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參數(shù)資料
| 型號(hào)： | 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(jì)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)： | 3/23頁 |
| 文件大?。?/td> | 146K |
| 代理商： | DS2422 |
DS2422/DS2423
021998 3/23
DS242X BLOCK DIAGRAM
Figure 1
64-BIT
LASERED
ROM
1–WIRE
FUNCTION
CONTROL
MEMORY
FUNCTION
CONTROL
256–BIT
SCRATCHPAD
SRAM
4096–BIT
(DS2423)
1024–BIT
(DS2422)
(256–BIT PAGES)
DATA
1–WIRE BUS
PARASITE–POWERED
CIRCUITRY
PAGE
WRITE CYCLE
COUNTERS
EXTERNALLY
TRIGGERED
COUNTERS
RPI
V
bat
INPUT A
INPUT B
MEMORY
The memory map in Figure 5 shows a 32–byte page
called the scratchpad and additional 32–byte pages
called memory. The DS2422 contains pages 0 through
3 which make up the 1024–bit SRAM. The DS2423 con-
tains pages 0 through 15 which make up the 4096–bit
SRAM. The scratchpad is an additional page that acts
as a buffer when writing to memory.
ADDRESS REGISTERS AND TRANSFER
STATUS
Because of the serial data transfer, the DS242X
employs three address registers, called TA1, TA2 and
E/S (Figure 6). Registers TA1 and TA2 must be loaded
with the target address to which the data will be written
or from which data will be sent to the master upon a
Read command. Register E/S acts like a byte counter
and Transfer Status register. It is used to verify data
integrity with write commands. Therefore, the master
only has read access to this register. The lower five bits
of the E/S register indicate the address of the last byte
that has been written to the scratchpad. This address is
called Ending Offset. Bit 5 of the E/S register, called PF
or “partial byte flag,” is set if the number of data bits sent
by the master is not an integer multiple of 8. Bit 6 has no
function; it always reads 0. Note that the lowest five bits
of the target address also determine the address within
the scratchpad, where intermediate storage of data will
begin. This address is called byte offset. If the target
address (TA1) for a Write command is 03CH for exam-
ple, then the scratchpad will store incoming data begin-
ning at the byte offset 1CH and will be full after only four
bytes. The corresponding ending offset in this example
is 1FH. For best economy of speed and efficiency, the
target address for writing should point to the beginning
of a new page, i.e., the byte offset will be 0. Thus the full
32–byte capacity of the scratchpad is available, result-
ing also in the ending offset of 1FH. However, it is pos-
sible to write one or several contiguous bytes some-
where within a page. The ending offset together with the
Partial Flag support the master checking the data integ-
rity after a Write command. The highest valued bit of the
E/S register, called AA or Authorization Accepted, acts
as a flag to indicate that the data stored in the scratch-
pad has already been copied to the target memory
address. Writing data to the scratchpad clears this flag.
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| DS2505-UNW | UniqueWare Add-only Memory(專用只加存儲(chǔ)器) |
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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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