BQ28Z560-R1 Datasheet, PDF (48/60 Pages) Texas Instruments – Single Cell Li-Ion Battery Gas Gauge and Protection

bq28z560-R1
SLUSBD3 – APRIL 2013
OPERATIONAL MODES
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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
0
0
0
0
1
1
1
1
RSNS0
0
0
1
1
0
0
1
1
IWAKE
0
1
0
1
0
1
0
1
Vth (SRP–SRN)
Disabled
Disabled
+1.0 mV or –1.0 mV
+2.2 mV or –2.2 mV
+2.2 mV or –2.2 mV
+4.6 mV or –4.6 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
NORMAL
SLEEP
FULLSLEEP
Enter Mode
If ALL conditions are satisfied like
Average Current, Cell Voltage, and
Temperature.
SLEEP bit set = 1 in the Control
register AND AverageCurrent
measured is equal to Sleep current
value.
From SLEEP mode if the
WAIT_FULLSLEEP wait is
programmed, this is the time the
system must be in SLEEP mode
before it can go to FULLSLEEP
mode.
Exit Mode
Comment
Go into other modes like SLEEP,
FULLSLEEP, HIBERNATE, or
SHUTDOWN if conditions are
satisfied.
In this mode, power consumption is
the highest. Measurements are taken
and updated every 1 s.
Change SLEEP bit = 0 OR
AverageCurrent measurement > Sleep
current value OR Current detected is
above the I_WAKE setting.
The data is measured every 20 s to
reduce current consumption.
The system exits the FULLSLEEP
mode if there are any communication
commands set on the bus to the
device.
The wait time to enter FULLSLEEP
from SLEEP is 1 s to 240 s with the
default at 15 s.
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