ds1963s Reliability Data10/10/2022
Features and Benefits
- 4096 bits of read/write nonvolatile (NV) memory organized as 16 pages of 256 bits each
- Eight memory pages with individual 64-bit secrets and 32-bit read-only nonrolling-over page write-cycle counters
- Secrets are write-only and have their own individual write-cycle counters
- On-chip 512-bit SHA-1 (FIPS 180-1, ISO/IEC 10118-3) engine to compute a 160-bit Message Authentication Codes (MAC) and generate page secrets
- Device can operate as a roaming iButton device or as coprocessor for a host computer
- 256-bit scratchpad ensures integrity of data transfer
- On-chip 16-bit CRC generator for safeguarding data transfers
- Overdrive mode boosts communication speed to 125kbps
- Operating temperature range from -40°C to +85°C
- Over 10 years of data retention
- Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike
- Multidrop controller for MicroLAN
- Digital identification and information by momentary contact
- Chip-based data carrier compactly stores information
- Data can be accessed while affixed to object
- Economically communicates to host with a single digital signal at 15.4kbps
- Standard 16mm diameter and 1-Wire protocol ensure compatibility with iButton family of devices
The iButton® monetary device (DS1963S) with SHA-1 Function is a rugged 4kbit read/write data carrier that can be easily accessed with minimal hardware. Its NV memory acts as a localized database for public as well as protected data belonging to the owner of the device and the environment in which it is used. An integrated 512-bit SHA-1 engine can be activated to compute 160-bit message authentication codes (MAC) based on information stored in the device. Data is transferred serially via the 1-Wire® protocol, which requires only a single data lead and a ground return. Using the TMEX™ file format (see Application Note 114) a single DS1963S can serve up to four independent applications, such as secure change purses for electronic payment at local transit systems, pay phones, parking systems or vending machines. The DS1963S is also intended to function as a coprocessor that assists the host in computing signatures, using a secure signing secret, when writing back the new balance to a roaming device after a purchase.
The DS1963S, like other SRAM-based iButton devices, has an additional memory area called the scratchpad that acts as a buffer when writing to the main memory. The DS1963's scratchpad is also used for feeding data segments to the SHA-1 engine or receiving/comparing message authentication codes.
Data is first written to the scratchpad from where it can be read back. After the data has been verified, a copy scratchpad command will transfer the data to main memory. This process ensures data integrity in an environment that does not provide a reliable electric contact.
Each DS1963S has its own 64-bit ROM registration number that is factory lasered into the chip inside to provide a guaranteed unique identity for absolute traceability. The durable MicroCan package is highly resistant to environmental hazards such as dirt, moisture, and shock. Its compact coin-shaped profile is self-aligning with mating receptacles, allowing the DS1963S to be easily used by human operators. Accessories permit the DS1963S to be mounted on almost any surface including plastic key fobs, photo-ID badges and printed circuit boards.
- For Electronic Payment at Local Transit Systems, Pay Phones, Parking Systems, or Vending Machines
- Photo ID Badges
- Printed circuit boards
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
The eCash Evaluation Kit demonstrates the speed, reliability, and security of a SHA-1 based iButton® eCash system. The provided eCash debit board is a complete stand-alone module that will perform monetary debits in a fast 100ms. The eCash debit board has a serial interface that allows a PC or microprocessor to monitor or provide manual control of the debit process. Utilizing the serial interface, this demo could easily be integrated into a real eCash or access control system.
Web-Based Kit Description and Instructions are also available.
Features & Benefits
- Stand-alone eCash evaluation circuit board with LCD display and Audible feedback.
- Supports both DS1963S and DS1961S iButton SHA-1 devices as debit tokens.
- Once initialized, the DS1963S coprocessor on the debit board keeps the money secret secure
- Secure eCash debits in 100ms (approximate).
- 2 Java™ programs (compatible with Windows® and Linux) provided for download to initialize eCash coprocessors and tokens as well as to monitor evaluation board.
- Evaluation board can be used as a component in a larger control system (Service Control Unit).
- Complete firmware source provided in portable 'C' code.
- Schematic design and list of components of eval board provided.
- Evaluation board can be used for eCash code development with the onboard single-cycle 8051 compatible DS89C420.
Documentation & Resources
iButton Data Loggers5/17/2019
White Paper 2: Using the 1-Wire® Public Domain Kit7/16/2008
1-Wire Software Resource Guide Device Description7/8/2008
DS2460 in a SHA-1 Secure System1/7/2008
Software Methods to Achieve Robust 1-Wire® Communication in iButton® Applications9/11/2007
Selecting a Serial Bus1/30/2007
What Is an iButton Device?5/17/2006
White Paper 9: Are SHA-1 Devices Still Secure Enough?5/19/2005
White Paper 1: SHA Devices Used in Small Cash Systems12/20/2002
White Paper 8: 1-Wire® SHA-1 Overview9/10/2002
White Paper 5: Using 1-Wire APIs for Data Sheet Commands6/7/2002
1-Wire Communication Through Software5/30/2002
SHA iButton API Overview3/27/2002
Challenge and Response with 1-Wire® SHA Devices3/12/2002
Using the DS2480B Serial 1-Wire® Line Driver3/12/2002
Dallas Buttons Ease Software Distribution Management3/8/2002
Maxim Digital Monetary Certificates3/8/2002
Passwords in SHA Authentication2/22/2002
Small Message Encryption using SHA Devices2/4/2002
Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products3/29/2001
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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