DS1985U Maxim, DS1985U Datasheet

DS1985U

Manufacturer Part Number

DS1985U

Description

UniqueWare iButtons are factory-programmed versions of the DS1982 (1024 bit) and the DS1985 (16Kb) Add-Only iButtons, respectively

Manufacturer

Maxim

Datasheet

1.DS1982U.pdf (4 pages)

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SPECIAL FEATURES

 1024 bits or 16Kb Electrically Programmable

 Unique, factory lasered and tested 64-bit

 EPROM partitioned into 256-bit pages for

 Each memory page can be permanently

 Device is an “add only” memory where

 Reduces control, address, data, power and

 8-bit family code specifies device

 Presence detector acknowledges when reader

 Reads over a wide voltage range of 2.8V to

DESCRIPTION

UniqueWare iButtons are factory-programmed versions of the DS1982 (1024 bit) and the DS1985 (16Kb)

Add-Only iButtons, respectively. They differ from the regular devices in their custom ROM family codes

(see the Ordering Information) and the UniqueWare Identifier 5E7h in place of the upper 12 bits of the

standard serialization field. For technical details on the devices, refer to the DS1982 and DS1985 data

sheets.

UniqueWare Add-Only iButtons are only available preprogrammed with customer-specific and write-

protected data. UniqueWare data fills at least one but no more than the first two pages of a device,

depending on the length of the customer-supplied data.

UniqueWare devices are only available to existing customers. New data patterns are no longer accepted.

The minimum order quantity (MOQ) is 34,000 pieces with higher quantities available in multiples of

17,000 pieces. UniqueWare iButtons can only be purchased in bulk form, delivered in bags. The shipment

quantity can be plus or minus 10% of the order quantity. Only the quantity shipped will be billed.

UniqueWare is a trademark of Maxim Integrated Products, Inc.

iButton and 1-Wire are registered trademarks of Maxim Integrated Products, Inc.

Read Only Memory (EPROM)

communicates with the economy of one

signal plus ground

registration number (8-bit family code, 3-bit

serialization, 12-bit UniqueWare Identifier

5E7h, 8-bit CRC tester) assures absolute

traceability because no two parts are alike

randomly accessing packetized data records

write-protected to prevent tampering

additional data can be programmed into

EPROM without disturbing existing data

programming signals to a single pin

communications requirements to reader

first applies voltage

6.0V from -40°C to +85°C

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COMMON iButton FEATURES

 Multidrop controller for 1-Wire network

 Digital identification and information by

 Chip-based data carrier compactly stores

 Data can be accessed while affixed to object

 Economically communicates to bus master

 Standard 16mm diameter and 1-Wire®

 Button shape is self-aligning with cup-

 Durable stainless steel case engraved with

 Easily affixed with self-stick adhesive

 Presence detector acknowledges when reader

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

momentary contact

information

with a single digital signal at 16.3kbps

protocol ensure compatibility with iButton®

family

shaped probes

registration number withstands harsh

environments

backing, latched by its flange, or locked with

a ring pressed onto its rim

first applies voltage

Apparatus, Approved under Entity Concept

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

and D Locations (application pending)

UniqueWare™ iButton®

DS1982U/DS1985U

19-5070; Rev 12/09

Related parts for DS1985U

DS1985U Summary of contents

Page 1

... Only the quantity shipped will be billed. UniqueWare is a trademark of Maxim Integrated Products, Inc. iButton and 1-Wire are registered trademarks of Maxim Integrated Products, Inc. DS1982U/DS1985U UniqueWare™ iButton® COMMON iButton FEATURES  Multidrop controller for 1-Wire network  ...

Page 2

... NODE ADDRESS Figure 2a Company ID Value Extension ID Value LSB MSB 3 bytes constant 5 bytes serialization assigned by IEEE 1-Wire Software Development DS1982U/DS1985U Project ID LSB MSB LSB 4 bytes constant low address Project ID LSB MSB LSB 4 bytes ...

Page 3

... Project ID assigned to each individual data pattern at the time of the first order. +Denotes a lead(Pb)-free/RoHS-compliant package. FAMILY CODE PACKAGE F3 MicroCan 89h F5 MicroCan F3 MicroCan 8Bh F5 MicroCan DS1982U/DS1985U ORDERING PART NUMBER DS1982U-F3-pppp+ DS1982U-F5-pppp+ DS1985U-F3-pppp+ DS1985U-F5-pppp+ ...

Page 4

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