Datasheet

www.ti.com
SBS MAC command 0x05
received
SBS.Current( ) <= 0?
Pack voltage < Vpack
threshold ?
bq2084 Enters Shutdown
Yes
Yes
No
No
Reset Conditions
COMMUNICATION
bq2084-V143
SLUS732 – SEPTEMBER 2006
Figure 3. Shutdown Flow Chart in Normal Operation
Figure 4. Shutdown Flow Chart in SBS MAC
On power up, the entire IC is reset and data is loaded from Data Flash to configure the SBS Data and the
battery management solution. On a partial reset (loss of VCC but RBI holds RAM valid), a limited number of
locations are taken. These actions are the following:
• The AFE registers are rewritten.
• PackStatus() EDV2 flag is cleared.
• BatteryStatus() DISCHARGING flag is cleared.
• The charger and alarm broadcast period is set to 10 seconds between broadcasts.
The bq2084-V143 includes an SMBus communication port. The SMBus interface is a 2-wire bidirectional
protocol using the SMBC (clock) and SMBD (data) pins. The communication lines are isolated from V
CC
and
may be pulled up higher than VCC. Also, the bq2084-V143 does not pull these lines low if V
CC
to the part is
zero. The communication ports allow a host controller, an SMBus compatible device, or other processor to
access the memory registers of the bq2084-V143. In this way a system can efficiently monitor and manage the
battery.
29
Submit Documentation Feedback