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參數(shù)資料
| 型號： | ADT7476AARQZ-R |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 11/66頁 |
| 文件大?。?/td> | 945K |
| 描述： | IC REMOTE THERMAL CTLR 24QSOP |
| 產(chǎn)品變化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 |
| 標準包裝： | 2,500 |
| 系列： | dBCool® |
| 功能： | 風扇控制，溫度監(jiān)控器 |
| 傳感器類型： | 內部和外部 |
| 感應溫度： | -40°C ~ 125°C |
| 精確度： | ±2.5% |
| 拓撲： | ADC，比較器，風扇速度計數(shù)器，多路復用器，寄存器庫 |
| 輸出類型： | SMBus? |
| 輸出警報： | 無 |
| 輸出風扇： | 是 |
| 電源電壓： | 3 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SSOP（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 24-QSOP |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | ADT7476AARQZ-R-ND ADT7476AARQZ-ROSTR |
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ADT7476A
http://onsemi.com
11
Figure 20. Reading Data from a Previously Selected Register
0
SCL
SDA
1
0
1
1
A1 A0
D7
D6
D5 D4 D3 D2 D1 D0
NO ACK. BY
MASTER
STOP BY
MASTER
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
DATA BYTE FROM ADT7476A
1
1
9
ACK. BY
ADT7476A
9
R/W
Write Operations
The SMBus specification defines several protocols for
different types of read and write operations. The ones used
in the ADT7476A are discussed below. The following
abbreviations are used in the diagrams:
?SPAN class="pst ADT7476AARQZ-R_2298076_4"> S START
?SPAN class="pst ADT7476AARQZ-R_2298076_4"> P STOP
?SPAN class="pst ADT7476AARQZ-R_2298076_4"> R READ
?SPAN class="pst ADT7476AARQZ-R_2298076_4"> W
WRITE
?SPAN class="pst ADT7476AARQZ-R_2298076_4"> A ACKNOWLEDGE
?SPAN class="pst ADT7476AARQZ-R_2298076_4"> A
NO ACKNOWLEDGE
The ADT7476A uses the following SMBus write protocols.
Send Byte
In this operation, the master device sends a single
command byte to a slave device, as follows:
1. The master device asserts a start condition on SDA.
2. The master sends the 7-bit slave address followed
by the write bit (low).
3. The addressed slave device asserts ACK on SDA.
4. The master sends a command code.
5. The slave asserts ACK on SDA.
6. The master asserts a stop condition on SDA, and
the transaction ends.
For the ADT7476A, the send byte protocol is used to write
a register address to RAM for a subsequent single-byte read
from the same address. This operation is illustrated in
Figure 21.
Figure 21. Setting a Register Address for
Subsequent Read
SLAVE
ADDRESS
W A
S
A P
REGISTER
ADDRESS
2
3
1
5 6
4
If the master is required to read data from the register
immediately after setting up the address, it can assert a repeat
start condition immediately after the final ACK and carry
out a single byte read without asserting an intermediate stop
condition.
Write Byte
In this operation, the master device sends a command byte
and one data byte to the slave device, as follows:
1. The master device asserts a start condition on SDA.
2. The master sends the 7-bit slave address followed
by the write bit (low).
3. The addressed slave device asserts ACK on SDA.
4. The master sends a command code.
5. The slave asserts ACK on SDA.
6. The master sends a data byte.
7. The slave asserts ACK on SDA.
8. The master asserts a stop condition on SDA,
and the transaction ends.
This operation is illustrated in Figure 22.
Figure 22. Single-byte Write to a Register
SLAVE
ADDRESS
W A
DATA
S
A
A P
REGISTER
ADDRESS
2
3
1
5
6
7 8
4
Read Operations
The ADT7476A uses the following SMBus read
protocols.
Receive Byte
This operation is useful when repeatedly reading a single
register. The register address is set up beforehand. In this
operation, the master device receives a single byte from a
slave device, as follows:
1. The master device asserts a start condition on SDA.
2. The master sends the 7-bit slave address followed
by the read bit (high).
3. The addressed slave device asserts ACK on SDA.
4. The master receives a data byte.
5. The master asserts NO ACK on SDA.
6. The master asserts a stop condition on SDA, and
the transaction ends.
In the ADT7476A, the receive byte protocol is used to
read a single byte of data from a register whose address has
previously been set by a send byte or write byte operation.
This operation is illustrated in Figure 23.
Figure 23. Single-byte Read from a Register
SLAVE
ADDRESS
DATA
A
R
S
A P
2
4
3
1
5 6
Alert Response Address
Alert response address (ARA) is a feature of SMBus
devices, allowing an interrupting device to identify itself to
the host when multiple devices exist on the same bus.
The SMBALERT
output can be used as either an interrupt
output or an SMBALERT
. One or more outputs can be
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| ADT7476AARQZ-REEL | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 標準包裝:1 系列:- 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:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
| ADT7476AARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 標準包裝:1 系列:- 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:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
| ADT7476AARQZ-RL7 | 功能描述:板上安裝溫度傳感器 MONITORS 5V/4 FANS RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| ADT7476ARQH | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:dBCOOL Remote Thermal Controller and Voltage Monitor |
| ADT7476ARQH-REEL | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:dBCOOL Remote Thermal Controller and Voltage Monitor |
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