Rainbow-electronics DS2401 Manual do Utilizador descarregar pdf (Página 8)

DS2401

8 of 10

READ/WRITE TIMING DIAGRAM (cont’d) Figure 6

Write-zero Time Slot

60ms £ t

LOW0

< t

SLOT

< 120ms

1ms £ t

REC

< ¥

Read-data Time Slot

60ms £ t

SLOT

< 120ms

1ms £ t

LOWR

< 15ms

0 £ t

RELEASE

< 45ms

1ms £ t

REC

< ¥

RDV

= 15ms

< 1ms

CRC GENERATION

To validate the data transmitted from the DS2401, the bus master may generate a CRC value from the

data as it is received. This generated value is compared to the value stored in the last 8 bits of the

DS2401. If the two CRC values match, the transmission is error-free.

The equivalent polynomial function of this CRC is: CRC = x

+ x

+ 1. For more details, see the

Book of DS19xx iButton Standards.

CUSTOM DS2401

Customization of a portion of the unique 48-bit serial number by the customer is available. Dallas

Semiconductor will register and assign a specific customer ID in the 12 most significant bits of the 48-bit

field. The next most significant bits are selectable by the customer as a starting value, and the least

significant bits are non-selectable and will be automatically incremented by one. Certain quantities and

conditions apply for these custom parts. Contact your Dallas Semiconductor sales representative for more

information.

RESISTOR

MASTER

DS2401

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