BQ27546-G1 Datasheet, PDF (16/38 Pages) Texas Instruments – nullSingle-Cell Li-Ion Battery Fuel Gauge

bq27546-G1
SLUSC53A – MAY 2015 – REVISED DECEMBER 2015
Device Functional Modes (continued)
Exit From HIBERNATE
VCELL < POR threshold
Exit From HIBERNATE
Communication Activity
OR
The device clears Control Status
[HIBERNATE] = 0
Recommend Host also set Control
Status [HIBERNATE] = 0
POR
NORMAL
Fuel gauging and data
updated every 1s
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Exit From SLEEP
Pack Configuration [SLEEP] = 0
OR
| AverageCurrent( ) | > Sleep Current
OR
Current is Detected above IWAKE
HIBERNATE
Disable all device
subcircuits except GPIO.
Wakeup From HIBERNATE
Communication Activity
AND
Comm address is NOT for the device
Entry to SLEEP
Pack Configuration [SLEEP] = 1
AND
| AverageCurrent( ) |≤ Sleep Current
SLEEP
Fuel gauging and data
updated every 20 seconds
Exit From WAIT_HIBERNATE
Host must set Control Status
[HIBERNATE] = 0
AND
VCELL > Hibernate Voltage
Entry to WAITFULLSLEEP
Entry to FULLSLEEP
If Full Sleep Wait Time = 0,
Host must set Control Status
[FULLSLEEP]=1
If Full Sleep Wait Time > 0, Exit From WAITFULLSLEEP
Guage ignores Control Status Any Communication Cmd
[FULLSLEEP]
WAITFULLSLEEP
FULLSLEEP Count Down
Exit From WAIT_HIBERNATE
Cell relaxed
AND
| AverageCurrent() | < Hibernate
Current
OR
Cell relaxed
AND
VCELL < Hibernate Voltage
WAIT_HIBERNATE
Fuel gauging and data
updated every 20 seconds
System Shutdown
Exit From SLEEP
(Host has set Control Status
[HIBERNATE] = 1
OR
VCELL < Hibernate Voltage
Entry to FULLSLEEP
Count <1
FULLSLEEP
Exit From
FULLSLEEP
Any
Communication
Cmd
In low power state of SLEEP
mode. Gas gauging and data
updated every 20 seconds
System Sleep
Figure 9. Power Mode Diagram
9.4.1.1 NORMAL Mode
The fuel 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 Impedance Track™ algorithm minimizes
the time the fuel gauge remains in this mode.
9.4.1.2 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 is qualified, but
prior to entering it, the bq27546-G1 performs an ADC autocalibration to minimize offset.
While in SLEEP mode, the fuel gauge can suspend serial communications as much as 4 ms by holding the
comm line(s) low. This delay is necessary to correctly process host communication, since the fuel gauge
processor is mostly halted in SLEEP mode.
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