BQ28Z560-R1 datasheet(48/60 Pages) TI1

48 / 60 page

bq28z560-R1

SLUSBD3 – APRIL 2013

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OPERATIONAL MODES

POWER CONTROL

Reset Functions

When the bq28z560-R1 detects a software reset ([RESET] bit of Control() initiated), it determines the type of

reset and increments the corresponding counter. This information is accessible by issuing the command Control()

function with the RESET_DATA subcommand.

Wake-Up Comparator

The wake up comparator is used to indicate a change in cell current while the bq28z560-R1 is in SLEEP mode.

Pack Configuration uses bits [RSNS1–RSNS0] to set the sense resistor selection. Pack Configuration also uses

the [IWAKE] bit to select one of two possible voltage threshold ranges for the given sense resistor selection. An

internal interrupt is generated when the threshold is breached in either charge or discharge directions. Setting

both [RSNS1] and [RSN0] to 0 disables this feature.

Table 21. IWAKE Threshold Settings(1)

RSNS1

RSNS0

IWAKE

Vth (SRP–SRN)

Disabled

+1.0 mV or –1.0 mV

+2.2 mV or –2.2 mV

+4.6 mV or –4.6 mV

+9.8 mV or –9.8 mV

(1)

The actual resistance value vs. the setting of the sense resistor is not important, only the actual voltage threshold when calculating the

Configuration. The voltage thresholds are typical values under room temperature.

Flash Updates

Data flash can only be updated if Voltage() > Flash Update OK Voltage. Flash programming current can cause

an increase in the LDO dropout.

The mode of going from one state to another is as follows: NORMAL

→ SLEEP → FULLSLEEP, then from

FULLSLEEP to either HIBERNATE or SHUTDOWN.

Mode

Enter Mode

Exit Mode

Comment

Go into other modes like SLEEP,

If ALL conditions are satisfied like

In this mode, power consumption is

FULLSLEEP, HIBERNATE, or

NORMAL

Average Current, Cell Voltage, and

the highest. Measurements are taken

SHUTDOWN if conditions are

Temperature.

and updated every 1 s.

satisfied.

SLEEP bit set = 1 in the Control

Change SLEEP bit = 0 OR

AverageCurrent measurement > Sleep The data is measured every 20 s to

SLEEP

measured is equal to Sleep current

current value OR Current detected is

reduce current consumption.

value.

above the IWAKE setting.

From SLEEP mode if the

WAIT_FULLSLEEP wait is

The system exits the FULLSLEEP

The wait time to enter FULLSLEEP

programmed, this is the time the

mode if there are any communication

FULLSLEEP

from SLEEP is 1 s to 240 s with the

system must be in SLEEP mode

commands set on the bus to the

default at 15 s.

before it can go to FULLSLEEP

device.

mode.

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