DS1963S datasheet, PDF - EEWORLD Datasheet

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DS1963S: DescriptionSPECIALTY MEMORY CIRCUIT, MEDB2; Categorystorage storage; File Size345KB，37 Pages; ManufacturerDALLAS; Websitehttp://www.dalsemi.com

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DS1963S Overview

SPECIALTY MEMORY CIRCUIT, MEDB2

DS1963S Parametric

Parameter Name	Attribute value
Maker	DALLAS
package instruction	MICROCAN-2
Reach Compliance Code	unknow
JESD-30 code	O-MEDB-N2
memory density	4096 bi
Memory IC Type	MEMORY CIRCUIT
memory width	8
Number of functions	1
Number of terminals	2
word count	512 words
character code	512
Operating mode	ASYNCHRONOUS
Maximum operating temperature	70 °C
Minimum operating temperature	-40 °C
organize	512X8
Package body material	METAL
Encapsulate equivalent code	BUTTON,.68IN
Package shape	ROUND
Package form	DISK BUTTON
power supply	3/5 V
Certification status	Not Qualified
Maximum supply voltage (Vsup)	6 V
Minimum supply voltage (Vsup)	2.8 V
Nominal supply voltage (Vsup)	5 V
surface mount	YES
technology	CMOS
Temperature level	OTHER
Terminal form	NO LEAD
Terminal location	END

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DS1963S

SHA iButton

www.iButton.com

SPECIAL FEATURES

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 non rolling-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 roaming iButton

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 125 kbits per second

Operating temperature range from -20°C to

+85°C

Over 10 years of data retention

Button shape is self-aligning with cup-

shaped probes

Durable stainless steel case engraved with

registration number withstands harsh

environments

Easily affixed with self-stick adhesive

backing, latched by its flange, or locked with

a ring pressed onto its rim

Presence detector acknowledges when reader

first applies voltage

Meets UL#913 (4th Edit.); Intrinsically Safe

Apparatus, Approved under Entity Concept

for use in Class I, Division 1, Group A, B, C

and D Locations (application pending)

F5 MicroCan

5.89

0.51

16.25

000000FBC52B

1-Wire

17.35

COMMON iButton FEATURES

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 15.4 kbits per second

Standard 16 mm diameter and 1-Wire

protocol ensure compatibility with iButton

Device family

GND

All dimensions are shown in millimeters

ORDERING INFORMATION

DS1963S

F5 MicroCan

EXAMPLES OF ACCESSORIES

DS9096P

DS9101

DS9093RA

DS9093A

DS9092

Self-Stick Adhesive Pad

Multipurpose Clip

Mounting Lock Ring

Snap-In Fob

iButton Probe

iButton and 1-Wire are registered trademarks of Dallas Semiconductor.

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021704

DS1963S

iButton DESCRIPTION

The DS1963S Monetary iButton with SHA-1 Function is a rugged 4 kbit 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 iButtons, 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.

SECURITY

A system that uses mobile data carriers consists mainly of three components, 1) host computers that read

and write data carriers, 2) the data carriers (“slave devices”) themselves, and 3) the users of the system

who might be tempted to manipulate the data or to emulate the behavior of the data carrier. The DS1963S

is designed to address all these areas of attacks without using any proprietary restricted algorithms. The

security of the device is based on the Secure Hash Standard SHA-1, which is documented on the Internet

at locations such as http://www.itl.nist.gov/div897/pubs/fip180-1.htm.

The table below shows a matrix of possible non-violent attacks in form of a truth table. The notes

referenced in the table explain the typical methods to defeat the attacks. A more detailed description is

found in the section “Application Overview” near the end of this document. For the full description of the

functions used see section “Memory and SHA Function Commands” and the SHA-1 Computation and

message formats.

Authorized

Host

Unauthorized

Host

Authentic data

See note 2

Normal operation

See note 1

Don’t care

Manipulated data

See notes 2 and 3

See note 3

Don’t care

Emulated slave

Authentic

Slave

Emulated slave

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DS1963S

Note 1: The device provides functions to authenticate the host based on a system-wide secret, the

device’s ROM Registration number and a user-selected pin number that is installed in one of the

memory pages of a roaming data carrier.

Note 2: To find out whether a slave device is authentic the host writes a 3-byte “challenge” to the

scratchpad before issuing a command to compute the SHA-1 MAC over the challenge, the data

of a memory page, the page number, the page’s write-cycle counter, the device’s ROM

Registration number, and the secret associated with that page. By varying the challenge every

time it reads from a slave, the host can verify that the slave contains the correct secret and can

perform the required SHA computation in the required time.

Note 3: Manipulated data can be discovered if the data in the slave device is “signed” by an authorized

host. Signing consists of calculating a 160-bit SHA-1 MAC over the data to be protected, the

write-cycle counter of the page on which it is to be stored, the ROM ID of the slave device in

which it is to be stored, and any dedicated secret known only to authorized hosts. The MAC is

stored together with the application data (a monetary value together with a transaction ID code,

for example) in an appropriate memory page. To verify the authenticity of the data the host

repeats the process of signing. Any change in the data, the cycle counter, data carrier or an

invalid (not belonging to the system) signing-secret will make the verification of the signature

fail.

OVERVIEW

The block diagram in Figure 1 shows the relationships between the major control and memory sections of

the DS1963S. The DS1963S has six main data components: 1) 64-bit lasered ROM, 2) 256-bit scratch-

pad, 3) eight 32-byte pages of general-purpose SRAM, 4) eight 32-byte pages of SRAM protected by

write-cycle counters, 5) two 32-byte pages storing eight 64-bit secrets with individual write-cycle

counters, and 6) a 512-bit SHA-1 Engine (SHA = Secure Hash Algorithm). The hierarchical structure of

the 1-Wire protocol is shown in Figure 2. All write-cycle counters are 32 bits long and will not roll over

once the maximum count has been reached. The contents of the counters is read together with the

memory data using a special command. The bus master must first provide one of the seven ROM

Function Commands, 1) Read ROM, 2) Match ROM, 3) Search ROM, 4) Skip ROM, 5) Resume

Communication, 6) Overdrive-Skip ROM or 7) Overdrive-Match ROM. Upon completion of an

Overdrive ROM command byte executed at standard speed, the device will enter Overdrive mode where

all subsequent communication occurs at a higher speed. The protocol required for these ROM function

commands is described in Figure 10. After a ROM function command is successfully executed, the

memory functions become accessible and the master may provide any one of the eight memory function

commands. The protocol for these memory function commands is described in Figure 7. All data is read

and written least significant bit first.

PARASITE POWER

The block diagram (Figure 1) shows the parasite-powered circuitry. This circuitry “steals” energy

whenever the data contact is in the logic-high state. This stolen energy will provide sufficient power

while the data contact is in a logic-low state as long as the specified timing and voltage requirements are

met. The advantages of parasite power are two-fold: 1) by stealing energy off this input, the DS1963S-

internal lithium reserves are conserved and 2) if the lithium is exhausted for any reason, the ROM may

still be read normally. The remaining circuitry of the DS1963S is solely operated by lithium energy.

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