Rainbow-electronics DS2422 Manual do Utilizador descarregar pdf (Página 48)

DS2422

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MASTER MODE DATA (LSB FIRST) COMMENTS

TX <7 FFh bytes> Write through the end of the scratchpad

TX (Reset) Reset pulse

RX (Presence) Presence pulse

TX CCh Issue “skip ROM” command

TX AAh Issue “read scratchpad” command

RX 00h Read TA1, beginning offset=00h

RX 02h Read TA2, address=0200h

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

RX <32 data bytes> Read scratchpad data and verify

TX (Reset) Reset pulse

RX (Presence) Presence pulse

TX CCh Issue “skip ROM” command

TX 99h Issue “copy scratchpad” command

TX 00h

TX 02h

TX 1Fh

TA1

TA2 (AUTHORIZATION CODE)

E/S

TX <8 FFh bytes> Send dummy password

TX (Reset) Reset pulse

RX (Presence) Presence pulse

STEP 3

Start the new mission.

With only a single DS2422 connected to the bus master, the communication of step 3 looks like this:

MASTER MODE DATA (LSB FIRST) COMMENTS

TX (Reset) Reset pulse

RX (Presence) Presence pulse

TX CCh Issue “skip ROM” command

TX CCh Issue “start mission” command

TX <8 FFh bytes> Send dummy password

TX FFh Send dummy byte

TX (Reset) Reset pulse

RX (Presence) Presence pulse

If step 3 was successful, the MIP bit in the General Status Register will be 1, the MEMCLR bit will be 0 and the

mission start delay will count down.

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.)

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Rainbow-electronics DS2422 Manual do Utilizador Página 48