BQ24232HA Datasheet, PDF (22/36 Pages) Texas Instruments – USB-Friendly Lithium-Ion Battery Charger

bq24232HA
SLUSCG4 – MAY 2016
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Device Functional Modes (continued)
7.4.1.5 Status Indicators (PGOOD, CHG)
The bq24232HA contains two open-drain outputs that signal its status. The PGOOD output signals when a valid
input source is connected. PGOOD is low when (V_BAT + V_IN(DT)) < V_IN < V_OVP. When the input voltage is outside
of this range, PGOOD is high impedance.
The CHG output signals when a new charge cycle is initiated. After a charge cycle is initiated, CHG goes low
once the battery is above the short-circuit threshold. CHG goes high impedance once the charge current falls
below I_TERM. CHG remains high impedance until the input power is removed and reconnected or the CE pin is
toggled. It does not signal subsequent recharge cycles.
Table 3. PGOOD Status Indicator
INPUT STATE
V_IN < V_UVLO
V_UVLO < V_IN < V_IN(DT) + V_BAT
V_IN(DT) + V_BAT < V_IN < V_OVP
V_IN > V_OVP
PGOOD OUTPUT
Hi impedance
Hi impedance
Low
Hi impedance
Table 4. CHG Status Indicator
CHARGE STATE
Charging
Charging terminated
Recharging after termination
Carging suspended by thermal loop
Safety timers expired
IC disabled or no valid input power
CHG OUTPUT
Low (first charge cycle)
Hi impedance until power or CE is toggled
Hi impedance
Low (first charge cycle)
Flashing at 2Hz
Hi impedance
7.4.1.5.1 Timer Fault
If the precharge timer expires before the battery voltage reaches V_LOWV, the bq24232HA indicates a fault
condition. Additionally, if the battery current does not fall to I_TERM before the fast-charge timer expires, a fault is
indicated. The CHG output flashes at approximately 2 Hz to indicate a fault condition.
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