BQ28Z560-R1 datasheet(45/60 Pages) TI1

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bq28z560-R1

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SLUSBD3 – APRIL 2013

While in SLEEP mode, the gas gauge can suspend serial communications as much as 4 ms by holding the

comm line(s) low. This delay is necessary to correctly process host communication, since the gas gauge

processor is mostly halted in SLEEP mode.

During the SLEEP mode, bq28z560-R1 periodically takes data measurements and updates its data set.

However, a majority of its time is spent in an idle condition. The bq28z560-R1 exits SLEEP if any entry condition

is broken, specifically when (1) AverageCurrent() rises above Sleep Current, or (2) a current in excess of IWAKE

through RSENSE is detected.

FULLSLEEP MODE

FULLSLEEP mode is entered automatically if the feature is enabled by setting the Configuration [FULLSLEEP]

bit in the Control Status register when the bq28z560-R1 is in SLEEP mode. The gauge exits the FULLSLEEP

mode when there is any communication activity. Therefore, the execution of SET_FULLSLEEP sets the

[FULLSLEEP] bit, but EVSW might still display the bit clear. FULLSLEEP mode can be verified by measuring the

current consumption of the gauge. In this mode, the high frequency oscillator is turned off. The power

consumption is further reduced in this mode compared to SLEEP mode.

FULLSLEEP mode can also be entered by setting the Full Sleep Wait Time to be a number larger than 0.

FULLSLEEP will be entered when the timer counts down to 0. This feature is disabled when the data flash is set

as 0.

During FULLSLEEP mode, the bq28z560-R1 periodically takes data measurements and updates its data set.

However, a majority of its time is spent in an idle condition.

The bq28z560-R1 exits SLEEP if any entry condition is broken, specifically when (1) AverageCurrent() rises

above Sleep Current, or (2) a current in excess of IWAKE through RSENSE is detected.

While in FULLSLEEP mode, the gas gauge can suspend serial communications as much as 4 ms by holding the

comm line(s) low. This delay is necessary to correctly process host communication, since the gas gauge

processor is mostly halted in SLEEP mode.

Clearing FULLSLEEP Mode

FULLSLEEP mode will stay on permanently if Full Sleep Wait Time is not set to 0.

Clearing FULLSLEEP mode:

•

If Full Sleep Wait Time is set to 0, the CLEAR condition clears the flag. If it is not set to 0, the CLEAR

condition resets the timer.

•

The CLEAR condition determines that there is I2C communication while FULLSLEEP is active. I2C

communication while not in FULLSLEEP will NOT clear the flag. This means if there is current flowing when

the FULLSLEEP command is sent, there is no way to clear it until after the device enters SLEEP mode.

HIBERNATE MODE

HIBERNATE mode should be used when the host system needs to enter a low-power state, and minimal gauge

power consumption is required. This mode is ideal when the host is set to its own HIBERNATE, SHUTDOWN, or

OFF modes. The gas gauge can enter HIBERNATE due to either low cell voltage or low load current.

•

HIBERNATE due to the load current—If the gas gauge enters the HIBERNATE mode due to the load current,

the [HIBERNATE] bit of the CONTROL_STATUS register must be set. 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.

•

HIBERNATE due to the cell voltage—When the cell voltage drops below the Hibernate Voltage and a valid

OCV measurement has been taken, the gas gauge enters HIBERNATE mode. The [HIBERNATE] bit of the

CONTROL register has no impact for the gas gauge to enter the HIBERNATE mode. If the [SHUTDOWN] bit

of CONTROL _STATUS is also set.

The gauge will remain in HIBERNATE mode until communication activity appears on the communication lines.

Upon exiting HIBERNATE mode, the [HIBERNATE] bit of CONTROL_STATUS is cleared.

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