DS2413 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
MFG CO.
'DS2413' PDF : 18 Pages View PDF
DS2413: 1-Wire Dual Channel Addressable Switch
64-BIT LASERED ROM
Each DS2413 has a unique ROM Registration Number that is 64 bits long, as shown in Figure 3. The first eight bits
are a 1-Wire family code. The next 48 bits are a unique serial number. The last eight bits are a CRC (Cyclic
Redundancy Check) of the first 56 bits. The 1-Wire CRC is generated using a polynomial generator consisting of a
shift register and XOR gates as shown in Figure 4. The polynomial is X8 + X5 + X4 + 1. Additional information about
the Dallas 1-Wire CRC is available in Application Note 27. The shift register bits are initialized to zero. Then
starting with the LSB of the family code, one bit at a time is shifted in. After the 8th bit of the family code has been
entered, then the serial number is entered. After the 48th bit of the serial number has been entered, the shift
register contains the CRC value. Shifting in the eight bits of CRC should return the shift register to all zeros.
Figure 2. Hierarchical Structure for 1-Wire Protocol
Command
Level:
1-Wire ROM Function
Commands (see Figure 10)
DS2413
Available
Commands:
Read ROM
Match ROM
Search ROM
Skip ROM
Resume
Overdrive Skip
Overdrive Match
Command Data Field
Codes:
Affected:
33h
55h
F0h
CCh
A5h
3Ch
69h
64-bit Reg. #, RC-Flag
64-bit Reg. #, RC-Flag
64-bit Reg. #, RC-Flag
RC-Flag
RC-Flag
RC-Flag, OD-Flag
64-bit Reg. #, RC-Flag,
OD-Flag
DS2413-specific
PIO Function Commands
(see Figure 6)
PIO Access Read F5h
PIO Access Write 5Ah
PIO Pins
PIO Pins
Figure 3. 64-Bit LASERED ROM
MSB
LSB
8-Bit CRC Code
48-Bit Serial Number
8-Bit Family Code (3Ah)
MSB
LSB MSB
LSB MSB
LSB
Figure 4. 1-Wire CRC Generator
Polynomial = X8 + X5 + X4 + 1
1st
2nd
3rd
4th
STAGE STAGE STAGE STAGE
X0
X1
X2
X3
5th
STAGE
X4
5 of 18
6th
7th
8th
STAGE STAGE STAGE
X5
X6
X7
X8
INPUT DATA
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