BQ27500 Datasheet, PDF (25/39 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

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NORMAL
IT Operations
(dsg, chg, rlx)
Bad batt ^Yes
detected?
No
Batt
Yes
removed?
No
Forced Yes
SLEEP
Mode?
No
bq27500
bq27501
System-Side Impedance Track™ Fuel Gauge
SLUS785 – SEPTEMBER 2007
Start
Bq27500 POR
Batt
No
detected?
Yes
Init
(“BAT_GD”
disabled, OCV
taken, “BAT_GD
enabled.)
Battery Volt No
Sufficient
to FG?
Yes
Batt Present
Yes
Icc >
I_standby -OR-
T_r > 30min
No
No
Batt
removed?
Yes
No Batt Present
-OR- bad batt
(“BAT_GD”
disabled)
Batt
Yes
detected?
No
SLEEP
Bad batt No
detected?
Yes
Yes
AC or USB
Present?
No
End
Figure 5-1. BAT_GD Pin Operation, Based Upon Battery Presence and bq27500 Operating Mode
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FUNCTIONAL DESCRIPTION
25