BQ28Z560-R1 Datasheet, PDF (44/60 Pages) Texas Instruments – Single Cell Li-Ion Battery Gas Gauge and Protection

bq28z560-R1
SLUSBD3 – APRIL 2013
www.ti.com
POR
Exit From HIBERNATE
VBAT < POR threshold
NORMAL
Fuel gauging and data
updated every 1 s
Exit From HIBERNATE
Communication Activity
OR
the gas gauge clears Control Status
[ HIBERNATE ] = 0
Entry to SLEEP
Pack Configuration[ SLEEP] = 1
Recommend Host also set Control
AND
Status [HIBERNATE] = 0
| AverageCurrent( ) | =Sleep Current
Exit From SLEEP
Pack Configuration [SLEEP ] =0
OR
| AverageCurrent( ) | > Sleep Current
OR
Current is Detected above IWAKE
Exit from SHUTDOWN
Charger Detected
AND
Protection FETs closed
HIBERNATE
SLEEP
SHUTDOWN
Disable all gas gauge
subcircuits except GPIO
Fuel gauging and data
updated every 20 seconds
Wakeup From HIBERNATE
Exit From WAIT_ HIBERNATE
Cell relaxed
AND
| AverageCurrent () | < Hibernate
Current
OR
Cell relaxed
VBAT _<
AND
Hibernate Voltage
WAIT_ HIBERNATE
Communication Activity
AND
Comm address is NOT for the gas gauge
Entry to WAITFULLSLEEP
Full Sleep Wait Time > 0
Exit From WAITFULLSLEEP
Any Communication Cmd
WAITFULLSLEEP
FULLSLEEP Count Down
Exit From WAIT H_ IBERNATE
Host must set Control Status
[ HIBERNATE ] = 0
Entry to FULLSLEEP
VBAT
AND
> Hibernate
Voltage
Host must set Control Status
[FULLSLEEP] = 1
Entry to FULLSLEEP
Count < 1
Exit From FULLSLEEP
Any Communication Cmd
FULLSLEEP
Fuel gauging and data
updated every 20 s
System HIBERNATION
Exit From SLEEP
(Host has set Control Status
[HIBERNATE ] = 1
OR
VBAT < Hibernate Voltage
In low-power state of SLEEP
mode. Gas gauging and data
are updated every 20 s.
System SLEEP
Exit from PRE-SHUTDOWN
Communication Activity
OR
Current Detected > IWAKE
Fuel Gauge is OFF
VBAT = 0 V
Entry to SHUTDOWN
No Charger Present
Entry to PRE-SHUTDOWN
[SHUTDOWN ] = 1
PRE - SHUTDOWN
Fuel Gauging stopped
Discharge FET opened
IBAT = Hibernate
System SHUTDOWN
Figure 7. Power Mode Diagram
NORMAL MODE
The gas gauge is in NORMAL mode when not in any other power mode. During this mode, AverageCurrent(),
Voltage(), and Temperature() measurements are taken, and the interface data set is updated. Decisions to
change states are also made. This mode is exited by activating a different power mode.
Because the gauge consumes the most power in NORMAL mode, the algorithm minimizes the time the gas
gauge remains in this mode.
NOTE
When the battery is connected for the first time, discharging may not be enabled. For this
case, one of the following procedures is required:
Short the VM pin to the VSS pin or connect the charger such that the IC returns to normal
status.
SLEEP MODE
SLEEP mode is entered automatically if the feature is enabled (Pack Configuration [SLEEP]) = 1) and
AverageCurrent() is below the programmable level Sleep Current. Once entry into SLEEP mode has been
qualified, but prior to entering it, the bq28z560-R1 performs an ADC auto-calibration to minimize offset.
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