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BQ27520-G4 Datasheet, PDF (14/34 Pages) Texas Instruments – System-Side Impedance Track Fuel Gauge | |||
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bq27520-G4
SLUSB20B â NOVEMBER 2012 â REVISED DECEMBER 2015
Device Functional Modes (continued)
Exit From HIBERNATE
Battery Removed
POR
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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
Î AverageCurrent ( ) Î < 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
Î AverageCurrent ( ) Î > Sleep Current
OR
Current is detected above Î WAKE
Exit From SLEEP+
Any communication to the gauge
OR
Î AverageCurrent ( ) Î > Sleep Current
OR
Current is detected above Î WAKE
SLEEP+
Entry To SLEEP+
Operation Configuration [SLEEP] = 1
AND
Î AverageCurrent ( ) Î < 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
VCELL < 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 DiagramâSystem Sleep
14
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