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| 型号： | ADT7473ARQZ-1REEL |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封装： | ROHS COMPLIANT, MO-137AB, QSOP-16 |
| 文件页数： | 3/72页 |
| 文件大小： | 1494K |
| 代理商： | ADT7473ARQZ-1REEL |
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ADT7473/ADT7473-1
Rev. C | Page 11 of 72
046
86
-0
86
DO NOT LEAVE ADDREN
UNCONNECTED! CAN
CAUSE UNPREDICTABLE
ADDRESSES.
ADT7473-1
4
8
NC
VCC
10k
CARE SHOULD BE TAKEN TO ENSURE THAT PIN 8
(PWM3/ADDREN) IS EITHER TIED HIGH OR LOW. LEAVING PIN 8
FLOATING COULD CAUSE THE ADT7473-1 TO POWER UP WITH
AN UNEXPECTED ADDRESS.
NOTE THAT IF THE ADT7473-1 IS PLACED INTO ADDR SELECT
MODE, PINS 8 AND 4 CANNOT BE USED AS THE ALTERNATIVE
FUNCTIONS (PWM3, TACH4/THERM) UNLESS THE CORRECT
CIRCUIT IS MUXED IN AT THE CORRECT TIME OR DESIGNED TO
HANDLE THESE DUAL FUNCTIONS.
ADDR SELECT
PWM3/ADDREN
Figure 18. Unpredictable SMBus Address if Pin 8 is Unconnected
The ability to make hardwired changes to the SMBus slave
address allows the user to avoid conflicts with other devices
sharing the same serial bus, for example, if more than one
ADT7473-1 is used in a system.
Data is sent over the serial bus in sequences of nine clock
pulses: eight bits of data followed by an acknowledge bit from
the slave device. 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 transition when the clock is
high might be interpreted as a stop signal. The number of data
bytes that can be transmitted over the serial bus in a single read
or write operation is limited only by what the master and slave
devices can handle.
When all data bytes have been read or written, stop conditions
are established. In write mode, the master pulls the data line
high during the tenth clock pulse to assert a stop condition. In
read mode, the master device overrides the acknowledge bit by
pulling the data line high during the low period before the
ninth clock pulse; this is known as No Acknowledge. The
master takes the data line low during the low period before the
tenth clock pulse, and then high during the tenth 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, because the type of operation is determined at
the beginning and cannot subsequently be changed without
starting a new operation.
In the ADT7473/ADT7473-1, write operations contain either
one or two bytes, and read operations contain one byte. To write
data to one of the device data registers or read data from it, the
address pointer register must be set so the correct data register
is addressed, and then data can be written into that register or
read from it. The first byte of a write operation always contains
an address that is stored in the address pointer register. If data is
written to the device, the write operation contains a second data
byte that is written to the register selected by the address
pointer register.
This write operation is shown in Figure 19. The device address
is sent over the bus, and then R/W is set to 0. This is followed
by two data bytes. The first data byte is the address of the
internal data register to be written to, which is stored in the
address pointer register. The second data byte is the data to be
written to the internal data register.
When reading data from a register, there are two possibilities:
If the ADT7473/ADT7473-1’s address pointer register
value is unknown or not the desired value, it must first be
set to the correct value before data can be read from the
desired data register. This is done by performing a write to
the ADT7473/ADT7473-1, but only the data byte contain-
ing the register address is sent, because no data is written
to the register. This is shown in Figure 20.
A read operation is then performed consisting of the serial
bus address, R/W bit set to 1, followed by the data byte
read from the data register. This is shown in Figure 21.
If the address pointer register is known to be already at the
desired address, data can be read from the corresponding
data register without first writing to the address pointer
register, as shown in Figure 21.
R/W
0
SCL
SDA
10
1
0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADT7473/ADT7473-1
START BY
MASTER
19
1
ACK. BY
ADT7473/ADT7473-1
9
D7
D6
D5
D4
D3
D2
D1
D0
STOP BY
MASTER
1
9
SCL (CONTINUED)
SDA (CONTINUED)
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
FRAME 3
DATA BYTE
0
46
86
-0
16
ACK. BY
ADT7473/ADT7473-1
Figure 19. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7473ARQZ-1REEL7 | 功能描述:IC THERM MON FAN CTRLR 16-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:dBCool® 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADT7473ARQZ-1RL | 功能描述:板上安装温度传感器 FAN CNTRLR/INT MON RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| ADT7473ARQZ-REEL | 功能描述:板上安装温度传感器 FAN CNTRLR/INT MON RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| ADT7473ARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 16QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:dBCool® 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADT7473ARQZ-RL7 | 功能描述:板上安装温度传感器 FAN CNTRLR/INT MON RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
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