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參數(shù)資料
| 型號(hào)： | DS2502-E48 |
| 英文描述： | 48-Bit Node Address Chip |
| 中文描述： | 48位節(jié)點(diǎn)地址芯片 |
| 文件頁(yè)數(shù)： | 2/2頁(yè) |
| 文件大?。?/td> | 142K |
| 代理商： | DS2502-E48 |
DS2502-E48
2 of 2
The first 32 bytes of the DS2502-E48’s EPROM memory contain a globally unique 48-bit node address
and are write-protected. The data structure follows the conventions of UniqueWare devices using Default
Data Structure (Figure 1).
Figure 1. NODE ADDRESS CHIP DATA STRUCTURE
CRC16
MSB LSB
MSB LSB
19 bytes
FFH
high address
(unused)
Company ID Value
Extension ID
Value
MSB LSB
Project ID
MSB LSB
4 bytes constant
00001129H
Length
2 bytes
3 bytes constant
006035H
3 bytes serialization
1 byte 0AH
low address
The data record starts with a length byte (0AH) and the 4-byte UniqueWare Project ID 00001129H. The
next 6 bytes contain the 48-bit node address which consists of an incrementing 24-bit extension identifier
and the IEEE-assigned 24-bit company ID value 006035H. A 16-bit CRC ends the data record. The
remaining bytes of the 32-byte memory page remain unprogrammed. Neither the 24-bit extension
identifier nor the 24-bit company ID are related to the 64-bit ROM registration number. The ROM
registration number is used to provide a unique address to access the DS2502-E48 when multidropped on
a 1-Wire bus.
The company ID value 006035H has been assigned by the IEEE to Dallas Semiconductor. If a different
UniqueWare Project Setup Manual.Assume that a manufacturer’s company ID value is 006035H and the 24-bit extension identifier is
67ABCDH. The 48-bit node address value generated from these two numbers is 00603567ABCDH,
whose byte and bit representations are illustrated in Figure 2.
Figure 2. SAMPLE NODE ADDRESS VALUE
MOST SIGNIFICANT BYTE
00
60
0000 0000
0110 0000
0011 0101
MOST SIGNIFICANT BIT
LEAST SIGNIFICANT BYTE
35
67
AB
CD
HEX
BINARY
0110 0111
1010 1011
1100 1101
LEAST SIGNIFICANT BIT
This information is stored in the DS2502-E48 as 48-bit number with the least significant byte at the lower
address. Including the length byte and the CRC, the complete set of data is shown in Figure 3.
Figure 3. PHYSICAL ADDRESS AND DATA MAPPING INSIDE THE DEVICE
ADDRESS
0C
0B
0A
09
08
07
06
05
04
03
02
01
00
DATA
XX
XX
00
60
35
67
AB
CD
00
00
11
29
0A
XX XX = CRC16, value depends on actual data
The four bytes at memory addresses 01 to 04 contain the UniqueWare Project ID 00001129H. The two
bytes at addresses 0BH and 0CH are the 16-bit CRC over the length byte, Project ID and node address
value. The least significant byte of the CRC is stored at address 0B. This CRC is generated according to
the standardized CRC16 polynomial function X
16
+ X
15
+ X
2
+ 1. For more details on generating CRC
values including examples in both hardware and software, see Application Note 27.
The contents of the memory address range 0DH to 1FH is FFH. These cells cannot be altered since the
whole memory page is write-protected. The memory range from 20H to 7FH, however, is user-
programmable. It can be write-protected by programming the corresponding write-protect bit in the status
memory of the DS2502-E48.
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參數(shù)描述 |
|---|---|
| DS2502-E48+ | 功能描述:可擦除可編程ROM 1Kb Add-Only Memory RoHS:否 制造商:Maxim Integrated 類型: 存儲(chǔ)容量:1024 bit 組織:1 K x 1 接口類型: 工作電流:5 uA 編程電壓: 工作電源電壓:2.8 V to 6 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-92 |
| DS2502-E64 | 制造商:Maxim Integrated Products 功能描述:IEEE EUI-64 NODE ADDR TO92 - Rail/Tube |
| DS2502-E64+ | 功能描述:可擦除可編程ROM 1Kb Add-Only Memory RoHS:否 制造商:Maxim Integrated 類型: 存儲(chǔ)容量:1024 bit 組織:1 K x 1 接口類型: 工作電流:5 uA 編程電壓: 工作電源電壓:2.8 V to 6 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-92 |
| DS2502G+T&R | 制造商:Maxim Integrated Products 功能描述:ADD-O MEM 1KBSFN T&R (GENERIC) LF - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC OTP 1KBIT 2SFN |
| DS2502G+T&R | 功能描述:可擦除可編程ROM 1Kb Add-Only Memory RoHS:否 制造商:Maxim Integrated 類型: 存儲(chǔ)容量:1024 bit 組織:1 K x 1 接口類型: 工作電流:5 uA 編程電壓: 工作電源電壓:2.8 V to 6 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-92 |
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