Rainbow-electronics DS2405 Manual de usuario descargar pdf (Pagina 13)

DS2405

13 of 15

READ/WRITE TIMING DIAGRAM Figure 6 (cont.)

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 DS2405, 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

DS2405. 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.

RESISTOR

MASTER

DS2405

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Rainbow-electronics DS2405 Manual de usuario Pagina 13