BQ27425-G2_15 Datasheet, PDF (13/39 Pages) Texas Instruments – Fuel Gauge With Integrated Sense Resistor

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Device Functional Modes (continued)
bq27425-G2
SLUSB23B – OCTOBER 2012 – REVISED JUNE 2015
Exit From HIBERNATE
V _CELL < POR threshold
OFF
REGIN pin = OFF,
V_CC pin = OFF
Entry to SHUTDOWN
REGIN pin > V_REGIN min
SHUTDOWN
REGIN pin > V_REGIN min,
V_CC pin = OFF
CE pin set LOW
(from any mode)
Exit From SHUTDOWN
CE pin raised HI
Power On Reset [POR]
Copy configuration ROM
defaults to RAM data.
Set Flags[ITPOR] = 1.
via RESET
subcommand
(from any mode)
Exit from CONFIG UPDATE
Flags [CFGUPMODE] = 0 AND [ITPOR] = 0
(via SOFT_RESET or a 240 second timeout)
INITIALIZATION
CONFIG UPDATE
Flags
[BAT _ DET ] = 0
Initialize algorithm and data.
Check for battery ins.ertion.
(No gauging in this mode.)
I _CC = Normal
Host can change RAM and
NVM based data blocks.
(No gauging in this mode.)
Entry to CONFIG UPDATE
Flags [CFGUPMODE] = 1
Entry to NORMAL
Flags [ BAT _ DET ] = 1
Exit From NORMAL
Flags [BAT _ DET ] = 0
(via SET_CFGUPDATE
subcommand)
Exit From HIBERNATE
Communication Activity
OR
bq27425 clears CONTROL_STATUS
[HIBERNATE ] = 0
Recommend Host also set Control
Status [HIBERNATE ] = 0
NORMAL
Fuel gauging and data
updated every 1s
ICC = Normal
Exit From SLEEP
Op Config [SLEEP ] = 0
OR
| AverageCurrent ( ) | > Sleep Current
OR
Current is Detected above I WAKE
HIBERNATE
Disable all subcircuits
except GPIO .
I CC = Hibernate
Wakeup From HIBERNATE
Communication to gauge
AND
Comm address is NOT for bq27425
Entry to SLEEP
Op Config [SLEEP ] = 1
AND
| AverageCurrent ( ) | < Sleep Current
Exit From WAIT _HIBERNATE
Host must set CONTROL_STATUS
[HIBERNATE ] = 0
AND
VCELL > Hibernate Voltage
SLEEP
Fuel gauging and data
updated every 20 seconds
I _CC = Sleep
Exit From WAIT _ HIBERNATE
Cell relaxed
AND
| AverageCurrent () | < Hibernate
Current
OR
Cell relaxed
AND
V CELL < Hibernate Voltage
WAIT _HIBERNATE
Fuel gauging and data
updated every 20 seconds
I CC = Sleep
Entry to System Shutdown
Host has set CONTROL_STATUS
[HIBERNATE ] = 1
OR
VCELL < Hibernate Voltage
System Shutdown
Figure 6. Power Mode Diagram
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Product Folder Links: bq27425-G2
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