- 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)： | 12/23頁 |
| 文件大小： | 165K |
| 代理商： | DS2450 |
DS2450
091598 12/23
Match ROM [55H]
The match ROM command, followed by a 64–bit ROM
sequence, allows the bus master to address a specific
DS2450 on a multidrop bus. Only the DS2450 that
exactly matches the 64–bit ROM sequence will respond
to the following memory/convert function command. All
slaves that do not match the 64–bit ROM sequence will
wait for a reset pulse. This command can be used with a
single or multiple devices on the bus.
Skip ROM [CCH]
This command can save time in a single drop bus sys-
tem by allowing the bus master to access the memory/
convert functions without providing the 64–bit ROM
code. If more than one slave is present on the bus and a
read command is issued following the Skip ROM com-
mand, data collision will occur on the bus as multiple
slaves transmit simultaneously (open drain pull–downs
will produce a wired–AND result).
Search ROM [F0H]
When a system is initially brought up, the bus master
might not know the number of devices on the 1–Wire
bus or their 64–bit ROM codes. The Search ROM com-
mand allows the bus master to use a process of elimina-
tion to identify the 64–bit ROM codes of all slave devices
on the bus. The search ROM process is the repetition of
a simple 3–step routine: read a bit, read the complement
of the bit, then write the desired value of that bit. The bus
master performs this simple, 3–step routine on each bit
of the ROM. After one complete pass, the bus master
knows the contents of the ROM in one device. The
remaining number of devices and their ROM codes may
be identified by additional passes. See Chapter 5 of the
Book of DS19xx iButton Standards for a comprehensive
discussion of a Search ROM, including an actual
example.
Conditional Search [ECH]
The Conditional Search ROM command operates simi-
larly to the Search ROM command except that only
devices fulfilling the specified condition will participate in
the search. The DS2450 will respond to the Conditional
Search command if a channel’s alarm enable flags AEH
and/or AEL are set and the conversion results in a value
outside the range specified by the channel’s alarm
threshold voltages. See section Device Registers for
details. The Conditional Search ROM provides an effi-
cient means for the bus master to determine devices on
a multidrop system that have to signal an important
event, such as a voltage leaving the tolerance band.
After each pass of the Conditional Search that success-
fully determined the 64–bit ROM for a specific device on
the multidrop bus, that particular device can be individu-
ally accessed as if a Match ROM had been issued since
all other devices will have dropped out of the search pro-
cess and are waiting for a reset pulse.
Overdrive Skip ROM [3CH]
On a single–drop bus this command can save time by
allowing the bus master to access the memory/convert
functions without providing the 64–bit ROM code.
Unlike the normal Skip ROM command the Overdrive
Skip ROM sets the DS2450 in the Overdrive Mode (OD
= 1). All communication following this command has to
occur at Overdrive Speed until a reset pulse of minimum
480
μ
s duration resets all devices on the bus to regular
speed (OD = 0).
When issued on a multidrop bus this command will set
all Overdrive–supporting devices into Overdrive mode.
To subsequently address a specific Overdrive–support-
ing device, a reset pulse at Overdrive speed has to be
issued followed by a Match ROM or Search ROM com-
mand sequence. This will speed up the time for the
search process. If more than one slave supporting
Overdrive is present on the bus and the Overdrive Skip
ROM command is followed by a read command, data
collision will occur on the bus as multiple slaves transmit
simultaneously (open drain pull–downs will produce a
wired–AND result).
Overdrive Match ROM [69H]
The Overdrive Match ROM command, followed by a
64–bit ROM sequence transmitted at Overdrive Speed,
allows the bus master to address a specific DS2450 on
a multidrop bus and to simultaneously set it in Overdrive
Mode. Only the DS2450 that exactly matches the 64–bit
ROM sequence will respond to the subsequent memory
function command. Slaves already in Overdrive mode
from a previous Overdrive Skip or Match command will
remain in Overdrive mode. All overdrive–capable
slaves will return to regular speed at the next Reset
Pulse of minimum 480
μ
s duration. The Overdrive
Match ROM command can be used with a single or mul-
tiple devices on the bus.
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)。