DS9101 datasheet(45/55 Pages) MAXIM

45 / 55 page

Hygrochron Temperature/Humidity Logger

iButton with 8KB Data-Log Memory

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ing in the command code, the target addresses TA1

and TA2, and all the data bytes. The DS1923 transmits

this CRC only if the data bytes written to the scratchpad

include scratchpad ending offset 11111b. The data can

start at any location within the scratchpad.

With the Read Scratchpad command, the CRC is gen-

erated by first clearing the CRC generator and then

shifting in the command code, the target addresses

TA1 and TA2, the E/S byte, and the scratchpad data

starting at the target address. The DS1923 transmits

this CRC only if the reading continues through the end

of the scratchpad, regardless of the actual ending off-

set. For more information on generating CRC values,

refer to Application Note 27.

Command-Specific 1-Wire Communication Protocol—Legend

SYMBOL

DESCRIPTION

RST

1-Wire reset pulse generated by master.

1-Wire presence pulse generated by slave.

Select

Command and data to satisfy the ROM function protocol.

Command “Write Scratchpad.”

Command “Read Scratchpad.”

CPS

Command “Copy Scratchpad with Password.”

RMC

Command “Read Memory with Password and CRC.”

Command “Clear Memory with Password.”

Command “Forced Conversion.”

Command “Start Mission with Password.”

STP

Command “Stop Mission with Password.”

Target Address TA1, TA2.

TA–E/S

Target Address TA1, TA2 with E/S byte.

Transfer of as many data bytes as are needed to reach the scratchpad offset 1Fh.

Transfer of as many data bytes as are needed to reach the end of a memory page.

Transfer as many bytes as are needed to reach the end of the data-log memory.

Transfer of 8 bytes that either represent a valid password or acceptable dummy data.

<32 Bytes>

Transfer of 32 bytes.

<Data>

Transfer of an undetermined amount of data.

FFh

Transmission of one FFh byte.

CRC-16

Transfer of an inverted CRC-16.

FF Loop

Indefinite loop where the master reads FF bytes.

AA Loop

Indefinite loop where the master reads AA bytes.

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