DS1925 datasheet(44/46 Pages) MAXIM

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Table 29. Write Setup Data to Register Page 1 Communication

DS1925

iButton High-Capacity Temperature Logger

with 122KB Data-Log Memory

www.maximintegrated.com

Maxim Integrated │ 44

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

<2 byte CRC16>

Read CRC of preceding bytes

(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

66h

Issue “XPC Command” command

0Ch

Issue length byte

99h

Issue “XPC Copy Scratchpad” subcommand

00h

TA1

TA2

(AUTHORIZATION CODE)

E/S

02h

1Fh

<8 FFh bytes>

Send dummy password

<2 byte CRC16>

Read CRC of preceding bytes

FFh

Send release byte

—

Delay to perform XPC Copy Scratchpad in the Clear Memory state

(tLSTD + tSRTC)

FFh

Send dummy byte

(Repeat byte)

Read repeat byte to indicate success

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