3.1.11.3 Alternate Power
Additional jumpers are provided outside of the BoosterPack connector for additional external power connections
for 3.3 V or 5 V. These can be used to supply an external board or for powering the LaunchPad with an external
supply. When using these connection points, ensure that no other power supplies are connected.
•
JP4 and JP6
are provided as extra connection points for a 3.3 V supply to be connected to the LaunchPad.
•
JP5 and JP7
are provided as extra connection points for a 5 V supply to be connected to the LaunchPad.
3.2 Debug Interface
3.2.1 XDS110 Debug Probe
The F28003x LaunchPad includes an on-board XDS110 Debug Probe. The XDS110 allows for the programming
and debugging of the F280039C using
, or any other supported tool chains. In the
default configuration, the XDS110 is only wired to support 2-pin cJTAG mode. This uses only the TMS and TCK
JTAG pins and allows the TDI and TDO pins of the F28003x device to be reallocated for otherapplication needs.
TDI and TDO are available on GPIO35 and GPIO37. These pins are not routed to the debug probe by default,
but can be connected by populating resistors R44 and R45.
3.2.2 XDS110 Output
The connector J102 is provided to debug an external target with the on-board XDS110 debug probe. This
connector allows the LaunchPad to be used as a stand-alone XDS110 debug probe. For mating connector and
cable see
If the LaunchPad is being used in this manner, ensure that all of the jumpers are removed from J101. This
isolates the JTAG signals from going to the F280039C MCU. UART TX and RX signals from the XDS110 device
are also included on this connector.
3.2.3 Virtual COM Port
When plugged into a USB host, the XDS110 enumerates as both a debugger and a virtual COM port. J101
allows the user to connect the SCI UART from the F280039C to the debug probe to be passed on to the USB
host. By default the F28003x SCIA maps to the virtual COM port of the XDS110 using GPIO28 and GPIO29.
Alternately, GPIO15 and GPIO56 can be used for SCIB. This is accomplished by manipulating the on-board
switch S2. For the appropriate switch settings, see
.
3.3 Alternate Routing
3.3.1 Overview
The F280039C MCU is a very versatile device in a mid-size package. To balance compatibility with BoosterPack
standards, as well as showcasing the versatility of the F280039C, some complexity was added to the design.
Most features aligning with the BoosterPack standard are available by default. The additional functions are
configured using switches or static resistors which can be added or removed. This section covers the alternate
functions and how to enable them. Note that by enabling certain alternate features, standard BoosterPack
functionality may be lost. The switches and resistors are configured such that it is not possible to connect
multiple functions to the same header.
3.3.2 UART Routing
This LaunchPad allows for one of two sets of pins to be used for the SCIA UART routed to the virtual COM port
of the XDS110. By default, GPIO28 (SCIA_RX) and GPIO29 (SCIA_TX) are routed to the virtual COM port and
not available on the BoosterPack connector. Alternately, GPIO15 (SCIB_RX) and GPIO56 (SCIB_TX) can be
routed to the virtual COM port. When UART functionality is not needed at the virtual COM port, the GPIOs can
be routed to the BoosterPack connectors for BoosterPack standard functions.
Hardware Description
14
C2000
™
F28003x Series LaunchPad
™
Development Kit
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