DS1904L-F5 Maxim Integrated Products, DS1904L-F5 Datasheet - Page 3

• Manufacturer Part Number: DS1904L-F5
• Description: RTC Ibutton
• Manufacturer: Maxim Integrated Products

HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 2
64-BIT LASERED ROM Figure 3
1-WIRE CRC GENERATOR Figure 4
X
0
STAGE
MSB
MSB
1ST
Master
Command
Level
8-Bit CRC Code
Bus
X
Commands (see Figure
1
STAGE
1-Wire ROM
2ND
DS1904
Function
(see Figure
X
2
STAGE
3RD
LSB
X
3
STAGE
MSB
4TH
Polynomial = X
1-Wire Bus
48-Bit Serial Number
Available
Commands
Read
Match
Search
Skip
Write
Read
DS1904
8
X
4
3 of 12
+ X
STAGE
5TH
5
+ X
4
+ 1
Data Fields
Affected
64-bit
64-bit
64-bit
N/A
RTC Counter, Device
RTC Counter, Device
LSB
Other
Devices
X
5
STAGE
MSB
6TH
8-Bit Family Code (24h)
R
INPUT DATA
X
6
STAGE
S
7TH
X
7
STAGE
8TH
LSB
LSB
X
8