Texas Instruments SRC4194EVM, User Manual

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Power Supply Configuration
3-2
3.1 Power Supply Configuration
Changes to settings for jumpers J15 through J17, as well as
changes to the state of the REGEN element of switch SW2, should
be performed with all power supplies connected to terminal block
J14 powered off, thereby avoiding potential damage to the EVM and
external components.
The SRC4194EVM provides several options for power-supply configuration
using onboard regulators and/or external supplies. Onboard jumpers and a
switch are used to select the available options. Figure 3−1 illustrates the EVM
power-supply configuration using jumpers J15 through J17 and terminal block
J14. Table 3−1 summarizes the common jumper configurations based upon
a setup using a +5V supply and an optional EXT VIO supply.
Figure 3−1. SRC4194EVM Power Supply Configuration and Jumpers
+5V GND GND +1.8V +3.3V
EXT
VIO
EXT
VIO
EXT
+1.8V
EXT
+3.3V
+5V
REG +3.3V
U33
U32
+3.3V
REG
+1.8V
REG
REG +1.8V
REG +1.8V
REG +3.3V
VIO
6 5
4 3
2 1
J14
J15
REG +3.3V
VDD33
J16
REG +1.8V
EXT +1.8V
EXT +3.3V
EXT VIO
VDD18
J17
NC
(1)
NC
(1)
NOTE: (1) NC = not connected.
Referring to Figure 3−1, the SRC4194EVM includes two onboard linear volt-
age regulators, U32 and U33, which are used to 1.8V and +3.3V from
a 5V external power supply. The outputs of the two regulators may be
connected to the onboard VDD18, VDD33, or VIO power busses using jump-
ers J15 through J17. The jumpers also allow for connection to external power
supplies using terminal block J14.
Table 3−1 summarizes five common supply configurations for the
SRC4194EVM. Jumper settings for J15 through J17 are indicated, as well as
the state of the REGEN element of switch SW2. The user is reminded to power
down all supplies connected to terminal block J14 of the EVM before changing
the jumper and switch configurations.