BQ24050 Datasheet, PDF (17/37 Pages) Texas Instruments – 800mA Single Cell Li-Ion Battery Charger With Automatic Adaptor/USB Detection

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www.ti.com.................................................................................................................................... SLUS940A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009
pulled high (start of detection), to minimize any interaction between the charger detection pins and the USB
normal communications. If the device transceiver is able to communicate with the USB host, communication
typically starts after 100ms after the device has pulled the D+ or D– line high indicating it is “on line”, and by then
the IC detection is complete and has been disconnected. The device host then may change the ISET2 level or
disable the IC by pulling the TS pin low.
Sleep Mode
If the IN pin voltage is between than V_OUT+V_DT and UVLO, the charge current is disabled, the safety timer
counting stops (not reset) and the PG and CHG pins are high impedance. As the input voltage rises and the
charger exits sleep mode, the PG pin goes low, the safety timer continues to count, charge is enabled and the
CHG pin returns to its previous state. See Figure 18
New Charge Cycle
A new charge cycle is started when a good power source is applied, performing a chip disable/enable (TS pin),
exiting Termination and Timer Disable Mode (TTDM), detecting a battery insertion or the OUT voltage dropping
below the VRCH threshold. The CHG pin is active low only during the first charge cycle, therefore exiting TTDM
or a dropping below VRCH will not turn on the CHG pin FET, if the CHG pin is already high impedance.
Copyright © 2009, Texas Instruments Incorporated
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