U E Z G U I - 1 7 8 8 - 7 0 W V M
U s e r ’ s M a n u a l
P a g e
|
27
3/20/2024
Copyright ©2024, Future Designs, Inc
Revision 5
level retains the specified tolerance. If the µEZ GUI input level drops to 4.75VDC, then the µEZ GUI +5VDC output
level to either the Expansion Board or the USB Host connector may be lower than 4.75VDC since the worst case
drop from input to output is typically 0.25V.
•
For reference on the USB output port from the µEZ GUI, the following are the specifications:
o
USB High Power Specifications are 500mA maximum, and 4.75V to 5.25V standard.
o
USB Low Power Specifications are 100mA maximum, and 4.4V to 5.25V standard.
•
The µEZ GUI is capable of providing a maximum of 100mA of 3.3V power
for “external use”
over the
expansion connectors. If more than 100mA of 3.3V is needed for an expansion board:
o
Then the primary power input (i.e. 5V) should be located on the expansion board rather than on the
µEZ GUI.
o
The expansion board should be designed with a separate 3.3V voltage regulator.
o
Ensure the 3.3V voltage rails of the µEZ GUI & Expansion Board are not connected together.
o
The µEZ GUI should be powered using 5V from the Expansion Board over the 70 pin breakout,
instead of powering the Expansion Board from the µEZ GUI unit.
•
The UEZGUI-1788-70WVM may also optionally be powered via the following connectors;
o
Alternate Power/Communication Connector, J11, with a maximum of 2A 5V input
o
Expansion Connector(s) J4 and/or J5
–
refer to the expansion connector section for details
