DS2401X1_06 데이터 시트보기 (PDF) - Maxim Integrated

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DS2401X1_06

Silicon Serial Number

Maxim Integrated 

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

Write-zero Time Slot

DS2401

Read-data Time Slot

60μs ≤ tLOW0 < tSLOT < 120μs

1μs ≤ tREC < ∞

RESISTOR

MASTER

DS2401

60μs ≤ tSLOT < 120μs

1μs ≤ tLOWR < 15μs

0 ≤ tRELEASE < 45μs

1μs ≤ tREC < ∞

tRDV = 15μs

tSU < 1μs

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 = x8 + x5 + x4 + 1. Additional information about

the Dallas 1-Wire CRC is available in Application Note 27.

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.

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