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参数资料
| 型号： | DS2423P/T&R |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Memory IC:Other |
| 英文描述： | SPECIALTY MEMORY CIRCUIT, PDSO6 |
| 封装： | 3.70 X 4 MM, 1.50 MM HEIGHT, TSOC-6 |
| 文件页数： | 24/25页 |
| 文件大小： | 581K |
| 代理商： | DS2423P/T&R |
DS2423
8 of 25
Read Memory [F0H]
The read memory command may be used to read the entire memory. After issuing the command, the
master must provide the 2-byte target address. After the two bytes, the master reads data beginning from
the target address and may continue until the end of memory, at which point logic 1s will be read. It is
important to realize that the target address registers will contain the address provided. The ending
offset/data status byte is unaffected.
The hardware of the DS2423 provides a means to accomplish error-free writing to the memory section.
To safeguard reading data in the 1-Wire environment and to simultaneously speed up data transfers, it is
recommended to packetize data into data packets of the size of one memory page each. Such a packet
would typically store a 16-bit CRC with each page of data to ensure rapid, error-free data transfers that
eliminate having to read a page multiple times to determine if the received data is correct or not. (See
Application Note 114 for the recommended file structure.)
Read Memory + Counter [A5H]
The Read Memory + Counter command is used to read memory data together with the write cycle counter
or externally triggered counter associated with the addressed page of data memory. The additional
information is transmitted by the DS2423 as the end of a memory page is encountered. Following the
current value of the counter the DS2423 transmits 32 0-bits and a 16-bit CRC generated by the DS2423.
After having sent the command code of the Read Memory + Counter command, the bus master sends a
two-byte address (TA1 = (T7:T0), TA2 = (T15:T8)) that indicates a starting byte location within the data
field. With the subsequent read data time slots the master receives data from the DS2423 starting at the
initial address and continuing until the end of a 32-byte page is reached. At that point the bus master will
send 80 additional read data time slots and receive the contents of the 32-bit counter associated with the
addressed page, 32 0-bits and a 16-bit CRC. With subsequent read data time slots the master will receive
data starting at the beginning of the next page followed by the contents of the counter associated with the
page, 0-bits and CRC for that page. This sequence will continue until the final page and its accompanying
data is read by the bus master. When applying the Read Memory + Counter command to a page that does
not have a counter associated, the master will read FFFFFFFFH instead of a valid count.
With the initial pass through the Read Memory + Counter flow chart the 16-bit CRC value is the result of
shifting the command byte into the cleared CRC generator, followed by the two address bytes, the
contents of the data memory, the counter and the 0-bits. Subsequent passes through the Read Memory +
Counter flow chart will generate a 16-bit CRC that is the result of clearing the CRC generator and then
shifting in the contents of the data memory page, its associated counter and 0-bits. After the 16-bit CRC
of the last page is read, the bus master will receive logical 1s from the DS2423 until a Reset Pulse is
issued. The Read Memory + Counter command sequence can be ended at any point by issuing a Reset
Pulse.
Not
Recommended
for
New
Design
相关PDF资料 |
PDF描述 |
|---|---|
| DS2423P | SPECIALTY MEMORY CIRCUIT, PDSO6 |
| DS2423X | SPECIALTY MEMORY CIRCUIT, UUC |
| DS2423 | 4K X 1 STANDARD SRAM, PDSO6 |
| DS2422 | 1K X 1 STANDARD SRAM, PDSO6 |
| DS2430AP | 256 X 1 1-WIRE SERIAL EEPROM, PDSO6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2423V | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Serial SRAM |
| DS2423X | 功能描述:静态随机存取存储器 RoHS:否 制造商:Cypress Semiconductor 存储容量:16 Mbit 组织:1 M x 16 访问时间:55 ns 电源电压-最大:3.6 V 电源电压-最小:2.2 V 最大工作电流:22 uA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:TSOP-48 封装:Tray |
| DS243 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| DS2430 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:256-Bit 1-Wire EEPROM |
| DS2430A | 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
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