Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsIntegrated Circuits (ICs)4 kBit 256 x 16

1 of 17

SPECIAL FEATURES

 4096 bits of Read/Write Nonvolatile

Memory (DS1993)

 1024 bits of Read/Write Nonvolatile

Memory (DS1992)

 256-bit Scratchpad Ensures Integrity of Data

Transfer

 Memory Partitioned into 256-bit Pages for

Packetizing Data

 Data Integrity Assured with Strict

Read/Write Protocols

 Operating Temperature Range from -40°C to

+70°C

 Over 10 years of data retention

ORDERING INFORMATION

DS1992L-F5+ F5 MicroCan

DS1993L-F5+ F5 MicroCan

+Denotes a lead(Pb)-free/RoHS-compliant product.

EXAMPLES OF ACCESSORIES

DS9096P Self-Stick Adhesive Pad

DS9101 Multipurpose Clip

DS9093RA Mounting Lock Ring

DS9093F Snap-In Fob

DS9092 i

Button Probe

F5 MicroCan

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 Bus Master

with a Single Digital Signal at 16.3kbps

 Standard 16mm Diameter and 1-Wire

Protocol Ensure Compatibility with iButton

Family

 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, 5th Ed., Rev. 1997-02-24;

Intrinsically Safe Apparatus, Approved under

Entity Concept for use in Class I, Division 1,

Group A, B, C, and D Locations

DS1992/DS1993

1Kb/4Kb Memory iButton

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

19-4865; Rev 4/11

Summary of content (17 pages)

PAGE 1
9-4865; Rev 4/11 DS1992/DS1993 1Kb/4Kb Memory iButton SPECIAL FEATURES COMMON iButton FEATURES         4096 bits of Read/Write Nonvolatile Memory (DS1993) 1024 bits of Read/Write Nonvolatile Memory (DS1992) 256-bit Scratchpad Ensures Integrity of Data Transfer Memory Partitioned into 256-bit Pages for Packetizing Data Data Integrity Assured with Strict Read/Write Protocols Operating Temperature Range from -40°C to +70°C Over 10 years of data retention      ORDERING INFORMATION DS1992L-
PAGE 2
DS1992/DS1993 iButton DESCRIPTION The DS1992/DS1993 memory iButtons (hereafter referred to as DS199x) are rugged read/write data carriers that act as a localized database, easily accessible with minimal hardware. The nonvolatile memory and optional timekeeping capability offer a simple solution to storing and retrieving vital information pertaining to the object to which the iButton is attached.
PAGE 3
DS1992/DS1993 Figure 1. DS1992/DS1993 BLOCK DIAGRAM 1-WIRE PORT ROM FUNCTION CONTROL 1-W PARASITEPOWERED CIRCUITRY 64-BIT LASERED ROM MEMORY FUNCTION CONTROL 256-BIT SCRATCHPAD SRAM 16 PAGES of 256BITs (1993) 4 PAGES of 256BITs (1992) 3V LITHIUM Figure 2. 64-BIT LASERED ROM MSB LSB 8-Bit CRC Code MSB 8-Bit Family Code (06h)1993 (08h)1992 48-Bit Serial Number LSB MSB LSB MSB LSB Figure 3.
PAGE 4
DS1992/DS1993 Figure 4a. DS1993 MEMORY MAP SCRATCHPAD MEMORY NOTE: Each page is 32 bytes (256 bits). The hex values represent the starting address for each page or register. PAGE PAGE 0 0000h PAGE 1 0020h PAGE 2 0040h PAGE 3 0060h PAGE 4 0080h PAGE 5 00A0h PAGE 6 00C0h PAGE 7 00E0h PAGE 8 0100h PAGE 9 0120h PAGE 10 0140h PAGE 11 0160h PAGE 12 0180h PAGE 13 01A0h PAGE 14 01C0h PAGE 15 01E0h Figure 4b. DS1992 MEMORY MAP SCRATCHPAD NOTE: Each page is 32 bytes (256 bits).
PAGE 5
DS1992/DS1993 MEMORY The memory map in Figure 4 shows a 32-Byte page called the scratchpad, and additional 32-Byte pages called memory. The DS1992 contains pages 0 though 3 that make up the 1024-bit SRAM. The DS1993 contain pages 0 through 15 that make up the 4096-bit SRAM. The scratchpad is an additional page that acts as a buffer when writing to memory. Data is first written to the scratchpad where it can be read back.
PAGE 6
DS1992/DS1993 Copy Scratchpad [55h] This command is used to copy data from the scratchpad to memory. After issuing the copy scratchpad command, the user must provide a 3-byte authorization pattern. This pattern must exactly match the data contained in the three address registers (TA1, TA2, E/S, in that order). If the pattern matches, the AA (Authorization Accepted) flag is set and the copy begins. A logic 0 is transmitted after the data has been copied until the user issues a reset pulse.
PAGE 7
DS1992/DS1993 Figure 6.
PAGE 8
DS1992/DS1993 Figure 6.
PAGE 9
DS1992/DS1993 MEMORY FUNCTION EXAMPLES Example: Write two data Bytes to memory locations 0026h and 0027h (the seventh and eighth Bytes of page 1). Read entire memory.
PAGE 10
DS1992/DS1993 1-Wire BUS SYSTEM The 1-Wire bus is a system that has a single bus master and one or more slaves. In all instances the DS199x is a slave device. The bus master is typically a microcontroller or PC. For small configurations the 1-Wire communication signals can be generated under software control using a single port pin. For multisensor networks, the DS2480B 1-Wire line driver chip or serial port adapters based on this chip (DS9097U series) are recommended.
PAGE 11
DS1992/DS1993 slave(s). The presence pulse lets the bus master know that the DS199x is on the bus and is ready to operate. For more details, see the 1-Wire Signaling section. ROM FUNCTION COMMANDS Once the bus master has detected a presence, it can issue one of the four ROM function commands. All ROM function commands are 8 bits long. A list of these commands follows (see the flow chart in Figure 9).
PAGE 12
DS1992/DS1993 Figure 9.
PAGE 13
DS1992/DS1993 Figure 10.
PAGE 14
DS1992/DS1993 Figure 11.
PAGE 15
DS1992/DS1993 PHYSICAL SPECIFICATIONS Size Weight Expected Service Life Safety See mechanical drawing 3.3 grams (F5 package) 10 years at +25°C Meets UL 913, 5th Ed., Rev. 1997-02-24; Intrinsically Safe Apparatus, Approved under Entity Concept for use in Class I, Division 1, Group A, B, C, and D Locations ABSOLUTE MAXIMUM RATINGS Voltage Range on any Pin Relative to Ground Operating Temperature Range Storage Temperature Range -0.5V to +7.
PAGE 16
DS1992/DS1993 Note 1: All voltages are referenced to ground. Note 2: VIH is a function of the external pullup resistor and the VCC power supply. Note 3: VPUP = external pullup voltage. Note 4: Input load is to ground. Note 5: Capacitance on the data line could be 800pF when power is first applied. If a 5kΩ resistor is used to pull up the data line to VPUP, 5µs after power has been applied, the parasite capacitance does not affect normal communications. Note 6: Guaranteed by design; not production tested.
PAGE 17
DS1992/DS1993 REVISION HISTORY REVISION DATE 7/08 10/08 8/09 4/11 DESCRIPTION Updated the F5 MicroCan face brand with the latest per PCN H020201. Change the last sentence of the Parasite Power section to “The advantages of parasite power are two-fold: 1) by parasiting off this input, battery power is not consumed for 1-Wire ROM function commands, and 2) if the battery is exhausted for any reason, the ROM may still be read normally.