How to Build a 1-Wire® Evaluation Kit

2012-05-14

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摘要

The 1-Wire product family includes numerous devices that can be easily evaluated using a Windows^®-based PC with a USB port and free demo software from Maxim's website. This tutorial describes parts that can be used for the hardware and explains how to download the software.

Introduction

You can easily build a 1-Wire evaluation (EV) kit from off-the-shelf 1-Wire components that are offered in TO-92, TSOC, and TDFN packages. The EV kit includes free demo software that runs on a Windows^®-based PC with a USB port. The kit also includes a socket board into which the 1-Wire device is plugged. The EV kit is useful for performing a first-time evaluation of a 1-Wire device, but is also convenient for low-volume preprogramming applications where specific data patterns are written to a 1-Wire memory device. For iButton^® packages, select the DS9092K iButton Starter Kit instead of using the options detailed in the tutorial.

Components

1-Wire device for evaluation
Socket board and RJ-11 cable
USB adapter
Free 1-Wire demo software

1-Wire Devices Supported

This EV kit design only supports 1-Wire devices available in the TO-92, TSOC, and TDFN packages. To determine which packages are available for a given 1-Wire device, consult the Ordering Information section of an individual device's data sheet. An overview of all available 1-Wire devices can be found here.

Socket Board

The DS9120 family of socket boards is offered for TO-92, TSOC, and TDFN packages. After you have selected the package for your 1-Wire device and verified package availability on the device data sheet, select the corresponding DS9120 variant. Each variant includes an RJ-11 cable to connect to the USB adapter. For more details, consult the DS9120 data sheet. Table 1 summarizes the DS9120 variant parts.

Table 1. DS9120 Variants
Variant	Package
DS9120+	TO-92 only
DS9120P+	TSOC and TO-92
DS9120Q+	TDFN and TO-92

USB Adapter

Maxim offers two USB adapters that can be used for the 1-Wire EV kit. The DS9490R is the lowest cost adapter that will work for 5V EEPROM 1-Wire devices and any others that do not require a special external programming voltage. For 1-Wire devices that operate at 3.3V or use EPROM and other one-time programmable (OTP) technologies, the DS9481R should be selected. Some 1-Wire EPROM devices require an external 12V programming pulse applied in order to program the memory. The DS28E10 is an example of an OTP device that requires a 7V programming voltage. The DS9481R-3C7 is fully equipped to internally generate the 12V and 7V programming voltages. Table 2 summarizes the adapter capabilities.

Table 2. USB Adapters
USB Adapter	1-Wire Communication Voltage (V)	Programming Voltage (V)	Supported 1-Wire Products
DS9481R-3C7	3.3	12	3.3V and EPROM 1-Wire devices
DS9481R-3C7	3.3	7	3.3V devices and DS28E10
DS9490R	5	5	All other 5V 1-Wire devices

Free 1-Wire Demo Software

If you have selected the DS9481R-3C7, you must install the Prolific Software drivers prior to installing the Maxim 1-Wire demo software. In this case, follow the installation instructions detailed in the Quick Start section of the DS9481R data sheet. If you have selected the DS9490R adapter, follow the instructions below:

Go to the 1-Wire Drivers—Getting Started webpage.
Click the Click to go to Download Page button.
From the Choose Operating System drop-down list, select your OS.
From the Select File drop-down list, select 32-bit or 64-bit 1-Wire drivers for the architecture being used by your OS.
Click the Download button.
When prompted by the question Do you want to run or save this file?, select Run.
When you get a security warning that says Do you want to run the software?, select Run.
Read and check the box if you accept the license agreement and click Install.
Click Finish to exit the Setup Wizard.

For a tutorial on how to use the OneWireViewer demo software, consult the OneWireViewer User's Guide. For troubleshooting, see application note 5057, "OneWireViewer Tips and Tricks."