Texas Instruments CC3235MODASF, User Manual

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The OPAMP EN and LED EN jumpers are also available to remove any current draw from the onboard OpAmp
and LEDs being driven by the GPIOs, see
Table 2-2 .
Table 2-2. External Supply Connections and Enable Jumpers
Reference Use Comments
J19 5-V power input Used to power the board from an external 5-V supply
J20 3.3-V power input Used to power the board from an external 3.3-V supply.
J21 OPAMP EN If uninstalled, the power supply to the operational amplifier is cut off. This can be
used to enable low-power measurements.
J26 LED EN If uninstalled, the LEDs connected to the GPIO are disabled; this can be used to
enable low-power measurements.
2.2.8 Reset Pullup Jumper
Table 2-3 lists the reset pullup jumper.
Table 2-3. Reset Pullup Jumper
Reference Use Comments
J13 RESET pullup Install this jumper to enable the pullup resistor on the nRESET pin of the device,
when the board is powered from an external supply.
2.2.9 Clocking
All of the required clocks are inside the module. There is no need to supply any external clock.
2.2.10 I
2
C Connection
The board features an accelerometer and a temperature sensor for the out-of-box demo. These are connected
to the I
2
C bus, and can be isolated using the jumpers provided (shown as yellow jumpers J23 and J24 in Figure
2-12 ).
Figure 2-12. I
2
C Connections
By removing J23 and J24, the accelerometer and the temperature sensors are isolated from the I
2
C bus. This
measure also removes the I
2
C pullup resistors from the sensor side of the circuit, and therefore any connection
to the circuit requires the user to install external pullup resistors.
Table 2-4 lists the I
2
C jumper definitions.
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24 CC3235MODSF SimpleLink™ Wi-Fi
®
and IoT Solution With MCU
LaunchPad™ Hardware
SWRU548C – FEBRUARY 2019 – REVISED SEPTEMBER 2021
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