1 Features
• USB Type-C™ Specification 1.1
• Backward Compatible with USB Type-C
Specification 1.0
• Supports Up to 3 A of Current Advertisement
through dedicated Current Mode pin
• Mode Configuration
– Host Only – DFP (Source)
– Device Only – UFP (Sink)
– Dual Role Port – DRP
• Channel Configuration (CC)
– Attach of USB Port Detection
– Cable Orientation Detection
– Role Detection
– Type-C Current Mode advertisement and
detection (Default, Medium, High)
• VBUS Detection
• VCONN Support for Active Cables
• Cable Detection and Direction Control
for External Switches
• Supply Voltage: 4.5 V to 5.5 V
• Low Current Consumption
• Industrial Temperature Range of –40 to 85°C

2 Applications
• Host, Device, Dual Role Port Applications
• Mobile Phones
• Tablets and Notebooks
• USB Peripherals

3 Description
The TUSB321AI device enables USB Type-C ports
with the configuration channel (CC) logic needed for
Type-C ecosystems. The TUSB321AI device uses
the CC pins to determine port attach and detach,
cable orientation, role detection, and port control for
Type-C current mode. The TUSB321AI device can be
configured as a downstream facing port (DFP),
upstream facing port (UFP) or a dual role port (DRP)
making it ideal for any application.
The TUSB321AI device when configured as a DRP
alternates configuration as a DFP or UFP according
to the Type-C Specifications. The CC logic block
monitors the CC1 and CC2 pins for pullup or
pulldown resistances to determine when a USB port
has been attached, the orientation of the cable, and
the role detected. The CC logic detects the Type-C
current mode as default, medium, or high depending
on the role detected. VBUS detection is implemented
to determine a successful attach in UFP and DRP
modes.
The device operates over a wide supply range and
has low-power consumption. The TUSB321AI device
is available in industrial and commercial temperature
ranges.