参数资料
| 型号： | DS2502S+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC OTP 1KBIT 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 格式 - 存储器： | EPROMs |
| 存储器类型： | EPROM OTP |
| 存储容量： | 1K（1K x 1） |
| 接口： | 1 线 串行 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
DS2502
the 1-Wire line as well as indicate to the bus master how many and what types of devices are present. The
protocol required for these ROM Function Commands is described in Figure 9. After a ROM Function
Command is successfully executed, the memory functions that operate on the EPROM portions of the
DS2502 become accessible and the bus master may issue any one of the five Memory Function
Commands specific to the DS2502 to read or program the various data fields. The protocol for these
Memory Function Commands is described in Figure 5. All data is read and written least significant bit
first.
64-BIT LASERED ROM
Each DS2502 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 CRC of the first 56 bits. (See Figure 3).
The 64-bit ROM and ROM Function Control section allow the DS2502 to operate as a 1-Wire device and
follow the 1-Wire protocol detailed in the section “1-Wire Bus System.” The memory functions required
to read and program the EPROM sections of the DS2502 are not accessible until the ROM function
protocol has been satisfied. This protocol is described in the ROM functions flow chart (Figure 9). The 1-
Wire bus master must first provide one of four ROM function commands: 1) Read ROM, 2) Match ROM,
3) Search ROM, or 4) Skip ROM. After a ROM function sequence has been successfully executed, the
bus master may then provide any one of the memory function commands specific to the DS2502 (Figure
6).
The 1-Wire CRC of the lasered ROM is generated using the polynomial X 8 + X 5 + X 4 + 1. Figure 4
shows a hardware implementation of this CRC generator. Additional information about the Maxim
1-Wire Cyclic Redundancy Check is available in Application Note 27 . The shift register acting as the
CRC accumulator is initialized to 0. Then starting with the least significant bit of the family code, 1 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 48 th bit of the serial number has been entered, the shift register contains the CRC
value. Shifting in the 8 bits of CRC should return the shift register to all 0s.
DS2502 BLOCK DIAGRAM Figure 1
PARASITE POWER
1-WIRE BUS
DATA
PROGRAM
VOLTAGE
DETECT
1-WIRE FUNCTION
CONTROL
MEMORY
FUNCTION
CONTROL
64-BIT LASERED
ROM
8-BIT
SCRATCHPAD
8-BIT CRC
GENERATOR
1024-BIT EPROM
(4 PAGES OF 32 BYTES)
EPROM
STATUS BYTES
相关PDF资料 |
PDF描述 |
|---|---|
| AYF534965 | CONN SOCKET FPC 0.5MM 49POS SMD |
| DS2430A+T&R | IC EEPROM 256BIT TO92-3 |
| AYF534865 | CONN SOCKET FPC 0.5MM 48POS SMD |
| DS2502G+U | IC ADD-ONLY MEMORY 1KB SFN |
| DS2502G+T&R | IC OTP 1KBIT 2SFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2502S-UNW | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:UniqueWare Add-Only Memory |
| DS2502S-UNW-115F/T&R | 功能描述:可擦除可编程ROM RoHS:否 制造商:Maxim Integrated 类型: 存储容量:1024 bit 组织:1 K x 1 接口类型: 工作电流:5 uA 编程电压: 工作电源电压:2.8 V to 6 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:TO-92 |
| DS2502S-UNW-PPPP | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:UniqueWare Add-Only Memory |
| DS2502T | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:1 kbit Add-Only Memory |
| DS2502TR+T&R | 制造商:Maxim Integrated Products 功能描述:EEPROM SERL-1WIRE 1KBIT 4PAGES X 256 3.3V/5V 3PIN TO-92 - Tape and Reel |
发布紧急采购，3分钟左右您将得到回复。