SPRUII7B June   2018  – April 2020 TMS320F280040-Q1 , TMS320F280040C-Q1 , TMS320F280041 , TMS320F280041-Q1 , TMS320F280041C , TMS320F280041C-Q1 , TMS320F280045 , TMS320F280048-Q1 , TMS320F280048C-Q1 , TMS320F280049 , TMS320F280049-Q1 , TMS320F280049C , TMS320F280049C-Q1

 

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2.1.9.1 USB Isolation Block

JP1, JP2, and JP3 are provided to enable isolation between the device and the connected USB in high-voltage applications. The area of isolation is defined by the white outline in the upper-left corner of the LaunchPad. JP1 separates the GND of USB region and the MCU region of the LaunchPad. JP2 separates 3.3 V, and JP3 separates 5 V. By default, all three jumpers are shorted and the power is supplied by the connected USB, meaning that the USB is NOT isolated from the MCU region. If power isolation is desired, remove the supplied shunts from JP1, JP2, and JP3. In this configuration, a 3.3 V supply must be connected to the MCU region to power the F280049C MCU and the other on-board circuitry, including the XDS110 debug probe. Some applications may not require 5 V to be supplied to the MCU region. In an isolated power application with JP3 removed, supplying 5 V to the MCU region is optional.