This application note goes over the basics of using 1-Wire devices to create electro-mechanical contact solutions. It then provides example use cases and an example assembled module.
Adding electronic functionality to traditional nonelectronic peripherals and consumables is a common application requirement. This is typically driven by system requirements, including storage of calibration data, manufacturing information, or original equipment manufacturer (OEM) authentication of the peripheral, accessory, or consumable. In addition to selecting the proper IC feature set to provide security and memory for these applications, a reliable and cost-effective solution is needed to attach the IC to the peripheral and make an electro-mechanical connection between the peripheral and host system.
For standard flat surfaces Maxim offers a patented 1-Wire® Contact Package solution, also referred to as an SFN package. Maxim currently offers three different size options for this package, providing a cost-effective method for attachment of a 1-Wire IC to the nonelectronic peripheral combined with a reliable electro-mechanical contact surface.
Figure 1. 1-Wire SFN contact package dimensions (mm), bottom view.
Beyond the SFN Package
For applications that require attachment to flexible surfaces, contoured surfaces, or simply larger connecting contacts, Maxim's 1-Wire ICs can be utilized in an IC plus flexible printed circuit board (PCB) module solution. The reduced pin count of the 1-Wire interface simplifies the number of contacts of a module solution to just two contact pads for IO and GND. With the addition of an adhesive back, these flexible modules can then be easily applied to most surfaces.
Figure 2. Example flexible module.
Figure 3. Example circuit.
Figure 4. Example applications using the flexible module.
Choosing a Flex PCB Supplier
Customers who need assistance in finding a PCB supplier for these type of module builds can contact Maxim and request for more information through the following link:
Table 1. Typical 1-Wire Devices for Use with Electro-Mechanical Contact Packaging
|DS28E16||1-Wire||256 bits||SHA3-256 authentication|
|DS24B33||1-Wire||4Kb||Secure serial number|
|DS2431||1-Wire||1Kb||Secure serial number|
|DS28E05||1-Wire||896 bits||Secure serial number|
- Application note 4132, "Attachment Methods for the Electro-Mechanical 1-Wire Contact Package"
- 1-Wire is a registered trademark of Maxim Integrated Products, Inc.