EVB-USB5734 Datasheet, PDF (16/37 Pages) Microchip Technology – EVB-USB5734 Evaluation Board User’s Guide

EVB-USB5734 Evaluation Board User’s Guide
FIGURE 2-5:
SMBUS SELECT
2.4.3 UART
The USB5734 provides a USB to UART bridge function that can be used in a simple
two wire TX/RX mode or in a full modem signaling configuration (see Mode 6 section
in Chapter 3). For simple two wire mode the J27 header must be left open and the J5
header must have a jumper installed across pins 2 and 3. This jumper is required in
order to add a pull-down resistor on the UART_TX signal in order to enable the UART
interface. Once in UART mode, the J28 UART header should be used for accessing
the UART_RX and UART_TX signals on the USB5734. Note that UART can be
enabled in configured IO Modes 1, 2, 3, 4, and 5. When IO Mode 6 is installed into the
J7 IO connector (described more in section below), the J5 header does not require a
jumper in order to configure the USB5734 for UART mode. The following table details
the GPIO4/GPIO5 jumper options available to configure the USB5734 into different
modes.
TABLE 2-1: SMBUS / UART SELECT
MODE
GPIO4 (J27)
GPIO5 (J5)
SMBUS Slave short pins 1-2 short pins 1-2
I2C Bridging
open
open
UART
open
short pins 2-3
PU/PD STATUS
GPIO4 = PU
GPIO5 = PU
GPIO4 = open
GPIO5 = open
GPIO4 = open
GPIO5 = PD
DS50002350B-page 16
 2015 Microchip Technology Inc.