DS1994 Просмотр технического описания (PDF) - Maxim Integrated

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DS1994

4Kb Plus Time Memory iButton®

Maxim Integrated 

DS1994

MEMORY FUNCTION EXAMPLES

Example: Write two data Bytes to memory locations 0026h and 0027h (the seventh and eighth Bytes of

page 1). Read entire memory.

MASTER MODE

TX

RX

TX

TX

TX

TX

TX

TX

RX

TX

TX

RX

RX

RX

RX

TX

RX

TX

TX

TX

TX

TX

TX

RX

TX

TX

TX

TX

RX

TX

RX

DATA (LSB FIRST)

Reset

Presence

CCh

0Fh

26h

00h

<2 data Bytes>

Reset

Presence

CCh

AAh

26h

00h

07h

<2 data Bytes>

Reset

Presence

CCh

55h

26h

00h

07h

Reset

Presence

CCh

F0h

00h

00h

<542 Bytes>

Reset

Presence

COMMENTS

Reset pulse (480s–960s)

Presence pulse

Issue skip ROM command

Issue write scratchpad command

TA1, beginning offset = 6

TA2, address = 0026h

Write 2 Bytes of data to scratchpad

Reset pulse

Presence pulse

Issue skip ROM command

Issue read scratchpad command

Read TA1, beginning offset = 6

Read TA2, address = 0026h

Read E/S, ending offset = 7, flags = 0

Read scratchpad data and verify

Reset pulse

Presence pulse

Issue skip ROM command

Issue copy scratchpad command

TA1

TA2 AUTHORIZATION CODE

E/S

Reset pulse

Presence pulse

Issue skip ROM command

Issue read memory command

TA1, beginning offset = 6

TA2, address = 0000h

Read entire memory

Reset pulse

Presence pulse, done

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