APPLICATION NOTE 3-lead CONTACT Package Usage ATSHA204A, ATECC108A, and ATECC508A Introduction ® The Atmel CryptoAuthentication™ devices are often used in product accessory or product ecosystem management. These include battery authentication or similar applications where electrical contact with the authentication device is made using mechanical pressure against compression connectors, i.e. unsoldered connections. This application note provides general usage guidelines for the 3-lead CONTACT package option that is available with the Atmel symmetric and asymmetric authentication products: ATSHA204A, ATECC108A, and ATECC508A. 3-lead CONTACT Package Intended for Use With Removable Accessories, Modules, or Components Electrical Contact Between IC and Host System is Accomplished With Mechanical Pressure Contacts to Allow for Accessory Removal Use With Common Compression Connectors Figure 1. CONTACT Package Pinout Atmel-8977A-CryptoAuth-3-lead-CONTACT-Usage-ApplicationNote_082014 1 Package Substrate Support The 3-lead CONTACT package is intended to be permanently attached to a base substrate (circuit board, frame, system enclosure, etc.) to provide mechanical support for the IC as pressure is applied to make the electrical contact. The embossed/recessed IC receptacle shown in the below figure is an example and is not a required configuration, but illustrates the need for proper mechanical support for the IC to ensure reliable long-term operation under repeated pressure connection cycles. Figure 1-1. 2 Embossed/Recessed IC Receptacle Example Attachment of Package to Substrate Attachment of the IC to the substrate itself can be accomplished with most standard epoxies or adhesives depending on the mechanical and environmental requirements of the system in which it is used. The adhesive should be applied in a pattern that will spread evenly along the package surface and will not leave large voids. An approximate example is shown below: Figure 2-1. 2 Adhesive Attachment 3-lead CONTACT Package Usage [APPLICATION NOTE] 2 Atmel-8977A-CryptoAuth-3-lead-CONTACT-Usage-ApplicationNote_082014 The amount of adhesive deposited depends upon the properties of the adhesive used, and the relevant application notes of the adhesive supplier should be referenced. To provide even coverage of the rear surface of 3 the package to a uniform depth of 0.2mm will require the application of ~3mm of adhesive. Proper deposition of adhesive should produce even distribution beneath the package with no voids as illustrated below: Figure 2-2. CORRECT – Even Adhesive Coverage Compression Connector 3-lead CONTACT Device Adhesive If the deposition profile/pattern does not produce an even spread of adhesive, voids in the adhesive can result in stress on the package when under pressure with the compression connector. The below figure illustrates an example: Figure 2-3. INCORRECT – Uneven Adhesive Coverage Causing Voids Compression Connector 3-lead CONTACT Device Adhesive 3 Compression Connectors The 3-lead CONTACT package is intended to be used with 2mm pitch compression connectors. The connectors listed below or those with similar dimensions and mechanical characteristics can be used with this package: Molex 47615-020 Molex 105040-001 Molex 47275-001 3-lead CONTACT Package Usage [APPLICATION NOTE] Atmel-8977A-CryptoAuth-3-lead-CONTACT-Usage-ApplicationNote_082014 3 3 Appendix A Package Drawing A.1 3RB — 3-lead CONTACT C B f 0.10 C A Pin 1 Pin 1 0.30 REF b E 0.30 REF e (3x) L (3x) f A A1 D g d 0.08 C COMMON DIMENSIONS (Unit of Measure = mm) SYMBO L MIN NOM MAX D 2.40 2.50 2.60 E 6.40 6.50 6.60 A 0.45 0.50 0.55 A1 0.0 - 0.05 e 1.60 1.70 1.80 b NOTE 2.00 BSC L 2.10 2.20 2.30 f 0.30 0.40 0.50 g 0.05 0.15 0.25 12/16/11 TITLE Package Drawing Contact: [email protected] 4 3RB, 3-lead 2.5x6.5mm Body, 2.0 mm pitch, CONTACT PACKAGE. (Sawn) 3-lead CONTACT Package Usage [APPLICATION NOTE] 4 Atmel-8977A-CryptoAuth-3-lead-CONTACT-Usage-ApplicationNote_082014 GPC RHB DRAWING NO. 3RB REV. A Appendix B The following are drawings for connectors listed in Section 3. B.1 Molex 47615-020 3-lead CONTACT Package Usage [APPLICATION NOTE] Atmel-8977A-CryptoAuth-3-lead-CONTACT-Usage-ApplicationNote_082014 5 5 B.2 Molex 105040-001 6 3-lead CONTACT Package Usage [APPLICATION NOTE] 6 Atmel-8977A-CryptoAuth-3-lead-CONTACT-Usage-ApplicationNote_082014 B.3 Molex 47275-001 3-lead CONTACT Package Usage [APPLICATION NOTE] Atmel-8977A-CryptoAuth-3-lead-CONTACT-Usage-ApplicationNote_082014 7 7 Appendix C Revision History Doc Rev. Date 8977A 08/2015 Atmel Corporation Comments Initial document release. 1600 Technology Drive, San Jose, CA 95110 USA T: (+1)(408) 441.0311 F: (+1)(408) 436.4200 │ www.atmel.com © 2015 Atmel Corporation. / Rev.:Atmel-8977A-CryptoAuth-3-lead-CONTACT-Usage-ApplicationNote_082014. Atmel®, Atmel logo and combinations thereof, Enabling Unlimited Possibilities®, and others are registered trademarks or trademarks of Atmel Corporation in U.S. and other countries. Other terms and product names may be trademarks of others. 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