DS2431 Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated

Número de pieza

componentes Descripción

Fabricante

DS2431

1024-Bit 1-Wire EEPROM

Dallas Semiconductor -> Maxim Integrated 

DS2431: 1024-Bit, 1-Wire EEPROM

MEMORY FUNCTION EXAMPLE

Write to the first 8 bytes of memory page 1. Read the entire memory.

With only a single DS2431 connected to the bus master, the communication looks like this:

MASTER MODE

TX

RX

TX

TX

TX

TX

TX

RX

TX

RX

TX

TX

RX

RX

RX

RX

RX

TX

RX

TX

TX

TX

TX

TX

----

RX

TX

RX

TX

TX

TX

TX

RX

TX

RX

DATA (LSB FIRST)

(Reset)

(Presence)

CCh

0Fh

20h

00h

<8 data bytes>

<2 bytes CRC16\>

(Reset)

(Presence)

CCh

AAh

20h

00h

07h

<8 data bytes>

<2 bytes CRC16\>

(Reset)

(Presence)

CCh

55h

20h

00h

07h

<1-Wire idle high>

AAh

(Reset)

(Presence)

CCh

F0h

00h

00h

<144 data bytes>

(Reset)

(Presence)

COMMENTS

Reset pulse

Presence pulse

Issue “Skip ROM” command

Issue “Write scratchpad” command

TA1, beginning offset=20h

TA2, address=0020h

Write 8 bytes of data to scratchpad

Read CRC to check for data integrity

Reset pulse

Presence pulse

Issue “Skip ROM” command

Issue “Read scratchpad” command

Read TA1, beginning offset=20h

Read TA2, address=0020h

Read E/S, ending offset=111b, AA, PF = 0

Read scratchpad data and verify

Read CRC to check for data integrity

Reset pulse

Presence pulse

Issue “Skip ROM” command

Issue “copy scratchpad” command

TA1

TA2

(AUTHORIZATION CODE)

E/S

Wait 13 ms for the copy function to complete

Read copy status, AAh = success

Reset pulse

Presence pulse

Issue “Skip ROM” command

Issue “Read Memory” command

TA1, beginning offset=00h

TA2, address=0000h

Read the entire memory

Reset pulse

Presence pulse

PACKAGE INFORMATION

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to

www.maxim-ic.com/DallasPackInfo.)

23 of 23

Maxim/Dallas Semiconductor cannot assume responsibility for use of any circuitry other than circuitry entirely embodied

in a Maxim/Dallas Semiconductor product. No circuit patent licenses are implied. Maxim/Dallas Semiconductor reserves the

right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 2004 Maxim Integrated Products • Printed USA

MAXIM is a registered trademark of Maxim Integrated Products, Inc. DALLAS is a registered trademark of Dallas Semiconductor Corporation.

Share Link: