USB

HOST

BQ24392

DP_HOST

DM_HOST

SYSTEM

&

CHARGER

100 k

10 k

3.3V

10 k

Diode

0.5V

GND

0.1 µF

2.2

1 µF~

10 µF

2.2

2.2

USB

PORT

1 pF

ESD

1 pF

ESD

1pF-10pF

ESD

CHG_DET

SW_OPEN

CHG_AL_N

GOOD_BAT

VBUS

DM_CON

DP_CON

Data Lines

VBUS and

Ground

BQ24392

SLIS146D – JUNE 2012 – REVISED JANUARY 2016

www.ti.com

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.

Figure 5. Application Schematic

10

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