BQ24153 Datasheet, PDF (20/40 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger With Full USB Compliance and USB-OTG Support

bq24153
bq24156, bq24158
SLUSA27 – MARCH 2010
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Bad Adaptor Detection/Rejection
At the POR of VBUS, the IC performs the bad adaptor detection by applying a current sink to VBUS. If the VBUS
is higher than V_IN(MIN) for 30ms, the adaptor is good and the charge process begins. Otherwise, if the VBUS
drops below V_IN(MIN), the bad adaptor is detected. Then, the IC disables the current sink, sends a send fault pulse
in FAULT pin and sets the bad adaptor flag (B2-B0=011 for Register 00H). After a delay of T_INT, the IC repeats
the adaptor detection process, as shown in Figure 28 and Figure 29.
Adpator
VBUS
VBUS
I_SHORT
(30 mA)
Adaptor Detection Control
GND
PGND
V_IN
V_IN(MIN)
V_{IN_GOOD}
Deglitch
30ms
V_{IN_POOR}
START
Delay
T_INT
Figure 28. Bad Adaptor Detection Circuit
20
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