IGEP
TM
SMARC iMX6
Hardware Reference Manual
ISEE 2007 S.L. All rights reserved, IGEP is a registered trademark from ISEE 2007 S.L. The following is provided for informational purposes only.
NIF:ESB64377005 Document:
MAN-IGEP0046-001
/ Revision:
1.3
/ Date:
23/06/2016
20
The USB0_EN_OC# (P62) and USB1_EN_OC# (P67) are, in both cases, optional pins used to detect if there
has been an over-consumption (for example a short-circuit). Although in the second example these references
are used, it’s possible to apply any other of the free GPIO pins if the user wants to implement this feature.
It must be respected a 90Ω (+/-15%) differential impedance in the layout traces when the base board will be
designed. At the same time, the traces have to be equal length and symmetric, with regards of shape, length
and via count. The differential pairs must be isolated from nearby signals and circuitry to maintain the signal
integrity.
To protect the VBUS against overcurrent, the USB power source current have to be less or equal than 500mA,
and the user must provide a protection in the base board as it is showed into Figure 12 USB 2.0 Host
connections and Figure 13 MicroUSB AB 2.0 OTG connections examples..
The following table offers the list in the SMARC-314 related pins with both of USB connections.
Pin
Volt
Level
Dev
Pin
Main Function
Main
MUX
Type
Fixed
Function
Comments
USB HOST
P65
DIF
E10
USB1+
0
USB2.0
YES
Analog D+ data pin of the USB1
P66
DIF
F10
USB1-
0
USB2.0
YES
Analog D- data pin of the USB1
P67
3V3
R6
USB1_EN_OC#
5
IO
YES
Active Low. Over current Indication to module. This signal has a
3K3 PU resistor.
USB OTG
P60
DIF
A6
USB0+
0
USB2.0
YES
Analog D+ data pin of the USB0
P61
DIF
B6
USB0-
0
USB2.0
YES
Analog D- data pin of the USB0
P62
3V3
R4
USB0_EN_OC#
5
IO
YES
Active Low. Over current Indication to module. This signal has a
3K3 PU resistor.
P63
5V
E9
USB0_VBUS_DET
0
USB
YES
USB host power detection, when this port is used as a device
P64
1V8
W23
USB0_OTG_ID
0
IN
YES
USB OTG ID input, active high
Table 9 USB pins
