Texas Instruments bq27500 5.7.4 HIBERNATE MODE

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ExitFromSLEEP

|AverageCurrent()| >SleepCurrent

CurrentisDetectedaboveIWAKE

EntryToHIBERNATE

HosthassetControlStatus

[HIBERNATE]=1

VCELL<HibernateVoltage

Fuelgauginganddata

updatedevery1s,

ICC= Normal

NORMAL

Fuelgauginganddata

updatedevery60seconds

ICC= Sleep

SLEEP

Disableallbq8032

subcircuitsexceptGPIO.

Set/BAD_GDto“high”

status

ICC=Hibernate

HIBERNATE

EntrytoSLEEP

OperationConfiguration[SLEEP]=1

AND

|AverageCurrent()|≤SleepCurrent

WakeupFromHIBERNATE

CommunicationActivity

AND

CommaddressisNOTforbq27500/1

ExitFrom HIBERNATE

(CommunicationActivity

AND

Commaddressisforbq27500/1)

BatteryRemoved

(ControlStatus

[HIBERNATE]issetto 0.

POR

Checkforbatteryinsertion

fromHALTstate

Nogauging

ICC= Sleep

BATINSERTCHECK

EntrytoNORMAL

Flags[BAT_DET]=1

ExitFromNORMAL

Flags[BAT_DET]=0

ExitFromSLEEP

Flags[BAT_DET]=0

5.7.4 HIBERNATE MODE

bq27500

bq27501

System-Side Impedance Track™ Fuel Gauge

SLUS785 – SEPTEMBER 2007

Figure 5-2. Power Mode Diagram

HIBERNATE mode should be used when the system equipment needs to enter a very low-power state,and minimal gauge power consumption is required. This mode is ideal when a system equipment is set toits own SLEEP, HIBERNATE, or SHUTDOWN modes.

To enter HIBERNATE mode, either the system must set the [HIBERNATE] bit of the CONTROL STATUSregister OR the cell voltage must fall below Hibernate Voltage. The gauge will remain in HIBERNATEmode until the battery is removed, or the system issues a direct I

C command to the gauge. I

CCommunication that is not directed to the gauge will not wake the gauge.

It is important that BAT_GD be set to disable status (no battery charging/discharging). This prevents acharger application from inadvertently charging the battery before an OCV reading can be taken. It is thesystem’s responsibility to wake the bq27500/1 after it has gone into HIBERNATE mode. After waking, thegauge can proceed with the initialization of the battery information (OCV, profile selection, etc.)

Figure 5-2. Power Mode Diagram

HIBERNATE mode should be used when the system equipment needs to enter a very low-power state,and minimal gauge power consumption is required. This mode is ideal when a system equipment is set toits own SLEEP, HIBERNATE, or SHUTDOWN modes.

To enter HIBERNATE mode, either the system must set the [HIBERNATE] bit of the CONTROL STATUSregister OR the cell voltage must fall below Hibernate Voltage. The gauge will remain in HIBERNATEmode until the battery is removed, or the system issues a direct I

C command to the gauge. I

CCommunication that is not directed to the gauge will not wake the gauge.

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