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)： 17/23頁
文件大小： 165K
代理商： DS2450
DS2450
091598 17/23
USAGE EXAMPLE
(control channel A and channel B outputs)
MASTER MODE
DATA (LSB FIRST)
COMMENTS
TX
Reset
Reset Pulse (480 – 960
μ
s)
RX
Presence
Presence Pulse
TX
CCh
Issue “Skip ROM” Command
TX
55h
Issue “Write Memory” Command
TX
08h
TA1, beginning address
TX
00h
TA2, address = 0008h
TX
80h if AFL = 1 / C0h if AFL = 0
data byte (address 0008)
CH–A
RX
<CRC16>
CRC of command, address, data byte
RX
<data byte>
read–back for simple verification
TX
00h
next data byte (address 0009h)*
RX
<CRC16>
CRC of address, data byte
RX
00h
read–back for simple verification
TX
80h if AFH = 1 / C0h if AFH = 0
data byte (address 000A)
CH–B
RX
<CRC16>
CRC of address, data byte
RX
<data byte>
read–back for simple verification
TX
Reset
Reset Pulse (480 – 960
μ
s)
RX
Presence
Presence Pulse
* In a multi–drop environment it takes less time to perform a non–changing write cycle rather than skipping a byte.
1–WIRE SIGNALING
The DS2450 requires strict protocols to insure data
integrity. The protocol consists of four types of signaling
on one line: reset sequence with reset pulse and pres-
ence pulse, Write 0, Write 1 and Read Data. All these
signals except presence pulse are initiated by the bus
master. The DS2450 can communicate at two different
speeds, regular speed and Overdrive Speed. If not
explicitly set into the Overdrive mode, the DS2450 will
communicate at regular speed. While in Overdrive
mode the fast timing applies to all wave forms.
The initialization sequence required to begin any com-
munication with the DS2450 is shown in Figure 10. A
Reset Pulse followed by a Presence Pulse indicates the
DS2450 is ready to send or receive data given the cor-
rect ROM command and memory function command.
The bus master transmits (TX) a reset pulse (t
RSTL
,
minimum 480
μ
s at regular speed, 48
μ
s at Overdrive
Speed). The bus master then releases the line and goes
into receive mode (RX). The 1–Wire bus is pulled to a
high state via the pull–up resistor. After detecting the ris-
ing edge on the data pin, the DS2450 waits (t
PDH
,15–60
μ
s at regular speed, 2–6
μ
s at Overdrive speed) and
then transmits the Presence Pulse (t
PDL
, 60–240
μ
s at
regular speed, 8–24
μ
s at Overdrive Speed).
A Reset Pulse of 480
μ
s or longer will exit the Overdrive
Mode returning the device to regular speed. If the
DS2450 is in Overdrive Mode and the Reset Pulse is no
longer than 80
μ
s the device will remain in Overdrive
Mode.
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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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