BQ24618_15 Datasheet, PDF (23/43 Pages) Texas Instruments – System Power Selector and Low

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bq24618
SLUSA55B – OCTOBER 2010 – REVISED APRIL 2015
Feature Description (continued)
Recovery Method: The timer fault clears when the battery voltage falls below the recharge threshold, and
battery detection begins. A POR condition or taking CE low also clears the fault.
Condition 2: The battery voltage is below the recharge threshold and a time-out fault occurs.
Recovery Method: Under this scenario, the bq24618 applies the I_FAULT current to the battery. This small current
is used to detect a battery-removal condition and remains on as long as the battery voltage stays below the
recharge threshold. If the battery voltage goes above the recharge threshold, the bq24618 disables the fault
current and executes the recovery method described in Condition 1. A POR condition or taking CE low also
clears the fault.
8.3.20 PG Output
The open-drain PG (power-good) output indicates whether the VCC voltage is valid or not. The open-drain FET
turns on whenever the bq24618 has a valid VCC input (not in UVLO or ACOV or SLEEP mode). The PG pin can
be used to drive an LED or communicate to the host processor.
8.3.21 CE (Charge Enable)
The CE digital input is used to disable or enable the charge process. A high-level signal on this pin enables
charge, provided all the other conditions for charge are met (see Enable and Disable Charging). A high-to-low
transition on this pin also resets all timers and fault conditions. There is an internal 1-MΩ pulldown resistor on the
CE pin, so if CE is floated, the charge does not turn on.
8.3.22 Charge Status Outputs
The open-drain STAT1 and STAT2 outputs indicate various charger operations as shown in Table 2. These
status pins can be used to drive LEDs or communicate with the host processor. OFF indicates that the open-
drain transistor is turned off.
Table 2. STAT Pin Definition for bq24618
CHARGE STATE
Charge in progress
Charge complete
Charge suspend, timer fault, overvoltage, sleep mode, battery absent
STAT1
ON
OFF
OFF
STAT2
OFF
ON
OFF
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