DS28E05 datasheet(5/17 Pages) MAXIM

Part #	DS28E05

Description	Single-Contact 1-Wire Interface

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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DS28E05

1-Wire EEPROM

www.maximintegrated.com

Maxim Integrated │ 5

Figure 1. Block Diagram

Figure 2. Hierarchical Structure for 1-Wire Protocol

Figure 3. 64-Bit ROM ID

ThepolynomialisX8+X5+X4+1.Additionalinformation

aboutthe1-WireCyclicRedundancyCheckisavailable

in ApplicationNote27:Understanding and Using Cyclic

Redundancy Checks with Maxim iButton® Products.

The shift register bits are initialized to 0. Then, starting

withtheleastsignificantbitofthefamilycode,onebitat

atimeisshiftedin.Afterthe8thbitofthefamilycodehas

beenentered,theserialnumberisentered.Afterthelast

bitoftheserialnumberhasbeenentered,theshiftreg-

istercontainstheCRCvalue.Shiftinginthe8bitsofthe

CRCreturnstheshiftregistertoall0s.

iButton is a registered trademark of Maxim Integrated

Products, Inc.

DS28E05

1-Wire FUNCTION

CONTROL

1-Wire NET

PARASITE POWER

64-BIT

ROM ID

ADMINISTRATIVE DATA

(64 BITS)

USER EEPROM

7 PAGES OF

(128 BITS EACH)

MEMORY

FUNCTION

CONTROL

AVAILABLE COMMANDS:

DATA FIELD AFFECTED:

READ ROM

MATCH ROM

SEARCH ROM

SKIP ROM

RESUME

64-BIT ROM ID, RC-FLAG

RC-FLAG

1-Wire ROM

FUNCTION COMMANDS

WRITE MEMORY

READ MEMORY

USER MEMORY, ADMINISTRATIVE DATA

DS28E05-SPECIFIC

MEMORY FUNCTION COMMANDS

COMMAND LEVEL:

DS28E05

MSb

8-BIT

CRC CODE

48-BIT SERIAL NUMBER

MSb

LSb MSb

LSb

8-BIT FAMILY CODE

(0Dh)

MSb

LSb

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