Table 3-24. USBA Power Switch PIO Signal Descriptions
PIO
Signal Name
Shared
Signal Description
PB2
USBA_EN_5V_PB2
–
Power switch enable (active high)
PC7
USBA_OVCUR_PC7
–
Indicates overcurrent (open drain)
3.4.2.2
USBB Host Interface
The USBB port can act as a USB device or USB host interface and can be accessed via the USB Type-C connector
(J8).
Two resistors (R192 and R193) are placed on its power rail to form a voltage divider, converting 5V into 3.3V voltage
that is then used to indicate the presence of a USB host to the MPU (USBB_VBUSDETECT_PC12).
Figure 3-35. USB-B Port Schematic
GND
GND_USBB
GND
GND
GND
USBB_VBUS_5V
USBB_VBUS_5V
USBB_VBUS_5V
USBB_VBUS_5V
USBB_N
USBB_P
USBB_CC2
USBB_CC1
USBB_P
USBB_N
USB-C type connector to the USBB port (HOST/DEVICE)
120R
BLM18PG121SN1D
FB12
GND
B1
VBUS
B4 CC2
B5 D+
B6 D-
B7 SBU2
B8 VBUS
B9
GND
B12
SHIELD 25
GND A1
VBUS A4
CC1 A5
D+ A6
D- A7
SBU1 A8
VBUS A9
GND A12
USB 2.0 type C
USB2.0 Type-C FEMALE
J8
DIFF90
DIFF90
DIFF90
DIFF90
470pF
50V
0402
C208
GND
470pF
50V
0402
C201
20k
0402
1%
R193
GND
USBB_VBUSDETECT_PC12
10k
0402
1%
R192
0R
0603
R191
USB_VBUS_5V
90
Ω
±15% differential trace impedance
Routing top or bottom
Table 3-25. USB-B J8 Connector Signal Descriptions
Signal Description
Signal Name
Pad Name Pin No. Pin No. Pad Name Signal Name
Signal Description
Ground
GND
GND
A1
B1
GND
GND
Ground
Not used
Not connected
TX1+
A2
B2
TX2+
Not connected
Not used
Not used
Not connected
TX1-
A3
B3
TX2-
Not connected
Not used
Port-B 5V power
USBB_VBUS_5V
VBUS
A4
B4
VBUS
USBB_VBUS_5V Port-B 5V power
Sideband use
USBB_CC1
CC1
A5
B5
CC2
USBB_CC2
Configuration channel
Port-B data plus
USBB_P
D+
A6
B6
D+
USBB_P
Port-B data plus
Port-B data minus
USBB_N
D-
A7
B7
D-
USBB_N
Port-B data minus
Not used
SBU1
SBU1
A8
B8
SBU2
SBU2
Not used
Port-B 5V power
USBB_VBUS_5V
VBUS
A9
B9
VBUS
USBB_VBUS_5V Port-B 5V power
Not used
Not connected
RX2-
A10
B10
RX1-
Not connected
Not used
Not used
Not connected
RX2+
A11
B11
RX1+
Not connected
Not used
Ground
GND
GND
A12
B12
GND
GND
Ground
Table 3-26. USB-B PIO Signal Description
PIO
Signal Name
Shared
Signal Description
PC12
USBB_VBUSDETECT_PC12
–
VBUS detection
In Host mode, the USB Host port B is equipped with 500-mA high-side power switches to enable self-powered
and bus-powered applications. The USBB_EN_5V_PC11 signal controls the current limiting power switch MIC2025,
which in turn supplies power to a client device. As per the USB specification, bus-powered USB 2.0 devices are
SAMA7G54-EK
Function Blocks
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2022 Microchip Technology Inc.
and its subsidiaries
User Guide
DS50003273A-page 45
