参数资料
| 型号： | DS2502S+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/24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
CRC GENERATION
The DS2502 has an 8-bit CRC stored in the most significant byte of the 64-bit ROM. The bus master can
compute a CRC value from the first 56 bits of the 64-bit ROM and compare it to the value stored within
the DS2502 to determine if the ROM data has been received error-free by the bus master. The equivalent
polynomial function of this CRC is: X 8 + X 5 + X 4 +1.
Under certain conditions, the DS2502 also generates an 8-bit CRC value using the same polynomial
function shown above and provides this value to the bus master to validate the transfer of command,
address, and data bytes from the bus master to the DS2502. The Memory Function Flow Chart of Figure
6 indicates that the DS2502 computes an 8-bit CRC for the command, address, and data bytes received
for the Write Memory and the Write Status commands and then outputs this value to the bus master to
confirm proper transfer. Similarly the DS2502 computes an 8-bit CRC for the command and address
bytes received from the bus master for the Read Memory, Read Status, and Read Data/Generate 8-Bit
CRC commands to confirm that these bytes have been received correctly. The CRC generator on the
DS2502 is also used to provide verification of error-free data transfer as each page of data from the 1024-
bit EPROM is sent to the bus master during a Read Data/Generate 8-Bit CRC command, and for the 8
bytes of information in the status memory field.
In each case where a CRC is used for data transfer validation, the bus master must calculate a CRC value
using the polynomial function given above and compare the calculated value to either the 8-bit CRC
value stored in the 64-bit ROM portion of the DS2502 (for ROM reads) or the 8-bit CRC value computed
within the DS2502. The comparison of CRC values and decision to continue with an operation are
determined entirely by the bus master. There is no circuitry on the DS2502 that prevents a command
sequence from proceeding if the CRC stored in or calculated by the DS2502 does not match the value
generated by the bus master. Proper use of the CRC as outlined in the flow chart of Figure 6 can result in
a communication channel with a very high level of integrity. For more details on generating CRC values
including example implementations in both hardware and software, see Application Note 27 .
INITIALIZATION PROCEDURE “RESET AND PRESENCE PULSES” Figure 10
RESISTOR
MASTER
DS2502
480μ s ≤ t RSTL < 960μs
480μs ≤ t RSTH < ∞ (includes recovery time)
15μs ≤ t PDH < 60μs
60μs ≤ t PDL < 240μs
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 |
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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 |
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