TUSB320LI datasheet(14/38 Pages) TI1

14 / 38 page

TUSB320HI, TUSB320LI

SLLSEP2B – AUGUST 2015 – REVISED SEPTEMBER 2016

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Product Folder Links: TUSB320HI TUSB320LI

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7.3.2 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 TUSB320 device communicates to the AP that the USB port is attached.

This happens through the ID pin if TUSB320 is configured as a DFP or DRP connect as source. If TUSB320 is

configured as a UFP or a DRP connected as a sink, the OUT1/OUT2 and INT_N/OUT3 pins are used. The

TUSB320 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

•

TUSB320L EN_N pin floated or pulled high

•

TUSB320H EN pin floated or pulled low.

During active mode, I2C be used to change the mode configuration. This can be done by following the sequence

below. This same sequence is valid when TUSB320 is in unattached mode.

•

Set DISABLE_TERM register (address 0x0A bit 0) to a 1'b1.

•

Change MODE_SELECT register (address 0x0A bits 5:4) to desired mode of operation.

•

Wait 5 ms.

•

Clear DISABLE_TERM register (address 0x0A bit 0) to 1'b0.

7.3.3 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:

•

TUSB320 in UFP with 5.1-kΩ ± 20% Rd; cable connected and providing charge

•

TUSB320 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 TUSB320 non-failsafe pins (VBUS_DET, ADDR, PORT, ID, OUT[3:1]

pins) could back-drive the TUSB320 device if not handled properly. When necessary to

pull these pins up, it is recommended to pullup PORT, ADDR, INT_N/OUT3, and ID to the

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

resistor.

7.3.4 Shutdown Mode

Shutdown mode for TUSB320L device is defined as follows:

•

Supply voltage available and EN_N pin is pulled high or floating.

•

EN_N pin has internal pullup resistor.

•

The TUSB320L device is off, but still maintains the Rd on the CC pins

Shutdown mode for TUSB320H device is defined as follows:

•

Supply voltage available and EN pin is pulled low or floating.

•

EN pin has internal pulldown resistor.

•

The TUSB320H device is off, but still maintains the Rd on the CC pins

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