Datasheet

bq24278
SLUSB04 –JUNE 2012 www.ti.com
The CHG output indicates new charge cycles. When a new charge cycle is initiated by CE, toggling High
Impedance mode or toggling the input power, CHG goes low and remains low until termination. After termination,
CHG remains high impedance until a new charge cycle is initiated. CHG does not go low during recharge cycles.
Table 2 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 1. PG Status Indicator
CHARGE STATE PG BEHAVIOR
V
IN
< V
UVLO
High-Impedance
V
IN
< (V
BAT
+V
SLP
) High-Impedance
(V
BAT
+V
SLP
) < V
IN
< V
OVP
Low
V
IN
> V
OVP
High-Impedance
Table 2. CHG Status Indicator
CHARGE STATE CHG BEHAVIOR
Charge in progress Low (first charge cycle)
High-Impedance (recharge cycles)
Charging suspended by thermal loop
Charge Done
Recharge Cycle after Termination
Timer Fault High-Impedance
No Valid Supply, V
IN
>V
OVP
or V
IN
< V
SLEEP
No Battery Present
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