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 i
Button® packages, select the DS9092K iButton Starter Kit
instead of using the options detailed in the tutorial.
- 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
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
||TSOC and TO-92
||TDFN and TO-92
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
||1-Wire Communication Voltage (V)
||Programming Voltage (V)
||Supported 1-Wire Products
||3.3V and EPROM 1-Wire devices
||3.3V devices and DS28E10
||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