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參數資料
| 型號： | ADT7411ARQ |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | SPI/I2C Compatible, 10-Bit Digital Temperature Sensor and 8-Channel ADC |
| 中文描述： | SPI/I2C兼容，10位數字溫度傳感器和8通道ADC |
| 文件頁數： | 28/36頁 |
| 文件大?。?/td> | 456K |
| 代理商： | ADT7411ARQ |
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ADT7411
Serial Interface Selection
The CS line controls the selection between I
2
C and SPI.
Figure 16 shows the selection process necessary to lock the SPI
interface mode.
Rev. A | Page 28 of 36
To communicate to the ADT7411 using the SPI protocol, send
three pulses down the CS line as shown in Figure 33. On the
third rising edge (marked as C in Figure 33), the part selects and
locks the SPI interface. Communication to the device is now
limited to the SPI protocol.
As per most SPI standards, the CS line must be low during
every SPI communication to the ADT7411, and high at all other
times. Typical examples of how to connect the dual interface as
I
2
C or SPI are shown in Figure 31 and Figure 32.
0
ADT7411
CS
SDA
SCL
ADD
V
DD
V
DD
I
2
C ADDRESS = 1001 000
10k
10k
Figure 31. Typical I
2
C Interface Connection
0
ADT7411
SCLK
DOUT
CS
V
DD
LOCK AND
SELECT SPI
SPI FRAMING
EDGE
820
820
820
DIN
Figure 32. Typical SPI Interface Connection
The following sections describe in detail how to use the I
2
C and
SPI protocols associated with the ADT7411.
I
2
C Serial Interface
Like all I
2
C compatible devices, the ADT7411 has a 7-bit serial
address. The four MSBs of this address for the ADT7411 are set
to 1001. The three LSBs are set by Pin 11, ADD. The ADD pin
can be configured three ways to give three different address
options: low, floating, and high. Setting the ADD pin low gives a
serial bus address of 1001 000, leaving it floating gives the
Address 1001 010, and setting it high gives the Address 1001
011. The recommended pull-up resistor value is 10 k.
There is an enable/disable bit for the SMBus timeout. When this
is enabled, the SMBus will timeout after 25 ms of no activity. To
enable it, set Bit 6 of the Control Configuration 2 register. The
power-up default is with the SMBus timeout disabled.
The ADT7411 supports SMBus packet error checking (PEC)
and its use is optional. It is triggered by supplying the extra
clocks for the PEC byte. The PEC is calculated using CRC-8.
The frame clock sequence (FCS) conforms to CRC-8 by the
polynomial
( )
1
1
2
8
+
+
+
=
x
x
x
C
Consult the SMBus specification (www.smbus.org) for more
information.
The serial bus protocol operates as follows:
1.
The master initiates a data transfer by establishing a start
condition, defined as a high-to-low transition on the serial
data line SDA while the serial clock line SCL remains high.
This indicates that an address/data stream will follow. All
slave peripherals connected to the serial bus respond to the
start condition and shift in the next eight bits, consisting of
a 7-bit address (MSB first) plus an R/W bit, which deter-
mines the direction of the data transfer, i.e., whether data
will be written to or read from the slave device.
The peripheral whose address corresponds to the trans-
mitted address responds by pulling the data line low during
the low period before the ninth clock pulse, known as the
acknowledge bit. All other devices on the bus now remain
idle while the selected device waits for data to be read from
or written to it. If the R/W bit is 0, the master will write to
the slave device. If the R/W bit is 1, the master will read
from the slave device.
2.
Data is sent over the serial bus in sequences of nine clock
pulses: eight bits of data followed by an acknowledge bit
from the receiver of data. Transitions on the data line must
occur during the low period of the clock signal and remain
stable during the high period, because a low-to-high trans-
ition when the clock is high may be interpreted as a stop
signal.
3.
When all data bytes have been read or written, stop con-
ditions are established. In write mode, the master will pull
the data line high during the 10th clock pulse to assert a
stop condition. In read mode, the master device will pull
the data line high during the low period before the ninth
clock pulse. This is known as No Acknowledge. The master
will then take the data line low during the low period
before the 10th clock pulse, and then high during the 10th
clock pulse to assert a stop condition.
Any number of bytes of data can be transferred over the
serial bus in one operation, but it is not possible to mix
read and write in one operation. This is because the type of
operation is determined at the beginning and cannot sub-
sequently be changed without starting a new operation.
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相關代理商/技術參數 |
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| ADT7411ARQ-REEL | 功能描述:IC SENSOR TEMP 10BIT ADC 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內部和外部 感應溫度:-55°C ~ 125°C，外部傳感器 精確度:±2°C 本地（最大），±3°C 遠程（最大） 拓撲:ADC（三角積分型），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報:是 輸出風扇:是 電源電壓:2.7 V ~ 5.5 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
| ADT7411ARQ-REEL7 | 功能描述:IC SENSOR TEMP 10BIT ADC 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內部和外部 感應溫度:-55°C ~ 125°C，外部傳感器 精確度:±2°C 本地（最大），±3°C 遠程（最大） 拓撲:ADC（三角積分型），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報:是 輸出風扇:是 電源電壓:2.7 V ~ 5.5 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
| ADT7411ARQZ | 功能描述:IC DGTL TEMP SNSR 8CH ADC 16QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:3,000 系列:- 功能:溫度開關 傳感器類型:內部 感應溫度:85°C 分界點 精確度:±6°C（最小值） 拓撲:ADC（三角積分型），比較器，寄存器庫 輸出類型:開路漏極 輸出警報:是 輸出風扇:是 電源電壓:2.7 V ~ 5.5 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:ADT6501SRJZP085RL7-ND |
| ADT7411ARQZ | 制造商:Analog Devices 功能描述:Temperature Sensor IC |
| ADT7411ARQZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:SPI??-/I2C??-Compatible, 10-Bit Digital Temperature Sensor and 8-Channel ADC |
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