BQ27520-G4 Datasheet, PDF (15/34 Pages) Texas Instruments – System-Side Impedance Track Fuel Gauge

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Device Functional Modes (continued)
bq27520-G4
SLUSB20B – NOVEMBER 2012 – REVISED DECEMBER 2015
Exit From HIBERNATE
Battery Removed
Exit From HIBERNATE
Communication Activity
AND Comm address is for bq27531
bq27531 clears CONTROL_STATUS
[HIBERNATE] = 0
Recommend Host also set
CONTROL_STATUS
[HEBERNATE] = 0
POR
BAT INSERT CHECK
Check for battery insertion
from HALT state.
No gauging
Exit From SLEEP
Flags [BAT_DET] = 0
Flags [BAT_DET] = 0
Entry To NORMAL
Flags [BAT_DET] = 1
Exit From NORMAL
Flags [BAT_DET] = 0
NORMAL
Fuel gauging and data
updated every second.
HIBERNATE
Disable all bq27531
subcircuits.
Wakeup From HIBERNATE
Communication Activity
AND
Comm address is not for
bq27531
Exit From WAIT_HIBERNATE
Host must set CONTROL_STATUS
[HIBERNATE] = 0
AND
V_CELL < Hibernate Voltage
To SLEEP
Exit From WAIT_HIBERNATE
Cell relaxed
AND
Ι AverageCurrent () Ι < Hibernate
Current
OR
Cell relaxed
AND
V_CELL < Hibernate Voltage
WAIT_HIBERNATE
Fuel gauging and data
updated every 20 seconds.
Exit From SLEEP
Host has set CONTROL_STATUS
[HIBERNATE] = 1
OR
V_CELL < Hibernate Voltage
System Shutdown
Figure 7. Power Mode Diagram—System Shutdown
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Product Folder Links: bq27520-G4
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