BQ24392_15 Datasheet, PDF (10/22 Pages) Texas Instruments – bq24392 Dual SPST USB 2.0 High Speed Switch with USB Battery Charging Specification Revision 1.2 Detection

bq24392
SLIS146C – JUNE 2012 – REVISED JANUARY 2015
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Data Lines
VBUS and
Ground
Figure 4. Data Connections Recessed from Power Connections
However, in some cases the charger is inserted very slowly, causing the VBUS and GND to make contact long
before D+ and D–. Due to this effect, there is no guaranteed detection time as the detection time can vary based
on how long it takes to insert the charger. If longer than 600 ms is taken to insert the charger into the USB
receptacle, the detection algorithm of the BQ24392 will timeout and instead of the charger being detected as a
DCP, it is now detected as a nonstandard charger (D+ and D– floating).
8.2 Typical Application
The BQ24392 device is used between the micro or mini-USB connector port and USB host to enable and disable
the USB data path and detect chargers that are inserted into the micro or mini-USB connector.
USB
HOST
DM_HOST
DP_HOST
3.3V
VBUS
100 kΩ 10 kΩ
10 kΩ
SYSTEM
&
CHARGER
GOOD_BAT
SW_OPEN
CHG_AL_N
CHG_DET
Diode
0.5V
BQ24392
VBUS
2.2 Ω
2.2 Ω
DM_CON
2.2 Ω
DP_CON
GND
Figure 5. Application Schematic
0.1 µF
1 µF~
10 µF
USB
PORT
10
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