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參數(shù)資料
| 型號： | DS2422 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | DRAM |
| 英文描述： | 1K-Bit 1-Wire RAM with Counters(帶計數(shù)器的1K位1線串行RAM) |
| 中文描述： | 1K X 1 STANDARD SRAM, PDSO6 |
| 封裝： | 3.70 X 4 X 1.50 MM, TSOC-6 |
| 文件頁數(shù)： | 7/23頁 |
| 文件大?。?/td> | 146K |
| 代理商： | DS2422 |
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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2422P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Serial SRAM |
| DS2422S | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| DS2422S+ | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| DS2422X | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| DS2423 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:4kbit 1-Wire RAM with Counter |
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