Rainbow Electronics DS2431 - Manual (Page 23)

DS2431: 1024-Bit, 1-Wire EEPROM
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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.
M a x i m I n t e g r a t e d P r o d u c t s , 1 2 0 S a n G a b r i e l D r i v e , S u n n y v a l e , C A 9 4 0 8 6 4 0 8 - 7 3 7 - 7 6 0 0
© 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.
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 DATA (LSB FIRST) COMMENTS
TX (Reset) Reset pulse
RX (Presence) Presence pulse
TX CCh Issue “Skip ROM” command
TX 0Fh Issue “Write scratchpad” command
TX 20h TA1, beginning offset=20h
TX 00h TA2, address=0020h
TX <8 data bytes> Write 8 bytes of data to scratchpad
RX <2 bytes CRC16\> Read CRC to check for data integrity
TX (Reset) Reset pulse
RX (Presence) Presence pulse
TX CCh Issue “Skip ROM” command
TX AAh Issue “Read scratchpad” command
RX 20h Read TA1, beginning offset=20h
RX 00h Read TA2, address=0020h
RX 07h Read E/S, ending offset=111b, AA, PF = 0
RX <8 data bytes> Read scratchpad data and verify
RX <2 bytes CRC16\> Read CRC to check for data integrity
TX (Reset) Reset pulse
RX (Presence) Presence pulse
TX CCh Issue “Skip ROM” command
TX 55h Issue “copy scratchpad” command
TX 20h TA1
TX 00h TA2 (AUTHORIZATION CODE)
TX 07h E/S
---- <1-Wire idle high> Wait 13 ms for the copy function to complete
RX AAh Read copy status, AAh = success
TX (Reset) Reset pulse
RX (Presence) Presence pulse
TX CCh Issue “Skip ROM” command
TX F0h Issue “Read Memory” command
TX 00h TA1, beginning offset=00h
TX 00h TA2, address=0000h
RX <144 data bytes> Read the entire memory
TX (Reset) Reset pulse
RX (Presence) 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 .)