TUSB322I datasheet(28/37 Pages) TI1

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TUSB322I

SLLSEO5 – OCTOBER 2015

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8.3 Initialization Set Up

The general power-up sequence for the TUSB322I device (EN_N tied to GND) is as follows:

1. System is powered off (device has no VDD). The TUSB322I device is configured internally in UFP mode with

Rds on CC pins (dead battery).

2. VDD ramps – POR circuit.

3. I2C supply ramps up.

4. The TUSB322I device enters unattached.SNK and functions as a DRP. If DRP is not the desired mode of

operation, then software must change MODE_SELECT register to desired mode (UFP or DFP).

5. The TUSB322I device monitors the CC pins as a DFP and VBUS for attach as a UFP.

6. The TUSB322I device enters active mode when attach has been successfully detected.

9 Power Supply Recommendations

The TUSB322I device has a wide power supply range from 4.5 to 5.5 V. The TUSB322I device can be run off of

a system power such as a battery.

10 Layout

10.1 Layout Guidelines

1. An extra trace (or stub) is created when connecting between more than two points. A trace connecting pin A6

to pin B6 will create a stub because the trace also has to go to the USB Host. Ensure that:

–

A stub created by short on pin A6 (DP) and pin B6 (DP) at Type-C receptacle does not exceed 3.5 mm.

–

A stub created by short on pin A7 (DM) and pin B7 (DM) at Type-C receptacle does not exceed 3.5 mm.

2. A 100-nF capacitor should be placed as close as possible to the TUSB322I VDD pin.

10.2 Layout Example

Figure 14. TUSB322I Layout

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TUSB322I Datasheet(PDF) 28 Page - Texas Instruments