DS1982-F3 데이터 시트보기 (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS1982-F3

1-kbit Add-Only iButton™

Dallas Semiconductor -> Maxim Integrated 

ORDERING INFORMATION

DS1982-F3

F3 MicroCan

DS1982-F5

F5 MicroCan

DS1982

EXAMPLES OF ACCESSORIES

DS9096P

Self-Stick Adhesive Pad

DS9101

Multi-Purpose Clip

DS9093RA

Mounting Lock Ring

DS9093F

Snap-In Fob

DS9092

iButton Probe

iButton DESCRIPTION

The DS1982 1-kbit Add-Only iButton is a rugged read/write data carrier that identifies and stores relevant

information about the product or person to which it is attached. This information can be accessed with

minimal hardware, for example, a single port pin of a microcontroller. The DS1982 consists of a factory-

lasered registration number that includes an unique 48-bit serial number, an 8–bit CRC, and an 8-bit

Family Code (09h) plus 1 kbit of EPROM which is user-programmable. The power to program and read

the DS1982 is derived entirely from the 1-Wire communication line. Data is transferred serially via the 1-

Wire protocol which requires only a single data lead and a ground return. The entire device can be

programmed and then write-protected if desired. Alternatively, the part may be programmed multiple

times with new data being appended to, but not overwriting, existing data with each subsequent

programming of the device. Note: Individual bits can be changed only from a logical 1 to a logical 0,

never from a logical 0 to a logical 1. A provision is also included for indicating that a certain page or

pages of data are no longer valid and have been replaced with new or updated data that is now residing at

an alternate page address. This page address redirection allows software to patch data and enhance the

flexibility of the device as a standalone database. The 48-bit serial number that is factory-lasered into

each DS1982 provides a guaranteed unique identity which allows for absolute traceability. The durable

MicroCan package is highly resistant to harsh environments such as dirt, moisture, and shock. Its compact

button-shaped profile is self-aligning with cup-shaped receptacles, allowing the DS1982 to be used easily

by human operators or automatic equipment. Accessories permit the DS1982 to be mounted on printed

circuit boards, plastic key fobs, photo-ID badges, ID bracelets, and many other objects. Applications

include work-in-progress tracking, electronic travelers, access control, storage of calibration constants,

and debit tokens.

OVERVIEW

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

the DS1982. The DS1982 has three main data components: 1) 64-bit lasered ROM, 2) 1024-bit EPROM,

and 3) EPROM Status Bytes. The device derives its power for read operations entirely from the 1-Wire

communication line by storing energy on an internal capacitor during periods of time when the signal line

is high and continues to operate off of this “parasite” power source during the low times of the 1-Wire

line until it returns high to replenish the parasite (capacitor) supply. During programming, 1-Wire

communication occurs at normal voltage levels and then is pulsed momentarily to the programming

voltage to cause the selected EPROM bits to be programmed. The 1-Wire line must be able to provide 12

volts and 10 milliamperes to adequately program the EPROM portions of the part. Whenever

programming voltages are present on the 1-Wire line a special high voltage detect circuit within the

DS1982 generates an internal logic signal to indicate this condition. The hierarchical structure of the 1-

Wire protocol is shown in Figure 2. The bus master must first provide one of the four ROM function

commands: 1) Read ROM, 2) Match ROM, 3) Search ROM, 4) Skip ROM. These commands operate on

the 64-bit lasered ROM portion of each device and can singulate a specific device if many are present on

the 1-Wire line as well as indicate to the bus master how many and what types of devices are present. The

protocol required for these ROM function commands is described in Figure 9. After a ROM function

command is successfully executed, the memory functions that operate on the EPROM portions of the

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