DS28E05 데이터 시트보기 (PDF) - Maxim Integrated
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DS28E05 Datasheet PDF : 17 Pages
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DS28E05
1-Wire EEPROM
POLYNOMIAL = X8 + X5 + X4 + 1
1ST
STAGE
2ND
STAGE
3RD
STAGE
4TH
STAGE
X0
X1
X2
X3
Figure 4. 1-Wire CRC Generator
5TH
STAGE
X4
6TH
STAGE
7TH
STAGE
8TH
STAGE
X5
X6
X7
X8
INPUT DATA
Table 1. Memory Resources
NAME
User memory (EEPROM)
Administrative data
ROM ID
SIZE
(BYTES)
112
8
8
ACCESS MODE
Read, (Write)
Read, (Write),
Internal Read
Read, Internal
Read
PURPOSE
Application-specific data storage
Page protection settings, factory bytes, user bytes/manufacturer ID
1-Wire network device address
Table 2. Address to Segment Mapping
Segment 7 Segment 6 Segment 5 Segment 4 Segment 3 Segment 2 Segment 1
B1 B0 B1 B0 B1 B0 B1 B0 B1 B0 B1 B0 B1 B0
Page 0 (0Fh)
(08h)
Page 1 (1Fh)
(18h)
Page 2 (2Fh)
(28h)
Page 3 (3Fh)
(38h)
Page 4 (4Fh)
(48h)
Page 5 (5Fh)
(58h)
Page 6 (6Fh)
(68h)
Page 7
ROM ID
Factory
MAN. ID/U. PPD PPC
Legend: (5Fh) → designates memory location 5Fh. Text without brackets refers to the register name.
Segment 0
B1 B0
(00h)
(10h)
(20h)
(30h)
(40h)
(50h)
(60h)
PPB PPA
Memory Resources
The memory of the DS28E05 consists of user memory,
administrative data, and a ROM ID. Table 1 shows the
size, access mode and purpose of the various memory
areas. Brackets around an access mode indicate possible
restrictions, such as write protection or read protection.
The memory is organized as 8 pages of 16 bytes each
(Figure 5). Each page consists of 8 segments. Table 2
shows how the segments relate to a memory address.
Pages 0 to 6 are the user memory. Page 7 contains
the administrative data and the ROM ID. The function
memory locations 0074h to 0075h depends on the code
in the Factory Word (addresses 0076h to 0077h). The
Manufacturer ID can be a customer-supplied identification
code that assists the application software in identifying
the product the DS28E05 is associated with. Contact the
factory to set up and register a custom manufacturer ID.
Write protection or EPROM emulation mode is activated
through the Write Memory command by writing to the
corresponding locations (PPA to PPD) in the administra-
tive data page. Once a protection is activated, it cannot
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