SBC-C20
SBC-C20 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by C.M. -Copyright © 2020 SECO S.p.A.
28
The second USB native port is carried to a Microchip USB2514 USB 2.0 Hub, factory optional, which can make available four further USB 2.0 Host ports .
When the USH Hub is mounted, then two standard USB 2.0 Host ports are
available on connector, CN22, which is a standard double USB Type A socket,
shielded.
In case that the USB Hub is not mounted, then on this connector only the upper
port will work, directly connected to the i.MX 8M native USB 2.0 Host port #2.
Since this connector is a standard type-A receptacle, it can be connected to
all types of USB 1.1 / USB 2.0 devices using standard-A USB 2.0 plugs.
Signals description:
/USB_P3-: USB Port #3 differential pair; it can be managed by the i.MX 8M native USB
2.0 Host port #2 or by the
/USB_P4-: USB Port #4 differential pair; it is managed by SMSC USB2514 Hub contro
+5V
USB3
and +5V
USB4
voltages are derived from +5V_ALW power rail using a 500mA Dual-Channel power switch.
Internal USB header
As a factory option, it is possible to provide SBC-C20 board with an internal connector designed specifically
for connection of devices requiring an additional reset signal, like i.e. USB Touch Screen controllers-
In case that this connector is mounted, then the USB 2.0 Port #3 of connector CN22 will be not working.
The optional USB Internal header is CN37, which is a 5-pin male connector, type HR p/n A2001WV-S-5P with pinout shown
in the table on the left.
Mating connector: HR A2001H-05P housing with HR A2001 series crimp terminals.
Signal description:
USB_IH_DN / USB_IH_DP: internal header s USB port differential pair, it is managed by the optional SMSC USB2514 Hub
USB_IH_RST: This signal can be used to drive the reset of an eventual external device connected to CN37. VDD_3P3V electrical level output.
Dual USB 2.0 type A CN22
Pin
Signal
Pin
Signal
1
+5V
USB3
5
+5V
USB4
2
USB_P3-
6
USB_P4-
3
7
4
GND
8
GND
Internal USB Header CN37
Pin Signal
1
VBUS_HOST3
2
USB_IH_DN
3
USB_IH_DP
4
GND
5
USB_IH_RST
