Texas Instruments TMUXRTJ-RRQEVM, User Manual

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As shown in Figure 6-2 and Figure 6-3 as R5 and R6 on the J1 (pin 1 of U1) signal line, the TMUXRTJ-
RRQEVM includes 0 Ω series resistors (0805 package) on each signal line.
Figure 6-3. Signal Line Circuitry
These can be substituted for different resistors as desired. Additionally, there are pads for pull-up and pull-down
resistors to V
DD
and GND respectively. Add any 0603 resistor to the footprint shown here as R1 to provide
pull-up to V
DD
, and add any 0603 resistor to the footprint shown here as R13 to provide pull-down to GND.
Each signal line also includes two footprints that allow for the user to attach capacitors or other devices with
matching footprints. On the top side of the board, shown in
Figure 6-2 and Figure 6-3 as C1, a standard 1206
footprint exists between the U1 pin signal and the GND signal. The user can solder a capacitor to this footprint to
provide capacitance to the signal line.
Figure 6-4. Signal Line Circuitry Bottom Layer
Figure 6-4 shows that a standard 1812 footprint exists as C101 on the backside of the board, which also allows a
capacitor to be connected between the U1 pin signal and GND. The user can solder a capacitor to this footprint
to provide capacitance to the signal line.
The user can select the connection of the thermal pad of U1 by using the three-by-one header located near U1
(J21).
Setup www.ti.com
12 TMUXRTJ-RRQEVM User's Guide SCDU027 – AUGUST 2021
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