BQ24013 Datasheet, PDF (13/21 Pages) Texas Instruments – SINGLE-CHIP, LI-ION CHARGE MANAGEMENT IC FOR HANDHELD APPLICATIONS (bq TINY)

bq24010, bq24012, bq24013, bq24014
www.ti.com
SLUS530F − SEPTEMBER 2002 − REVISED AUGUST 2005
FUNCTIONAL DESCRIPTION
After charge termination, the bqTINY restarts the charge once the voltage on the BAT pin falls below the V_(RCH)
threshold. This feature keeps the battery at full capacity at all times. Please see Battery Absent Detection section
for additional details.
SLEEP MODE
The bqTINY enters the low-power sleep mode if the V_CC is removed from the circuit (PG pin is high impedance). This
feature prevents draining the battery during the absence of V_CC. The status pins do not function when in sleep mode
or when V_CC < V_POR and default to the OFF state.
CHARGE STATUS OUTPUTS
The open-collector STAT1 and STAT2 outputs indicate various charger operations as shown in the following table.
These status pins can be used to drive LEDs or communicate to the host processor. Note that OFF indicates the
open-collector transistor is turned off. When V_CC < V_POR or V_CC < V_BAT (Sleep Mode − PG OFF) the STAT pins default
to their OFF state. Note that this STAT1/STAT2 OFF/OFF state is shared by several operating conditions. Monitoring
IN, BAT, PG and TS, it is possible to decode the actual fault condition.
Table 2. Status Pins Summary
CHARGE STATE
STAT1 STAT2
Charge-in-progress
Charge done
ON
OFF(^{)
OFF
ON
Battery absent
Charge suspend (temperature)
Timer fault
Sleep mode
OFF
OFF
({) OFF means the open-collector output transistor on the STAT1
or STAT2 pins is in an off state.
PG OUTPUT
The open-collector PG (power good) indicates when the ac adapter (i.e. V_CC) is present. The PG bipolar transistor
turns ON when a valid V_CC is detected. This output is turned off in the sleep mode. The PG pin can be used to drive
an LED or communicate to the host processor.
CE INPUT (CHARGE ENABLE)
The CE digital input is used to disable or enable the charge process. A low-level signal on this pin enables the charge
and a high-level signal disables the charge. A high-to-low transition on this pin also resets all timers and fault
conditions and starts a new charge cycle.
TTE INPUT (TIMER AND TERMINATION ENABLE)
The TTE digital input is used to disable or enable the fast-charge timer and charge termination. A low-level signal
on this pin enables the fast-charge timer and termination and a high-level signal disables this feature. A high-to-low
transition on this pin also resets all timers.
THERMAL SHUTDOWN AND PROTECTION
The bqTINY monitors the junction temperature, T_J, of the die and suspends charging if T_J exceeds 155_C. Charging
resumes when T_J falls below approximately 130_C.
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