- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385273 > DS2450 (Maxim Integrated Products, Inc.) 1-Wire Quad A/D Converter(1線串行四路A/D轉(zhuǎn)換器) PDF資料下載
參數(shù)資料
| 型號： | DS2450 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 1-Wire Quad A/D Converter(1線串行四路A/D轉(zhuǎn)換器) |
| 中文描述： | 四路、1-Wire A/D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 3/23頁 |
| 文件大小： | 165K |
| 代理商： | DS2450 |
DS2450
091598 3/23
HIERARCHICAL STRUCTURE FOR 1–WIRE PROTOCOL
Figure 2
1–WIRE ROM FUNCTION
COMMANDS (SEE FIGURE 9)
DS2450 SPECIFIC
FUNCTION COMMANDS
(SEE FIGURE 6)
COMMAND
LEVEL:
AVAILABLE
COMMANDS:
ELEMENT
AFFECTED:
READ ROM
MATCH ROM
SEARCH ROM
SKIP ROM
OVERDRIVE MATCH ROM
OVERDRIVE SKIP ROM
CONDITIONAL
SEARCH ROM
64–BIT ROM
64–BIT ROM
64–BIT ROM
N/A
64–BIT ROM
N/A
64–BIT ROM,
CONVERSION
RESULTS
ALL REGISTER
CONTROL REGISTERS
SELECTED INPUTS
READ MEMORY
WRITE MEMORY
CONVERT
BUS
MASTER
1–WIRE BUS
OTHER
DEVICES
DS2450
The DS2450 uses the standard Dallas Semiconductor
1–Wire protocol for data transfers. Communication to
and from the DS2450 requires a single bi–directional
line that is typically a port pin of a microcontroller. The
hierarchical structure of the 1–Wire protocol is shown in
Figure 2. The 1–Wire bus master must first provide one
of the seven ROM Function Commands, 1) Read ROM,
2) Match ROM, 3) Search ROM, 4) Conditional Search
ROM, 5) Skip ROM, 6) Overdrive–Skip ROM or 7) Over-
drive–Match ROM. Upon completion of an overdrive
ROM command byte executed at standard speed, the
device will enter Overdrive mode where all subsequent
communication occurs at a higher speed. The protocol
required for these ROM function commands is
described in Figure 9. After a ROM function command is
successfully executed, the memory and control func-
tions become accessible and the master may provide
any one of the available commands. The protocol for
these commands is described in Figure 6. All data is
read and written least significant bit first.
64–BIT LASERED ROM
Each DS2450 contains a unique ROM code that is 64
bits long. The first eight bits are a 1–Wire family code.
The next 48 bits are a unique serial number. The last
eight bits are a CRC of the first 56 bits. (See Figure 3.)
The 1–Wire CRC is generated using a polynomial gen-
erator consisting of a shift register and XOR gates as
shown in Figure 4. The polynomial is X
8
+ X
5
+ X
4
+ 1.
Additional information about the Dallas 1–Wire Cyclic
Redundancy Check is available in the Book of DS19xx
iButton
TM
Standards. The shift register acting as the
CRC accumulator is initialized to zero. Then starting
with the least significant bit of the family code, one bit at
a time is shifted in. After the 8th bit of the family code has
been entered, then the serial number is entered. After
the 48th bit of the serial number has been entered, the
shift register contains the CRC value. Shifting in the
eight bits of CRC should return the shift register to all
zeros.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS2480 | Serial 1-Wire Line Driver(1線串行線驅(qū)動器) |
| DS2505-UNW | UniqueWare Add-only Memory(專用只加存儲器) |
| DS2506-UNW | UniqueWare Add-only Memory(專用只加存儲器) |
| DS2506 | 64K bit Add-Only Memory(64K位只加存儲器) |
| DS26303 | 3.3V, E1/T1/J1, Short-Haul, Octal Line Interface Unit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2450S | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| DS2450S/T&R | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| DS2450S+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Quad 1-Wire RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| DS2450S+ | 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR ((NW)) |
| DS2450S+T&R | 制造商:Maxim Integrated Products 功能描述:IC CONVERTER A/D QUAD 1-W 8-SOIC |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。