Texas Instruments EK-TM4C1294XL 사용자 설명서
Power Management
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.
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.
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. UART 4 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, UART 4 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.
configuration, CAN is not present on the BoosterPack. UART 4 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, UART 4 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.
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.
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.
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.
17
SPMU365A – March 2014 – Revised March 2014
Hardware Description
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