Texas Instruments SimpleLink LaunchPad CC3235MODSF User Manual page 24

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