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参数资料
| 型号： | DS2422X |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Memory IC:Other |
| 英文描述： | SPECIALTY MEMORY CIRCUIT, UUC |
| 文件页数： | 21/23页 |
| 文件大小： | 146K |
| 代理商： | DS2422X |
DS2422/DS2423
021998 7/23
ADDRESS REGISTERS Figure 6
TARGET ADDRESS (TA1)
TARGET ADDRESS (TA2)
ENDING ADDRESS WITH
DATA STATUS (E/S)
(READ ONLY)
T7
T6
T5
T4
T3
T2
T1
T0
T15
T14
T13
T12
T11
T10
T9
T8
AA
1)
PF
E4
E3
E2
E1
E0
1) THIS BIT WILL ALWAYS BE 0.
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 unaf-
fected.
The hardware of the DS242X 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 recom-
mended to packetize data into data packets of the size
of one memory page each. Such a packet would typi-
cally store a 16–bit CRC with each page of data to insure
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 the Book of DS19xx iButton
Standards, Chapter 7 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 DS242X as the end of a
memory page is encountered. Following the current
value of the counter the DS242X transmits 32 zero bits
and a 16–bit CRC generated by the DS242X.
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 DS242X 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 zero 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 con-
tents of the counter associated with the page, zero 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 gener-
ator, followed by the two address bytes, the contents of
the data memory, the counter and the zero bits. Subse-
quent 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 con-
tents of the data memory page, its associated counter
and zero bits. After the 16–bit CRC of the last page is
read, the bus master will receive logical 1s from the
DS242X until a Reset Pulse is issued.
The Read
Memory + Counter command sequence can be ended
at any point by issuing a Reset Pulse.
相关PDF资料 |
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| DS2423P/T&R | SPECIALTY MEMORY CIRCUIT, PDSO6 |
| DS2423P | SPECIALTY MEMORY CIRCUIT, PDSO6 |
| DS2423X | SPECIALTY MEMORY CIRCUIT, UUC |
| DS2423 | 4K X 1 STANDARD SRAM, PDSO6 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2423 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:4kbit 1-Wire RAM with Counter |
| DS2423D/T&R | 制造商:Maxim Integrated Products 功能描述:IC SRAM 4KBIT 6FLIPCHIP |
| DS2423D/T&R | 功能描述:IC SRAM 4KBIT 6FCHIP RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:150 系列:- 格式 - 存储器:EEPROMs - 串行 存储器类型:EEPROM 存储容量:4K (2 x 256 x 8) 速度:400kHz 接口:I²C，2 线串口 电源电压:2.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-DFN（2x3） 包装:管件 产品目录页面:1445 (CN2011-ZH PDF) |
| DS2423MRAB0 | 制造商:Thomas & Betts 功能描述:300A,NLT,3P4W,MG,423,3P480V |
| DS2423P | 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 |
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