BQ27510-G1 Datasheet, PDF (26/39 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge With Direct Battery Connection

bq27510-G1
SLUS927 – APRIL 2009 ..................................................................................................................................................................................................... www.ti.com
Exit From HIBERNATE
Battery Removed
Exit From HIBERNATE
Communication Activity
AND Comm address is for bq27510
bq27500/1 clears Control Status
[HIBERNATE] = 0
Recommend Host also set Control
Status [HIBERNATE] = 0
HIBERNATE
Disable all bq27510
subcircuits except GPIO.
Negate /BAT_GD
Wakeup From HIBERNATE
Communication Activity
AND
Comm address is NOT for bq27510
POR
BAT INSERT CHECK
Check for battery insertion
from HALT state.
No gauging
Flags [BAT_DET] = 0
Entry to NORMAL
Flags [BAT_DET] = 1
Exit From NORMAL
Flags [BAT_DET] = 0
NORMAL
Fuel gauging and data
updated every 1s
Entry to SLEEP
Operation Configuration[SLEEP] = 1
AND
| AverageCurrent( ) |≤ Sleep Current
Exit From SLEEP
Flags [BAT_DET] = 0
Exit From WAIT_HIBERNATE
Cell relaxed
AND
| AverageCurrent() | < Hibernate
OR
Cell relaxed
AND
VCELL < Hibernate Voltage
WAIT_HIBERNATE
Fuel gauging and data
updated every 20 seconds
/BAT_GD unchanged
Exit From WAIT_HIBERNATE
Host must set Control Status
[HIBERNATE] = 0
AND
VCELL > Hibernate Voltage
Exit From SLEEP
| AverageCurrent( ) | > Sleep Current
OR
Current is Detected above IWAKE
SLEEP
Fuel gauging and data
updated every 20 seconds
System Shutdown
Exit From SLEEP
(Host has set Control Status
[HIBERNATE] = 1
OR
VCELL < Hibernate Voltage
Figure 2. Power Mode Diagram
NORMAL Mode
The fuel 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 Impedance Track™ algorithm minimizes
the time the fuel gauge remains in this mode.
SLEEP Mode
SLEEP mode is entered automatically if the feature is enabled (Operation 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 bq27510performs an ADC autocalibration to minimize offset.
During SLEEP mode, the bq27510 periodically takes data measurements and updates its data set. However, a
majority of its time is spent in an idle condition.
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