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User’s Guide
USB port power enable and over current logic implementation between the CPLD and SMARC sAT30 edge connector is
shown in the table below:
CPLD
SMARC sAT30 Edge Finger
Net Name
Notes
Pin #
Pin Name
Pin #
Pin Name
L9
IO_L9
P62
USB0_EN_OC#
EN_USB0_VBUS_OC#
USB Port0 power enable/over
current indication signal
K9
IO_K9
P67
USB1_EN_OC#
EN_USB1_VBUS_OC#
USB Port1 power enable/over
current indication signal
L10
IO_L10
P71
USB2_EN_OC#
EN_USB2_VBUS_OC#
USB Port2 power enable/over
current indication signal
Power distribution for external USB plug-in peripherals (USB memory sticks, cameras, keyboards, mice, etc.) is
typically handled by USB power switches such as the Texas Instruments TPS2052B, Micrel MIC2026-1 or similar devices
on the Carrier board. The Enable pin on the Carrier board USB power switch must be active – high and the Over-Current
pin (OC#) must be open drain, active low (these are commonly available). No pull-up is required on the USB power
switch Enable or OC# line; they are tied together on the Carrier and fed to the Module USBx_EN_OC# pin. The pull-up is
on the Module.
SMARC CARRIER MXM3
CONNECTOR
(J40)
5V
USBx_EN_OC#
Switched
Pwr
Pwr
USBx_VBUS
Enable
TPS2052B
OC#
Figure 5: USB Power Distribution Implementation on Carrier
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