Datasheet

ExitFromSLEEP
| AverageCurrent()|> SleepCurrent
| AverageCurrent()| ≤ SleepCurrent
OR
CurrentisDetectedaboveI
WAKE
ExitFrom SLEEP
(Hosthasset ControlStatus
[HIBERNATE]=1
OR
V
CELL
< HibernateVoltage
Fuel gauginganddata
updatedevery 1s
NORMAL
Fuel gauginganddata
updated every 20 seconds
SLEEP
Disableallbq27500/1
subcircuitsexceptGPIO
.
Negate BAT_GD
HIBERNATE
EntrytoSLEEP
OperationConfiguration [SLEEP]=1
AND
Wakeup From HIBERNATE
Communication Activity
AND
CommaddressisNOT for
bq27500/1
ExitFrom HIBERNATE
BatteryRemoved
POR
Checkforbatteryinsertion
fromHALT state.
Nogauging
BAT INSERT CHECK
EntrytoNORMAL
Flags [BAT_DET]=1
ExitFrom NORMAL
Flags [BAT_DET]=0
ExitFrom SLEEP
Flags [BAT_DET]=0
Flags [BAT_DET]=0
WAIT_HIBERNATE
Fuel gauginganddata
updatedevery 20 seconds
BAT_GD unchanged
ExitFromWAIT_HIBERNATE
Cellrelaxed
AND
| AverageCurrent()|<Hibernate
OR
Cellrelaxed
AND
V
CELL
< HibernateVoltage
SystemShutdown
ExitFrom WAIT_HIBERNATE
HostmustsetControlStatus
[HIBERNATE]=0
AND
V
CELL
> HibernateVoltage
ExitFrom HIBERNATE
Communication Activity
ANDCommaddressisfor
bq27500/1
bq27500 /1 clearsControlStatus
[HIBERNATE] =0
RecommendHostalsoset Control
Status [HIBERNATE] =0
5.7.4 HIBERNATE MODE
bq27500
bq27501
System-Side Impedance Track™ Fuel Gauge
SLUS785D – SEPTEMBER 2007 – REVISED APRIL 2008 www.ti.com
Figure 5-2. Power Mode Diagram
HIBERNATE mode should be used when the system equipment needs to enter a low-power state, and
minimal gauge power consumption is required. This mode is ideal when a system equipment is set to its
own HIBERNATE, SHUTDOWN, or OFF modes.
Before the fuel gauge can enter the HIBERNATE mode, the system must set the [HIBERNATE] bit of the
CONTROL_STATUS register. The gauge waits to enter HIBERNATE mode until it has taken a valid OCV
measurement and the magnitude of the average cell current has fallen below Hibernate Current. The
gauge can also enter HIBERNATE mode if the cell voltage falls below Hibernate Voltage, and a valid
OCV measurement has been taken. The gauge remains in HIBERNATE mode until the system issues a
direct I
2
C command to the gauge or a POR occurs. I
2
C communication that is not directed to the gauge
does not wake the gauge.
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