BQ2084DBTR-V150 Datasheet, PDF (27/69 Pages) Texas Instruments – SBS v1.1-COMPLIANT GAS GAUGE WITH LED DELAY

bq2084-V150
www.ti.com
SLUS758 – JUNE 2007
Vpack is programmed in units of 0.935 mV/count and has tolerance of ±6%. For example, to set 12 V as Vpack
Threshold, the program value should be 12000/0.935 = 12834.
When the DSG FET is turned on, the pack voltage is close to the battery voltage even with no charger attached.
Therefore, to enter shutdown, the Vpack threshold should be set higher than the shutdown threshold plus the
tolerance.
The bq2084-V150 can also be instructed to enter Shutdown mode via the ManufacturerAccess() command.
When the command is sent to the bq2084-V150, the bq29312A is instructed to enter shutdown mode by the
bq2084-V150. This forces the chipset into its lowest power mode. The bq2084-V150 does not issue a shutdown
command to the AFE unless the pack voltage is less than the Vpack Threshold. Program the Vpack threshold
higher than the SBS.Voltage() when ship command is issued. Exit from this mode is only achieved by
application of a charger.
After exiting shutdown mode, the bq2084-V150 does not enter the shutdown mode again until the Shutdown
Timer (DF 0x133, units are seconds) has expired even if the correct conditions are present. After the Shutdown
Timer has expired, the SMBus command or voltage and current conditions enables the bq2084-V150 to enter
shutdown mode.
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