Datasheet

www.ti.com

Hardware Configuration

5.1 Power Domain

The F28069M LaunchPad has several different power domains to enable JTAG isolation. Jumpers JP1,

JP2, JP3, JP4, and JP5 configure where power is passed.

Jumper Power Domain

JP1 Enable 3.3 V from USB (disables isolation)

JP2 Enable GND from USB (disables isolation)

JP3 Enable 5 V switcher (powered off 3.3 V supply of target device)

JP4 Connects target MCU 3.3 V to second set of BoosterPack

headers

JP5 Connects target MCU 5 V to second set of BoosterPack headers

5.2 Serial Connectivity

The LAUNCHXL-F28069M has a USB to UART adapter built in. This makes it easy to print debug

information back to the host PC even in isolated environments. The F28069M device on this LaunchPad

contains two SCI (UART) peripherals, while the LaunchPad has three places these peripherals need to be

routed. Because of this, a serial connectivity mux has been added to the board to make configuration of

the SCI routing easy. Routing is configured via two jumpers (JP6 and JP7). Configure the jumpers as

shown in Table 1 for the serial connectivity you desire.

Table 1. Serial Connectivity

MUX_SEL CH_SEL(JP

(JP7) 6) Function

ON ON USB/UART Disabled; J1.3 and J1.4 – GPIO28 and GPIO29; J7.3 and J7.4 – GPIO15 and GPIO58

ON OFF USB/UART – GPIO28 and GPIO29, J1.3 and J1.4 – Hi-Z; J7.3 and J7.4 – GPIO15 and GPIO58

OFF ON USB/UART – GPIO15 and GPIO58; FAULT/OCTW – GPIO28 and GPIO29; J7.3 and J7.4 – Hi-Z

OFF OFF USB/UART – GPIO15 and GPIO58; FAULT/OCTW – GPIO28 and GPIO29; J7.3 and J7.4 – Hi-Z

5.3 Boot Mode Selection

The LaunchPad's F28069M device includes a boot ROM that performs some basic start-up checks and

allows for the device to boot in many different ways. Most users will either want to perform an emulation

boot or a boot to flash (if they are running the application standalone). S1 has been provided to allow

users to easily configure the pins that the bootROM checks to make this decision. The switches on S1

correspond to:

Switch Function

1 GPIO34

2 GPIO37

3 TRSTn

Keep in mind that the debugger does not connect if the device is not in the emulation boot mode (TRST

switch in the up position). More information about boot mode selection can be found in the Boot ROM

section of the TMS320x2806x Piccolo Technical Reference Guide (SPRUH18).

5.4 Connecting a Crystal

Although the Piccolo device present on the LAUNCHXL-F28069M has an internal oscillator — and for

most applications this is sufficient — the LaunchPad offers a footprint for through-hole HC-49 crystals for

users who require a more precise clock. If you wish to use an external crystal, solder the crystal to the Q1

footprint and appropriate load capacitors to the C3 and C4 footprints. You also need to configure the

device to use the external oscillator in software.

SPRUI11–January 2015 LAUNCHXL-F28069M Overview

Submit Documentation Feedback