Evaluates: USB2GPIOISO

USB2GPIOISO# Adapter Board

General Description

The USB2GPIOISO# adapter board, shown in Figure 1,

is designed to work with Maxim’s USB2GPIO# adapter

board to provide galvanic isolation between the ‘master’

USB adapter board and a ‘slave’ EV kit or Pmod™ board.

Four MAX14483 6-channel digital isolators are used to

USB2GPIOISO# block diagram is shown in Figure 2. The

two power domains are on the ‘master’ side (VDD_M and

GNDM), and the ‘slave’ side (VDD_S and GNDS). The two

independent power supplies are provided from the master

board and the slave board with each VDD_ between

1.71V and 5.5V. The two connectors on the ‘master’ side

are male connectors and plug into the female connectors

on the USB2GPIO# adapter, as shown in Figure 3.

USB2GPIOISO# is also designed to work with legacy

USB2PMB1# and USM2PMB2# adapters; connectors

XMA and XSA are 12-pin connectors which support either

SPI with 4 GPIO pins and are fully compatible with

previous adapters and low-pin count EV kit or Pmod

boards. These connectors are controlled from the Munich

GUI or relevant EV kit GUIs. Note that the isolator ICs

have unidirectional channels (in or out). Full bidirectional

The other connectors, XMB and XSB, are 20-pin connectors

supporting extra GPIO connections. These 20-pin

connectors are NOT controlled by the Munich GUI but are

for use with future EV kits and will be controlled by the

relevant EV kit GUIs.

USB2GPIOISO# adapter board can be used to enable

isolated USB-to-SPI/GPIO interface for any Pmod-

compatible plug-in peripheral modules such as the Maxim

MAX14001PMB, and MAXREFDES12-Corona reference

design.

Features

Galvanic Isolation

● Low Propagation Delay 10ns, Typical

● Flexible System Design with Wide 1.71V to 5.5V

Voltage Range on Each Side

● Small PCB area

● Pmod-Compatible Form Factor

319-100179; Rev 0; 4/18

Ordering Information appears at end of data sheet.

Pmod™ is a trademark of Digilent, Inc.

Figure 1. USB2GPIOISO# Board