DS1977-F5 データシートの表示（PDF） - Dallas Semiconductor -> Maxim Integrated

部品番号

コンポーネント説明

メーカー

DS1977-F5

32KB EEPROM iButton

Dallas Semiconductor -> Maxim Integrated 

ROM ID field

Like all 1-Wire devices, the DS1977 has a 64-bit lasered ROM identification field. The Family

code of the DS1977 in the 64-bit ROM is to be assigned.

Figure 1. 64-BIT LASERED ROM

MSB

8-Bit

CRC Code

48-Bit Serial Number

MSB LSB MSB

LSB

8-Bit Family

Code (__h)

LSB MSB

LSB

Figure 2. Command Hierarchy

BUS

MASTER

1-Wire net

OTHER

DEVICES

DS1977

COMMAND

LEVEL

1-WIRE ROM FUNCTION

COMMANDS

DS1977 SPECIFIC

FUNCTION COMMANDS

AVAILABLE COMMANDS

READ ROM

MATCH ROM

SEARCH ROM

SKIP ROM

OVERDRIVE MATCH ROM

OVERDRIVE SKIP ROM

RESUME

DATA FIELDS

AFFECTED

64-BIT ROM, RC-FLAG

64-BIT ROM, RC-FLAG

64-BIT ROM, RC-FLAG

RC-FLAG

64-BIT ROM, RC-FLAG, OD-FLAG

RC-FLAG, OD-FLAG

RC-FLAG

WRITE SCRATCHPAD

READ SCRATCHPAD

COPY SCRATCHPAD w/PW

READ MEMORY w/PW

VERIFY PASSWORD

READ VERSION

64-BYTE SCRATCHPAD

64-BYTE SCRATCHPAD

DATA MEMORY, PASSWORDS,

PASSWORD ENABLE BYTE

DATA MEMORY, PASSWORDS,

PASSWORD ENABLE BYTE

PASSWORDS

CONTROL REGISTER

Figure 3. Device Memory Map

ADDRESS RANGE ACCESS TYPE

0000h to 003Fh

R/W

0040h to 007Fh

R/W

0080h to 7F7Fh

R/W

7F80h to 7FBFh

R/W

7FC0h to 7FC7h

W

7FC8h to 7FCFh

W

7FD0h

R/W

7FD1h to 7FFFh

-----

DESCRIPTION

User Data Memory Page 0

User Data Memory Page 1

User Data Memory Pages 2 to 509

User Data Memory Page 510

Read Access Password (A)

Read/Write Access Password (B)

Password Control Register

(reserved)

Page 2

1/31/03

Share Link: