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TUSB322I

SLLSEO5C – OCTOBER 2015 – REVISED MAY 2017

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Copyright © 2015–2017, Texas Instruments Incorporated

7.4.2 Active Mode

Active mode is defined as the port being attached. In active mode, all GPIOs are operational, and I2C is read /

write (R/W). When in active mode, the TUSB322I device communicates to the AP that the USB port is attached.

This communication happens through the ID pin if TUSB322I is configured as a DFP or DRP connect as source.

If TUSB322I is configured as a UFP or a DRP connected as a sink, the OUT1/OUT2 and INT_N/OUT3 pins are

used. The TUSB322I device exits active mode under the following conditions:

•

Cable unplug

•

VBUS removal if attached as a UFP

•

Dead battery; system battery or supply is removed

•

EN_N is floated or pulled high.

7.4.3 Shutdown Mode

Shutdown mode for TUSB322I is defined as follows:

•

Supply voltage available and EN_N pin is high or floating.

•

EN_N pin has internal pullup resistor

•

The TUSB322I device is off, but still maintains the Rd on the CC pins.

7.4.4 Dead Battery Mode

During dead battery mode, VDD is not available. CC pins always default to pulldown resistors in dead battery

mode. Dead battery mode means:

•

TUSB322I in UFP with 5.1 kΩ ± 20% Rd; cable connected and providing charge

•

TUSB322I in UFP with 5.1 kΩ ± 20% Rd; nothing connected (application could be off or have a discharged

battery)

NOTE

When VDD is off, the TUSB322I non-failsafe pins (DIR, VBUS_DET, ADDR, OUT[3:1] pins)

could back-drive the TUSB322I device if not handled properly. When necessary to pull

these pins up, TI recommends pulling up DIR, ADDR, and INT_N/OUT3 to the device’s

VDD supply. The VBUS_DET must be pulled up to VBUS through a 900-kΩ resistor.