TUSB320LI datasheet(28/38 Pages) TI1

28 / 38 page

TUSB320HI, TUSB320LI

SLLSEP2B – AUGUST 2015 – REVISED SEPTEMBER 2016

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Product Folder Links: TUSB320HI TUSB320LI

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8.3 Initialization Set Up

8.3.1 TUSB320L Initialization Procedure

The general power-up sequence for the TUSB320L device (EN_N tied to ground) is as follows:

1. System is powered off (device has no VDD). The TUSB320L device is configured internally in UFP mode with

Rds on CC pins (dead battery).

2. VDD ramps – POR circuit. VDD must ramp within 25 ms or less. IO pull-up power rail (i.e. pull up on ID, INT,

SCL, SDA, ADDR, PORT) must ramp with VDD or lag after VDD.

3. I2C supply ramps up.

4. The TUSB320L device enters unattached mode and determines the voltage level from the PORT pin. This

determines the mode in which the TUSB320L device operates (DFP, UFP, DRP).

5. The TUSB320L device monitors the CC pins as a DFP and VBUS for attach as a UFP.

6. The TUSB320L device enters active mode when attach has been successfully detected.

8.3.2 TUSB320H Initialization Procedure

The general power-up sequence for the TUSB320H device (EN tied to 1.8V or 3.3V) is as follows:

1. System is powered off (device has no VDD). The TUSB320H device is configured internally in UFP mode with

Rds on CC pins (dead battery).

2. VDD ramps – POR circuit. VDD must ramp within 25 ms or less. IO pull-up power rail (i.e. pull up on ID, INT,

SCL, SDA, ADDR, PORT) must ramp with VDD or lag after VDD.

3. I2C supply ramps up.

4. The TUSB320H device enters unattached mode and determines the voltage level from the PORT pin. This

determines the mode in which the TUSB320H device operates (DFP, UFP, DRP).

5. The TUSB320H device monitors the CC pins as a DFP and VBUS for attach as a UFP.

6. The TUSB320H device enters active mode when attach has been successfully detected.

9 Power Supply Recommendations

The TUSB320 device has a wide power supply range from 2.7 to 5 V. The TUSB320 device can be run off of a

system power such as a battery.

TUSB320LI Datasheet(PDF) 28 Page - Texas Instruments