Texas Instruments SimpleLink Wi-Fi BoosterPack CC3120, Руководство пользователя

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Hardware Description
9 SWRU457A – February 2017 – Revised August 2018
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CC3120 SimpleLink™ Wi-Fi
®
BoosterPack™ Plug-In Module and IoT
Solution
2.4 Power
The board is designed to accept power from a connected LaunchPad kit, or through the
CC31xxEMUBOOST board. Some LaunchPad kits cannot source the peak current requirements of Wi-Fi,
which may be as high as 400 mA. In such cases, the USB connector on the CC3120BOOST can be used
to aid the peak current. The use of Schottky diodes ensure that load sharing occurs between the USB
connectors on the LaunchPad kit and the BoosterPack module without any board modifications.
Also, the 3.3-V power can be sourced from the LaunchPad kit or from the 3.3-V LDO on the board. This
sourcing is done by using jumper J8. If the LaunchPad kit is unable to source the 3.3 V up to 350 mA,
then J8 must be configured to work from the onboard LDO.
2.4.1 Power From the LaunchPad Kit or CC3120EMUBOOST
The most common scenario is powering the CC3120BOOST from the connected LaunchPad kit. In this
case, the LaunchPad kit provides 3.3 V to the BoosterPack module for its operation (see
Figure 5 ). In
addition to the 3.3 V, some LaunchPad kits provide 5 V from the USB (see Figure 6 ), which is used to
drive a 3.3-V LDO on the BoosterPack module. If the LaunchPad kit is unable to provide the 5 V (for
example, the LaunchPad kit with only 20 pins), then the USB connector on the CC3120BOOST must be
used to provide the LDO input, as shown in
Figure 6 .
Figure 5. 3.3-V Power From MCU LaunchPad Kit