Hardware Description
8
SLLU250 – November 2016
Copyright © 2016, Texas Instruments Incorporated
BOOSTXL-RS232 BoosterPack™ Hardware
3.5
Header Descriptions
3.5.1
Using J5, J6 and J7, J8 GPIO Headers
The J5, J6 and J7, J8 10 × 3 headers are for assigning the TRS3122E UART Drivers or Receivers
(labeled as CTS2, RX2, RTS2, and TX2 on the BoosterPack) to various LaunchPad GPIOs. The default
jumper setup has TX2, RX2, RTS2, and CTS2 assigned to LaunchPad GPIO pins GP3, GP4, GP5, and
GP8, respectively. TI recommends tying TX2 and RX2 to GP3 and GP4, respectively, since GP3 and GP4
are typically the UART transmit and receive ports on TI LaunchPads, this is not required but should be
kept in mind. RTS2 and CTS2 can be connected to any desired GPIO pin.
Each pin of the middle column of the 10 × 3 headers correlates to a particular GPIO pin. The pin it is
connected to is labeled in between the J5, J6 and J7, J8 header groups, this is seen in
. The
columns on either side of the middle column are connected to their coinciding transceiver pins, which are
labeled at the bottom of each column, this is seen in
. For example, looking at header J5, J6 in
, the right column coincides with RX2. Placing a jumper across the first pins of the middle column
and the right column would short GP3 from the LaunchPad to the DIN1 pin on the TRS3122E.
NOTE:
See
for information on headers J1-4 and how they interface with the LaunchPad
ecosystem.
NOTE:
See
and
for more clarification of how the headers are routed.
Figure 7. GPIO Headers
3.5.2
Utilizing FORCEON and FORCEOFF
The J9 3 × 2 header allows for the option to assign FORCEON and FORCEOFF to GP19 and GP18,
respectively. FORCEON can be connected to GP19 by placing a jumper across pins 1 and 2 on J9 and
FORCEOFF can be connected to GP18 by placing a jumper across pins 3 and 4 on J9, see
. This
allows for the control of the different functional modes of the TRS3122E. See
to learn more
about the different functional modes and how to control them using FORCEON and FORCEOFF.
NOTE:
If FORCEON and FORCEOFF are not intended to be controlled, then remove the jumpers
discussed.
