DS1922E(2008) Просмотр технического описания (PDF) - Maxim Integrated

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DS1922E
(Rev.:2008)

High-Temperature Logger iButton with 8KB Data-Log Memory

Maxim Integrated 

High-Temperature Logger iButton with 8KB

Data-Log Memory

BUS

MASTER

1-Wire NET

OTHER DEVICES

COMMAND LEVEL:

1-Wire ROM

FUNCTION COMMANDS

DS1922E-SPECIFIC

MEMORY FUNCTION COMMANDS

DS1922E

AVAILABLE COMMANDS:

READ ROM

MATCH ROM

SEARCH ROM

CONDITIONAL SEARCH ROM

SKIP ROM

RESUME

OVERDRIVE-SKIP ROM

OVERDRIVE-MATCH ROM

DATA FIELD AFFECTED:

64-BIT ROM, RC-FLAG

64-BIT ROM, RC-FLAG

64-BIT ROM, RC-FLAG

64-BIT ROM, RC-FLAG, ALARM FLAGS, SEARCH CONDITIONS

RC-FLAG

RC-FLAG

RC-FLAG, OD-FLAG

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

WRITE SCRATCHPAD

READ SCRATCHPAD

COPY SCRATCHPAD WITH PW

READ MEMORY WITH PW AND CRC

CLEAR MEMORY WITH PW

FORCED CONVERSION

START MISSION WITH PW

STOP MISSION WITH PW

256-BIT SCRATCHPAD, FLAGS

256-BIT SCRATCHPAD

512-BYTE DATA MEMORY, REGISTERS, FLAGS, PASSWORDS

MEMORY, REGISTERS, PASSWORDS

MISSION TIMESTAMP, MISSION SAMPLES COUNTER,

START DELAY, ALARM FLAGS, PASSWORDS

MEMORY ADDRESSES 020Ch TO 020Dh

FLAGS, TIMESTAMP, MEMORY ADDRESSES

020Ch TO 020Dh (WHEN LOGGING)

FLAGS

Figure 2. Hierarchical Structure for 1-Wire Protocol

MSB

8-BIT

CRC CODE

MSB

LSB MSB

Figure 3. 64-Bit Lasered ROM

48-BIT SERIAL NUMBER

POLYNOMIAL = X8 + X5 + X4 + 1

LSB

8-BIT FAMILY CODE

(41h)

LSB MSB

LSB

1ST

STAGE

2ND

STAGE

3RD

STAGE

4TH

STAGE

X0

X1

X2

X3

Figure 4. 1-Wire CRC Generator

5TH

STAGE

X4

6TH

STAGE

7TH

STAGE

8TH

STAGE

X5

X6

X7

X8

INPUT DATA

8 _______________________________________________________________________________________

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