BQ27531-G1_16 Datasheet, PDF (13/34 Pages) Texas Instruments – Battery Management Unit Impedance Track Fuel Gauge

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Device Functional Modes (continued)
Exit From HIBERNATE
Battery Removed
POR
bq27531-G1
SLUSBE7C – MARCH 2013 – REVISED JANUARY 2016
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
BAT INSERT CHECK
Check for battery insertion
from HALT state.
No gauging
Entry To NORMAL
Flags [BAT_DET] = 1
Entry To SLEEP+
Operation Configuration [SLEEP] = 1
AND
CONTROL_STAUS [SNOOZE] = 1]
AND
Ι AverageCurrent ( ) Ι < Sleep Current
NORMAL
Fuel gauging and data
updated every second
Flags [BAT_DET] = 0
Exit From NORMAL
Flags [BAT_DET] = 0
Exit From SLEEP
Flags [BAT_DET] = 0
Exit From SLEEP
Ι AverageCurrent ( ) Ι > Sleep Current
OR
Current is detected above Ι _WAKE
Exit From SLEEP+
Any communication to the gauge
OR
Ι AverageCurrent ( ) Ι > Sleep Current
OR
Current is detected above Ι _WAKE
SLEEP+
Entry To SLEEP+
Operation Configuration [SLEEP] = 1
AND
Ι AverageCurrent ( ) Ι < Sleep Current
Fuel gauging and data
updated every 20 seconds.
Both LFO and HFO are ON.
AND
CONTROL_STAUS [SNOOZE] = 0
Entry to SLEEP
CONTROL_STATUS [SNOOZE] = 0
Entry to SLEEP+
CONTROL_STATUS [SNOOZE] = 1
Exit From WAIT_HIBERNATE
Host must set CONTROL_STATUS
[HIBERNATE] = 0
AND
V_CELL < Hibernate Voltage
SLEEP
Fuel gauging and data
updated every 20 seconds.
(LFO ON and HFO OFF)
To WAIT_HIBERNATE
Exit From SLEEP
Host has set CONTROL_STATUS
[HIBERNATE] = 1
OR
System Sleep ^{VCELL < Hibernate Voltage}
Figure 6. Power Mode Diagram—System Sleep
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