Datasheet

bq24165
bq24166
bq24167
SLUSAP4B –DECEMBER 2011–REVISED MARCH 2013 www.ti.com
STATUS INDICATORS (CHG, PG)
The bq24165/6/7 contains two open-drain outputs that signal its status. The PG output indicates that a valid input
source is connected to USB or IN. PG is low when V
SUPPLY
>V
UVLO
AND (V
BAT
+V
SLP
) < V
SUPPLY
< V
OVP
. When
there is no supply connected to either input within this range, PG is high impedance. Table 3 illustrates the PG
behavior under different conditions.
During new charge cycles, the CHG output goes low to indicate a new charge cycle is in progress or that charge
has been suspended due to a TS pin fault or the thermal protection circuit. A new charge cycle is initiated by
removing and replacing the battery or toggling the input power. CHG remains low until charge termination unless
the battery is removed, there is a timer fault or the input supply is no longer valid. After termination of the new
charge cycle, CHG remains high impedance until a new charge cycle is initiated. CHG does not go low during
recharge cycles. Table 4 illustrates the CHG behavior under different conditions.
Connect PG and CHG to the DRV output through an LED for visual indication, or connect through a 100kΩ
pullup to the required logic rail for host indication.
Table 3. PG Status Indicator
CHARGE STATE PG BEHAVIOR
V
SUPPLY
< V
UVLO
High-Impedance
V
SUPPLY
< (V
BAT
+V
SLP
) High-Impedance
(V
BAT
+V
SLP
) < V
SUPPLY
< V
OVP
Low
VS
UPPLY
> V
OVP
High-Impedance
Table 4. CHG Status Indicator
CHARGE STATE CHG BEHAVIOR
New Charge Cycle in progress Low (first charge cycle)
Charging suspend by TS fault High-Impedance (recharge cycles)
Charging suspended by thermal loop
New Cycle Charge Done
Recharge Cycle after Termination
Timer Fault High-Impedance
No Valid Supply
No Battery Present
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