DS1921 Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated

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componentes Descripción

Fabricante

DS1921

Thermochron iButton

Dallas Semiconductor -> Maxim Integrated 

DS1921G Thermochron iButton

Figure 2. HIERARCHICAL STRUCTURE FOR 1-Wire PROTOCOL

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

0Fh 256-bit scratchpad, flags

Read Scratchpad

AAh 256-bit scratchpad

Copy Scratchpad

55h 4096-bit SRAM, registers, flags

Read Memory

F0h All memory

Read Memory w/CRC A5h All memory

Clear Memory

3Ch Mission Time Stamp, Mission Samples

Counter, Start Delay, Sample

Rate, Alarm Time Stamps and

Durations, Histogram Memory

Convert Temperature 44h Memory address 211h

Figure 3. 64-BIT LASERED ROM

MSB

8-Bit

CRC Code

MSB

LSB

MSB

48-Bit Serial Number

LSB

8-Bit Family

Code (21h)

LSB MSB

LSB

4 of 45

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