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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)： | 7/23頁 |
| 文件大小： | 165K |
| 代理商： | DS2450 |
DS2450
091598 7/23
WRITE MEMORY [55H]
The Write Memory command is used to write to memory
pages 1 and 2 in order to set the channel–specific con-
trol data and alarm thresholds. The bus master will fol-
low the command byte with a two byte starting address
(TA1=(T7:T0), TA2=(T15:T8)) and a data byte of
(D7:D0). A 16–bit CRC of the command byte, address
bytes, and data byte is computed by the DS2450 and
read back by the bus master to confirm that the correct
command word, starting address, and data byte were
received. Now the DS2450 copies the data byte to the
specified memory location. With the next eight time slots
the bus master receives a copy of the same byte but
read from memory for verification. If the verification fails,
a Reset Pulse should be issued and the current byte
address should be written again.
If the bus master does not issue a Reset Pulse and the
end of memory was not yet reached, the DS2450 will
automatically increment its address counter to address
the next memory location. The new two–byte address
will also be loaded into the 16–bit CRC–generator as a
starting value. The bus master will send the next byte
using eight write time slots. As the DS2450 receives this
byte it also shifts it into the CRC–generator and the
result is a 16–bit CRC of the new data byte and the new
address. With the next sixteen read time slots the bus
master will read this 16–bit CRC from the DS2450 to
verify that the address incremented properly and the
data byte was received correctly. If the CRC is incorrect,
a Reset Pulse should be issued in order to repeat the
Write Memory command sequence.
Note that the initial pass through the Write Memory flow
chart will generate a 16–bit CRC value that is the result
of shifting the command byte into the CRC–generator,
followed by the two address bytes, and finally the data
byte. Subsequent passes through the Write Memory
flow chart due to the DS2450 automatically increment-
ing its address counter will generate a 16–bit CRC that
is the result of loading (not shifting) the new (increm-
ented) address into the CRC–generator and then shift-
ing in the new data byte.
The decision to continue after having received a bad
CRC or if the verification fails is made entirely by the bus
master. Write access to the conversion read–out regis-
ters is not possible. If a write attempt is made to a page 0
address the device will follow the Write Memory flow
chart correctly but the verification of the data byte read
back from memory will usually fail. The Write Memory
command sequence can be ended at any point by issu-
ing a Reset Pulse.
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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 |
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