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© 2021 ROHM Co., Ltd.
No. 64AN082E Rev.001
Oct. 2021
Application Note
USB Type-C Sink Port Detection and Protection IC
BD91N01NUX Function Description
This product is a USB Type-C detection IC that is compatible with USB Type-C Rev2.1 standard for applications
which require to sink power. When a Type-C plug is inserted, the product enters stand-alone operation where it
supplies power from VBUS to the system. Through this product, a Type-C interface can be introduced to receive
voltage and current of up to 5V/3A which is the Type-C standard.
It can be used in applications that operate up to 15W of power, allowing the user to combine the ports of applications
that had separate traditional power like USB Standard/Micro/Mini B ports.
Specification Description
This product is dedicated for the Sink application. When
a Source device is connected via Type-C, a series of
operations are performed; the product operates through
the VBUS power, then detects the orientation of Type-
C, insertion and removal detection, then selects the
USB Type-C current. The connection status is relayed
to the system via output terminals. When a Type-C
connection is detected, the Pch-MOS FET in the VBUS
power line turns ON, supplying power to the system.
The status of the Type-C connection can be monitored
by checking each digital output using an MCU. Since the
product does not have an input setting terminal,
configuring the MCU is not required.
The Pch-MOS FET on the VBUS power line
automatically turns off when Source device is
disconnected.
[Power Supply Specification]
●VBUS =4.0 to 5.5V
●VDDIO =1.7 to 5.5V
[Type-C Connection specification]
●SNK / UFP
[SNK (Power Sink) Specification]
●Inform the system of the Type-C connection condition
via both TCC1 and TCC0.
[Protection Function specification]
●VBUS Over Voltage protection
●VBUS Under Voltage Lockout
[Digital Output terminals]
The following features are assigned to digital output
terminals.
Table 1. Digital output terminals
Terminal #
Name
Output
Voltage
Level
Features
6
TCC1
VDDIO
The 2-bit data of
Type-C current
capability
7
TCC0
VDDIO
8
ORIENT
VDDIO
Plug Orientation
9
SWMONI
VDDIO
Status of external
Pch-MOS FET
Note: All digital terminals have NO pull-down or pull-
up.
Unsupported Features
Table 2 lists the following features which the product
does not support since it only supports Type-C Sink
and UFP. Please check our USB PD controllers if the
following listed features are needed.
Table 2. Features not supported by BD91N01NUX
Unsupported features
OTG
Power Delivery
Dual Role Power Port
Power Role Swap
Dual Role Data Port
Data Role Swap
Source
PPS
DFP
Fast Role Swap
BC1.2
VBUS OCP
Sink that requires over 15W Sink that requires over 5V
