User manual

4
5.1 Power
5.1.1 External Power
Power to the UT200SpW4RTR-EVB may be provided externally using the three BNC connectors. 5.0V,
3.3V and 2.5V must be provided to the board. In order to use external power provided by the BNC
connectors the user must jumper J57, J58, and J59. These jumpers ensure that external power is flowing to
the board. Ensure that Jumpers J64 and J65 are removed!
To avoid large surge currents in the UT200SpW4RTR device, VDD = 3.3V (J57) should be powered up
either before VDDC = 2.5V (J59) or synchronously with VDDC (VDD > VDDC). DO NOT power up the
core voltage supply VDDC before the I/O supply VDD; doing so causes a large in-rush current from
VDDC to VDD that stresses the power supplies and router components. If VDD and VDDC are being
powered up synchronously ensure that the voltage difference between VDDC and VDD does not exceed
0.4V (VDDC - VDD < 0.4V). See AC Electrical Characteristics in the UT200SpW4RTR datasheet for
specifics.
UT200SpW4RTR
4-Port Router
UT54LVDS031LV
J
U
M
P
E
R
J
UM
P
E
R
J
U
M
P
E
R
Figure 2. External Power Jumper Configuration Settings