EVB-USB5734 Datasheet, PDF (24/37 Pages) Microchip Technology – EVB-USB5734 Evaluation Board User’s Guide

Once inserted onto the EVB-USB5734, the “3V3” Power LED should turn on green.
An SMBus header J15 is provided for accessing the SMDAT and SMCLK signals of
the USB5734 while in UART Mode. There is a DTE serial connector on board (J18)
which connects to a MAX3243 IC for RS232 communication. A 2x2 UART header J17
is provided so that the user can have the capability of using a straight cable or a simple
null-modem cable. The default setup is to jumper pins 1-2 and 3-4 for a straight cable
configuration. If a simple null-modem cable is used, then pins 1-3 and 2-4 should be
shunted together on the J17 header. The “TXD” and “RXD” LEDs on this daughter
card will turn on green to indicate activity on these signals.
There are two supported UART operations when using this IO card. The default oper-
ation is for normal flow control in which the user communicates through the DTE con-
nector with the MAX3243transceiver in circuit. In this configuration, the Xvr Disable
header J31 header should be left open. The second option available is to have no flow
control with the MAX3242 transceiver removed from the circuit. In this configuration,
the Xvr Disable header J31 should have a jumper across pins 1-2 in order to disable
the MAX3242. The UART signals can then be accessed via the UART header J28 on
the EVB-USB5734. Also for this operation, there must be a jumper placed across pins
2 and 3 of the J5 header on the EVB-USB5734 and the J27 header must be left open.
Note: Use of this IO daughter card prevents the use of the on-board SPI and
SMBus Slave.
FIGURE 3-6:
IO MODE 6 DAUGHTER CARD
 2015 Microchip Technology Inc.
DS50002350B-page 24