BQ28Z560-R1 datasheet(44/60 Pages) TI1

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Exit From SLEEP

Pack Configuration [SLEEP ] =0

| AverageCurrent( ) | > Sleep Current

Current is Detected above IWAKE

Fuel gauging and data

updated every 1 s

NORMAL

Fuel gauging and data

updated every 20 seconds

SLEEP

Disable all gas gauge

subcircuits except GPIO

HIBERNATE

Wakeup From HIBERNATE

Communication Activity

AND

Comm address is NOT for the gas gauge

Exit From HIBERNATE

VBAT < POR threshold

POR

Exit From WAIT_ HIBERNATE

Cell relaxed

AND

| AverageCurrent () | <

Hibernate

Current

Cell relaxed

AND

BAT < Hibernate Voltage

System HIBERNATION

Exit From HIBERNATE

Communication Activity

the gas gauge clears Control Status

[ HIBERNATE ] = 0

Recommend Host also set Control

Status

[ HIBERNATE] = 0

WAIT_HIBERNATE

Fuel gauging and data

updated every 20 s

In low-power state of SLEEP

mode Gas gauging and data

are updated every 20 s.

FULLSLEEP

System SLEEP

FULLSLEEP Count Down

WAITFULLSLEEP

Entry to FULLSLEEP

Host must set Control Status

[FULLSLEEP] = 1

Exit From FULLSLEEP

Any Communication Cmd

Exit From WAITFULLSLEEP

Any Communication Cmd

Entry to WAITFULLSLEEP

Full Sleep Wait Time > 0

Entry to FULLSLEEP

Count < 1

Exit From SLEEP

(Host has set Control Status

[

HIBERNATE ] = 1

Hibernate Voltage

Exit From WAIT HIBERNATE

Host must set Control Status

[ HIBERNATE ] = 0

AND

Hibernate Voltage

Entry to SLEEP

Pack Configuration[ SLEEP] = 1

AND

| AverageCurrent( ) | =Sleep Current

Fuel Gauge is OFF

= 0 V

SHUTDOWN

Entry to SHUTDOWN

No Charger Present

System SHUTDOWN

PRE-SHUTDOWN

Fuel Gauging stopped

Discharge FET opened

IBAT = Hibernate

Entry to PRE-SHUTDOWN

[ SHUTDOWN ] = 1

Exit from PRE-SHUTDOWN

Communication Activity

Current Detected >

IWAKE

Exit from SHUTDOWN

Charger Detected

AND

Protection FETs closed

BAT

bq28z560-R1

SLUSBD3 – APRIL 2013

www.ti.com

Figure 7. Power Mode Diagram

NORMAL MODE

The gas gauge is in NORMAL mode when not in any other power mode. During this mode, AverageCurrent(),

Voltage(), and Temperature() measurements are taken, and the interface data set is updated. Decisions to

change states are also made. This mode is exited by activating a different power mode.

Because the gauge consumes the most power in NORMAL mode, the algorithm minimizes the time the gas

gauge remains in this mode.

NOTE

When the battery is connected for the first time, discharging may not be enabled. For this

case, one of the following procedures is required:

Short the VM pin to the VSS pin or connect the charger such that the IC returns to normal

status.

SLEEP MODE

SLEEP mode is entered automatically if the feature is enabled (Pack Configuration [SLEEP]) = 1) and

AverageCurrent() is below the programmable level Sleep Current. Once entry into SLEEP mode has been

qualified, but prior to entering it, the bq28z560-R1 performs an ADC auto-calibration to minimize offset.

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