechargeable alkaline-manganese RAM

Zinc air ZnAr

Description: This function allows access to the manufacturer data contained in the battery (data). The

bq2084-V143 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-V143 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).

This function returns the pack status and pack configuration registers. The pack status register contains a

number of status bits relating to bq2084-V143 operation. The pack status register is the least significant byte of

the word. The pack configuration register reflects how the bq2084-V143 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 b1 b0

PRES EDV2 SS VDQ AFEFAIL PF CVOV CVUV

PRES

The PRES bit indicates that the bq2084-V143 has been inserted into the system.

0 bq2084-V143 is out of the system

1 bq2084-V143 is inserted into a system

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