Power Management

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SPMU365C – March 2014 – Revised October 2016

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Hardware Description

2.1.6.4

Other Headers and Jumpers

JP1 is provided to select the power input source for the Connected LaunchPad. The top position is for

BoosterPack power; this position also disconnects both USB voltages from the board’s primary 5-volt

input. In the top position, the TPS2052B does not limit current so additional care should be exercised. The

middle position draws power from the USB connector on the left side of the board near the Ethernet jack.

The bottom position is the default, in which power is drawn from the ICDI (Debug) USB connection.

JP2 separates the MCU 3.3-volt power domain from the rest of the 3.3-volt power on the board allowing

an ammeter to be used to obtain more accurate measurements of microcontroller power consumption.

JP3 isolates the output of the TPS73733 LDO from the board’s 3.3-V power domain.

JP4 and JP5 are used to configure CAN signals to the BoosterPack 2 interface. In the default horizontal

configuration, CAN is not present on the BoosterPack. UART2 goes to the BoosterPack and UART 0 goes

to the ICDI virtual serial port to provide ROM serial bootloader capability. In the vertical CAN-enabled

configuration, UART2 goes to the ICDI virtual serial port and CAN signals are available on the

BoosterPack. The ROM serial bootloader is not available to the ICDI virtual serial port while the jumpers

are in the CAN position.

Figure 2-2 shows the default configuration and relative location of the jumpers on the board.

Figure 2-2. Default Jumper Locations

2.2

Power Management

2.2.1 Power Supplies

The Connected LaunchPad can be powered from three different input options:

•

On-board ICDI USB cable (Debug, Default)

•

Target USB cable

•

BoosterPack or Breadboard adapter connection

The JP1 power-select jumper is used to select one of the power sources.

In addition, the JP3 power jumper can be used to isolate the 3.3-volt output of the TPS73733 from the

board’s 3.3-volt rail.

A TPS2052B load switch is used to regulate and control power to the Target USB connector when the

microcontroller is acting in USB host mode. This load switch also limits current to the BoosterPack and

Breadboard adapter headers when the JP1 jumper is in the ICDI position.