SLLSEO6C June 2015 – August 2018 TUSB321
The TUSB321 device has the ability to control an external/discrete MUX using the DIR pin. The TUSB321 detects the cable orientation by monitoring the voltage on the CC pins. When a voltage level within the proper threshold is detected on CC1, the DIR pin is pulled low. When a voltage level within the proper threshold is detected on CC2, the DIR is pulled high. If the direction polarity of the external MUX is opposite of the TUSB321, the TUSB321 CC1/CC2 connection to USB Type-C receptacle can be reversed. The DIR pin is an open drain output.