28

TUSB320LAI, TUSB320HAI

SLLSEQ8D – OCTOBER 2015 – REVISED MAY 2017

www.ti.com

Product Folder Links: TUSB320LAI TUSB320HAI

Submit Documentation Feedback

Copyright © 2015–2017, Texas Instruments Incorporated

8.3 Initialization Setup

8.3.1 TUSB320LA Initialization Procedure

1. System is powered off (device has no VDD). The TUSB320LA 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 TUSB320LA device enters unattached mode and determines the voltage level from the PORT pin. This

determines the mode in which the TUSB320LA device operates (DFP, UFP, DRP).

5. The TUSB320LA device monitors the CC pins as a DFP and VBUS for attach as a UFP.

6. The TUSB320LA device enters active mode when attach has been successfully detected.

8.3.2 TUSB320HA Initialization Procedure

1. System is powered off (device has no VDD). The TUSB320HA 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 TUSB320HA device enters unattached mode and determines the voltage level from the PORT pin. This

determines the mode in which the TUSB320HA device operates (DFP, UFP, DRP).

5. The TUSB320HA device monitors the CC pins as a DFP and VBUS for attach as a UFP.

6. The TUSB320HA 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.