参数资料
| 型号： | DS2431P+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/27页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 1KBIT 6TSOC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 4,000 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 1K（256 x 4） |
| 接口： | 1 线 串行 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 6-LSOJ |
| 供应商设备封装： | 6-TSOC |
| 包装： | 带卷 (TR) |
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DS2431
1024-Bit, 1-Wire EEPROM
AVAILABLE COMMANDS:
DATA FIELD AFFECTED:
DS2431 COMMAND LEVEL:
1-Wire ROM FUNCTION COMMANDS
(SEE FIGURE 9)
DS2431-SPECIFIC
MEMORY FUNCTION COMMANDS
(SEE FIGURE 7)
Figure 2. Hierarchical Structure for 1-Wire Protocol
MSB
8-BIT
CRC CODE
READ ROM
MATCH ROM
SEARCH ROM
SKIP ROM
RESUME
OVERDRIVE-SKIP ROM
OVERDRIVE-MATCH ROM
WRITE SCRATCHPAD
READ SCRATCHPAD
COPY SCRATCHPAD
READ MEMORY
48-BIT SERIAL NUMBER
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
64-BIT SCRATCHPAD, FLAGS
64-BIT SCRATCHPAD
DATA MEMORY, REGISTER PAGE
DATA MEMORY, REGISTER PAGE
8-BIT FAMILY CODE
(2Dh)
LSB
MSB
LSB MSB
LSB MSB
LSB
Figure 3. 64-Bit Lasered ROM
The hierarchical structure of the 1-Wire protocol is
shown in Figure 2. The bus master must first provide
one of the seven ROM function commands: Read ROM,
Match ROM, Search ROM, Skip ROM, Resume,
Overdrive-Skip ROM, or Overdrive-Match ROM. Upon
completion of an Overdrive-Skip ROM or Overdrive-
Match ROM command byte executed at standard
speed, the device enters overdrive mode where all
subsequent communication occurs at a higher speed.
The protocol required for these ROM function com-
mands is described in Figure 9. After a ROM function
command is successfully executed, the memory func-
tions become accessible and the master can provide
any one of the four memory function commands. The
protocol for these memory function commands is
described in Figure 7. All data is read and written
least significant bit first.
64-Bit Lasered ROM
Each DS2431 contains a unique ROM code that is 64
bits long. The first 8 bits are a 1-Wire family code. The
next 48 bits are a unique serial number. The last 8 bits
are a cyclic redundancy check (CRC) of the first 56 bits.
See Figure 3 for details. The 1-Wire CRC is generated
using a polynomial generator consisting of a shift regis-
ter and XOR gates as shown in Figure 4. The polynomial
is X 8 + X 5 + X 4 + 1. Additional information about the
1-Wire CRC is available in Application Note 27:
Understanding and Using Cyclic Redundancy Checks
with Maxim iButton ? Products.
The shift register bits are initialized to 0. Then, starting
with the least significant bit of the family code, one bit
at a time is shifted in. After the 8th bit of the family code
has been entered, the serial number is entered. After
the last bit of the serial number has been entered, the
shift register contains the CRC value. Shifting in the 8
bits of the CRC returns the shift register to all 0s.
iButton is a registered trademark of Maxim Integrated Products, Inc.
6
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2431Q R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1024-Bit, 1-Wire EEPROM |
| DS2431Q T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1024-Bit, 1-Wire EEPROM |
| DS2431Q+R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1024-Bit, 1-Wire EEPROM Individual Memory Pages Can Be Permanently |
| DS2431Q+T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1024-Bit, 1-Wire EEPROM Individual Memory Pages Can Be Permanently |
| DS2431Q+T&R | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:EEPROM SERL-1WIRE 1KBIT 4PAGES X 256 3.3V/5V 6TDFN EP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC EEPROM 1KBIT 6TDFN 制造商:Maxim Integrated Products 功能描述:EEPROM 1024-Bit 1-Wire EEPROM |
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