DS1921 datasheet(34/44 Pages) DALLAS

34 / 44 page

DS1921H/Z

34 of 44

Command-Specific 1-Wire Communication Protocol — Color Codes

Master to slave

Slave to master

Write Scratchpad, reaching the end of the Scratchpad

RST

Select

CRC16\

FF loop

Write Scratchpad, not reaching the end of the Scratchpad

RST

Select

<data>

RST

Read Scratchpad

RST

Select

TA-E/S

CRC16\

FF loop

Copy Scratchpad (success)

RST

Select

CPS

TA-E/S

AA loop

Copy Scratchpad (invalid TA-E/S)

RST

Select

CPS

TA-E/S

FF loop

Read Memory (success)

RST

Select

00 loop

Read Memory (invalid address)

RST

Select

00 loop

Reading reserved pages 20 through 63 or 68 through 127 or pages 192 and higher (beyond datalog

memory) will result in 00h bytes.

Read Memory with CRC (success)

RST

Select

RMC

CRC16\

<32 bytes>

CRC16\

The "32 bytes" are either valid page data or 00h bytes when reading reserved pages 20 through 63 or 68

through 127 or pages 192 and higher (beyond datalog memory).

Loop

DS1921 Datasheet(PDF) 34 Page - Dallas Semiconductor

DS1921 Datasheet(HTML) 34 Page - Dallas Semiconductor

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