DS1921H データシートの表示（PDF） - Maxim Integrated

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DS1921H

High-Resolution Thermochron iButton Range H: +15°C to +46°C; Z: -5°C to +26°C

Maxim Integrated 

DS1921H/Z

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 eighth bit of the family code has been entered, then the serial

number followed by the temperature range code is entered. After the range code has been entered, the

shift register contains the CRC value. Shifting in the eight bits of CRC returns the shift register to all 0s.

HIERARCHICAL STRUCTURE FOR 1-Wire PROTOCOL Figure 2

Bus

Master

1-Wire net

Other

Devices

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

Cmd. Data Field

Codes: Affected:

33h

55h

F0h

CCh

3Ch

69h

ECh

64-bit Reg. #

64-bit Reg. #

64-bit Reg. #

N/A

OD-Flag

64-bit Reg. #, OD-Flag

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

device status

Write Scratchpad

Read Scratchpad

Copy Scratchpad

Read Memory

Read Memory w/CRC

Clear Memory

Convert Temperature

0Fh 256-bit scratchpad, flags

AAh 256-bit scratchpad

55h 4096-bit SRAM, registers, flags

F0h All memory

A5h All memory

3Ch Mission Time Stamp, Mission Samples

Counter, Start Delay, Sample

Rate, Alarm Time Stamps and

Durations, Histogram Memory

44h Memory address 211h

64-BIT LASERED ROM Figure 3

MSB

8-Bit

CRC Code

12-Bit Temperature

Range Code

MSB

LSB MSB

LSB

36-Bit Serial Number

MSB

LSB

LSB

8-Bit Family

Code (21h)

MSB

LSB

DEVICE

DS1921H-F5

DS1921Z-F5

TEMP.

RANGE (°C)

+15 to +46

-5 to +26

RESOLUTION

(°C)

0.125

0.125

TEMP. RANGE CODE

0100

0011

1111

1011

0010

0010

HEX.

EQUIVALENT

4F2

3B2

4 of 45

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