DS28E05 データシートの表示（PDF） - Maxim Integrated

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DS28E05

1-Wire EEPROM

Maxim Integrated 

DS28E05

1-Wire EEPROM

PARASITE POWER

1-Wire NET

1-Wire FUNCTION

CONTROL

64-BIT

ROM ID

Figure 1. Block Diagram

DS28E05

MEMORY

FUNCTION

CONTROL

USER EEPROM

7 PAGES OF

(128 BITS EACH)

ADMINISTRATIVE DATA

(64 BITS)

COMMAND LEVEL:

1-Wire ROM

FUNCTION COMMANDS

AVAILABLE COMMANDS:

READ ROM

MATCH ROM

SEARCH ROM

SKIP ROM

RESUME

DS28E05

DATA FIELD AFFECTED:

64-BIT ROM ID, RC-FLAG

64-BIT ROM ID, RC-FLAG

64-BIT ROM ID, RC-FLAG

RC-FLAG

RC-FLAG

DS28E05-SPECIFIC

MEMORY FUNCTION COMMANDS

WRITE MEMORY

READ MEMORY

USER MEMORY, ADMINISTRATIVE DATA

USER MEMORY, ADMINISTRATIVE DATA

Figure 2. Hierarchical Structure for 1-Wire Protocol

MSb

8-BIT

CRC CODE

MSb

LSb MSb

Figure 3. 64-Bit ROM ID

48-BIT SERIAL NUMBER

LSb

8-BIT FAMILY CODE

(0Dh)

LSb MSb

LSb

The polynomial is X8 + X5 + X4 + 1. Additional information

about the 1-Wire Cyclic Redundancy Check is available

in Application Note  27: Understanding and Using Cyclic

Redundancy Checks with Maxim iButton® Products.

iButton is a registered trademark of Maxim Integrated

Products, Inc.

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

with the least significant bit of the family code, one bit at

a time is shifted in. After the 8th bit of the family code has

been entered, the serial number is entered. After the last

bit of the serial number has been entered, the shift reg-

ister contains the CRC value. Shifting in the 8 bits of the

CRC returns the shift register to all 0s.

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