BQ24165_14 Datasheet, PDF (24/38 Pages) Texas Instruments – 2.5A, Dual-Input, Single Cell Switch Mode Li-Ion Battery Charger with Power Path Management

bq24165
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SLUSAP4B – DECEMBER 2011 – REVISED MARCH 2013
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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the battery is removed, there is a timer fault or the input supply is no longer valid.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
V_SUPPLY < V_UVLO
V_SUPPLY < (V_BAT+V_SLP)
(V_BAT+V_SLP) < V_SUPPLY < V_OVP
VS_UPPLY > V_OVP
PG BEHAVIOR
High-Impedance
High-Impedance
Low
High-Impedance
Table 4. CHG Status Indicator
CHARGE STATE
New Charge Cycle in progress
Charging suspend by TS fault
Charging suspended by thermal loop
New Cycle Charge Done
Recharge Cycle after Termination
Timer Fault
No Valid Supply
No Battery Present
CHG BEHAVIOR
Low (first charge cycle)
High-Impedance (recharge cycles)
High-Impedance
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