DS2405P(1999) Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated

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Fabricante

DS2405P
(Rev.:1999)

Addressable Switch

Dallas Semiconductor -> Maxim Integrated 

READ/WRITE TIMING DIAGRAM Figure 6 (cont.)

Read-Data Time Slot

DS2405

RESISTOR

MASTER

DS2405

60 µs ≤tSLOT < 120 µs

1 µs ≤tLOWR < 15 µs

0 ≤tRELEASE < 45 µs

1 µs ≤tREC < ∞

tRDV = 15 µs

tSU < 1 µs

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 = x8 + x5 + x4 + 1

For more details, see the Book of DS19xx iButton Standards.

CUSTOM DS2405

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 special order parts. Contact your Dallas Semiconductor sales representative for

more information.

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