DS1922L datasheet(13/48 Pages) DALLAS

13 / 48 page

DS1922L/DS1922T

13 of 48

Figure 2. Hierachical Structure for 1-Wire Protocol

1-Wire net

Other

Devices

BUS

Master

DS1922L, DS1922T

Available

Commands:

Command

Level:

Data Field

Affected:

1-Wire ROM Function

Commands

DS1922-Specific

Memory Function

Commands

Read ROM

Match ROM

Search ROM

Conditional Search ROM

Skip ROM

Resume

Overdrive Skip

Overdrive Match

64-bit ROM, RC-Flag

64-bit ROM, RC-Flag, Alarm Flags,

Search Conditions

RC-Flag

RC-Flag, OD-Flag

64-bit ROM, RC-Flag, OD-Flag

Write Scratchpad

Read Scratchpad

Copy Scratchpad w/PW

Read Memory w/PW &

w/CRC

Clear Memory w/PW

Forced Conversion

Start Mission w/PW

Stop Mission w/PW

256-bit Scratchpad, Flags

256-bit Scratchpad

512 byte Data Memory, Registers,

Flags, Passwords

Memory, Registers, Passwords

Mission Time Stamp, Mission Samples

Counter, Start Delay, Alarm

Flags, Passwords

Memory addresses 020Ch to 020Dh

Flags, Timestamp, Memory addresses

020Ch to 020Dh (when logging)

Flags

Figure 3. 64-Bit Lasered ROM

MSB

LSB

8-Bit

CRC Code

48-Bit Serial Number

8-Bit Family

Code (41h)

MSB

LSB

MSB

LSB

MSB

LSB

Figure 4. 1-Wire CRC Generator

Polynomial = X

8 + X5 + X4 + 1

STAGE

INPUT DATA

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