EVB-USB5734 datasheet(16/37 Pages) MICROCHIP

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EVB-USB5734 Evaluation Board User’s Guide

DS50002350B-page 16

 2015 Microchip Technology Inc.

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)

PU/PD STATUS

SMBUS Slave

short pins 1-2

GPIO4 = PU

GPIO5 = PU

I2C Bridging

open

GPIO4 = open

GPIO5 = open

UART

open

short pins 2-3

GPIO4 = open

GPIO5 = PD

EVB-USB5734 Datasheet(PDF) 16 Page - Microchip Technology