...........continued
Pin No
Mnemonic
Signal Description
12
GK
Green LED cathode (Not connected)
SHD
EARTH
GROUND
3.4.6.2
USB Interfaces
The USB (Universal Serial Bus) is a hot-pluggable general-purpose high-speed I/O standard for computer
peripherals. The standard defines connector types, cabling, and communication protocols for interconnecting a wide
variety of electronic devices. The USB 2.0 Specification defines data transfer rates as high as 480 Mbps (also known
as High-Speed USB). A USB host bus connector uses four pins: a power supply pin (5V), a differential pair (D+ and
D- pins) and a ground pin.
The ATSAMA5D27-WLSOM1-EK1 features three USB communication ports named USB-A to USB-C:
• USB-A device interface
– One USB device standard Micro-AB connector
– Offers a VBUS detection function through the R81-R83 resistor ladder
– Used as a secondary power source and as a communication link for the ATSAMA5D27-WLSOM1-EK1, and
derives power from the PC over the USB cable. In most cases, this port is limited to 500 mA.
• USB-B (host port B high- and full-speed interface)
– One USB host type C connector
– Equipped with a 500 mA high-side power switch
• USB-C (High-Speed Inter-Chip/HSIC port)
– One USB high-speed host port with an HSIC interface
– Connected to 2 U.FL connectors
3.4.6.3
USB-A Interface
The figure below shows the USB implementation on the USB-A port terminated on a Micro-AB type USB connector.
Figure 3-14. USB-A Device Interface Schematic
USBA_N
USBA_P
GND
EARTH_USB_A
ID
4
VBUS
1
GND
5
D-
2
D+
3
0
0475890001
CON USB2.0 MICRO-AB FEMALE SMD R/A
J10
20pF
50V
0402
C6
VBUS_USBA
GND
200k
0402
1%
R86
100k
0402
R85
GND
0.1uF
10V
0402
C7
GND
USB_DETECT_PA16
USBA
120R
BLM18PG121SN1D
FB1
DIFF90
DIFF90
90Ω ±10% differential trace impedance
Routing top or bottom
ATSAMA5D27-WLSOM1-EK1
Baseboard Components
©
2019 Microchip Technology Inc.
User Guide
DS50002931A-page 17
