DS1921 datasheet(4/44 Pages) DALLAS

4 / 44 page

DS1921H/Z

4 of 44

HIERARCHICAL STRUCTURE FOR 1-Wire PROTOCOL Figure 2

1-Wire net

Other

Devices

Bus

Master

Command

Level:

1-Wire ROM Function

Commands

DS1921-Specific

Memory/Control

Function Commands

DS1921

Available

Commands:

Read ROM

Match ROM

Search ROM

Skip ROM

Overdrive Skip

Overdrive Match

Conditional Search

ROM

Write Scratchpad

Read Scratchpad

Copy Scratchpad

Read Memory

Read Memory w/CRC

Clear Memory

Convert Temperature

Data Field

Affected:

64-bit Reg. #

N/A

OD-Flag

64-bit Reg. #, OD-Flag

64-bit Reg. #, Cond. Search settings,

device status

256-bit scratchpad, flags

256-bit scratchpad

4096-bit SRAM, registers, flags

All memory

Mission Time Stamp, Mission Samples

Counter, Start Delay, Sample

Rate, Alarm Time Stamps and

Durations, Histogram Memory

Memory address 211h

Cmd.

Codes:

33h

55h

F0h

CCh

3Ch

69h

ECh

0Fh

AAh

55h

F0h

A5h

3Ch

44h

64-BIT LASERED ROM Figure 3

MSB

LSB

8-Bit

CRC Code

12-Bit Temperature

Range Code

36-Bit Serial Number

8-Bit Family

Code (21h)

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

DEVICE

TEMP.

RANGE (°C)

RESOLUTION

(

°°°°C)

TEMP. RANGE CODE

HEX.

EQUIVALENT

DS1921H-F5

+15 to +46

0.125

0100

1111

0010

4F2

DS1921Z-F5

-5 to +26

0.125

0011

1011

0010

3B2

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