DS9101 datasheet(49/55 Pages) MAXIM

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Hygrochron Temperature/Humidity Logger

iButton with 8KB Data-Log Memory

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With only a single device connected to the bus master,

the communication of step 2 looks like this:

MASTER MODE

DATA (LSB FIRST)

COMMENTS

(Reset)

Reset pulse

(Presence)

Presence pulse

CCh

Issue “Skip ROM” command

0Fh

Issue “Write Scratchpad” command

00h

TA1, beginning offset = 00h

02h

TA2, address = 0200h

<25 Data Bytes>

Write 25 bytes of data to scratchpad

<7 FFh Bytes>

Write through the end of the scratchpad

(Reset)

Reset pulse

(Presence)

Presence pulse

CCh

Issue “Skip ROM” command

AAh

Issue “Read Scratchpad” command

00h

Read TA1, beginning offset = 00h

02h

Read TA2, address = 0200h

1Fh

Read E/S, ending offset = 1Fh, flags = 0h

<32 Data Bytes>

Read scratchpad data and verify

(Reset)

Reset pulse

(Presence)

Presence pulse

CCh

Issue “Skip ROM” command

99h

Issue “Copy Scratchpad” command

00h

TA1

02h

TA2

1Fh

E/S

(AUTHORIZATION CODE)

<8 FFh Bytes>

Send dummy password

(Reset)

Reset pulse

(Presence)

Presence pulse

MASTER MODE

DATA (LSB FIRST)

COMMENTS

(Reset)

Reset pulse

(Presence)

Presence pulse

CCh

Issue “Skip ROM” command

CCh

Issue “Start Mission” command

<8 FFh Bytes>

Send dummy password

FFh

Send dummy byte

(Reset)

Reset pulse

(Presence)

Presence pulse

Step 3: Start the new mission.

With only a single device connected to the bus master,

the communication of step 3 looks like this:

If step 3 was successful, the MIP bit in the General

Status register is 1, the MEMCLR bit is 0, and the

Mission Start Delay counts down.

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