參數(shù)資料
型號(hào)： ADT7482ARMZ-U2
廠商： ON SEMICONDUCTOR
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 2.5Cel, SQUARE, SURFACE MOUNT
封裝： LEAD FREE, MO-187-BA, MSOP-10
文件頁(yè)數(shù)： 9/24頁(yè)
文件大?。?/td> 335K
代理商： ADT7482ARMZ-U2
ADT7482
Rev. 1 | Page 17 of 24 | www.onsemi.com
SERIAL BUS INTERFACE
Control of the ADT7482 is achieved via the serial bus. The
ADT7482 is connected to this bus as a slave device, under the
control of a master device.
The ADT7482 has an SMBus timeout feature. When this is
enabled, the SMBus times out after typically 25 ms of no
activity. However, this feature is not enabled by default. Set Bit 7
(SCL Timeout Bit) of the consecutive alert register (Address =
0x22) to enable the SCL Timeout. Set Bit 6 (SDA Timeout Bit)
of the consecutive alert register (Address = 0x22) to enable the
SDA Timeout.
Consult the SMBus 1.1 specification for more information.
ADDRESSING THE DEVICE
In general, every SMBus device has a 7-bit device address,
except for some devices that have extended, 10-bit addresses.
When the master device sends a device address over the bus,
the slave device with that address responds. The ADT7482 is
available with one device address, 0x4C (1001 100b). The
address mentioned in this data sheet is a 7-bit address. The
R/W bit needs to be added to arrive at an 8-bit address.
Serial Bus Protocol Operation
The master initiates data transfer by establishing a start
condition, defined as a high-to-low transition on the serial data
line SDATA while the serial clock line SCLK remains high. This
indicates that an address/data stream follows.
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 determines the
direction of the data transfer, that is, whether data is to be
written to or read from the slave device. The peripheral whose
address corresponds to the transmitted 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 a 0, the master
writes to the slave device. If the R/W bit is a 1, the master reads
from the slave device.
Data is sent over the serial bus in a sequence 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, since a low-to-high transition when the clock is
high can 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 then takes the data line low during the low period before
the tenth clock pulse, 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 case of the ADT7482, write
operations contain either one or two bytes, while read
operations contain one byte.
To write data to one of the device data registers or to read data
from it, the address pointer register must be set so that the
correct data register is addressed. The first byte of a write
operation always contains a valid address that is stored in the
address pointer register. If data is to be written to the device, the
write operation contains a second data byte that is written to the
register selected by the address pointer register.
The device address is sent over the bus followed by R/W 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.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADT7483A 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Channel Temperature Sensor and Over Temperature Alarm
ADT7483AARQZ 功能描述:板上安裝溫度傳感器 2 TEMP DIODE MONITOR 2 WIRE SMBUS INTRFCE RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
ADT7483AARQZ-R7 功能描述:板上安裝溫度傳感器 2 TEMP DIODE MONITOR 2 WIRE SMBUS INTRFCE RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
ADT7483AARQZ-REEL 功能描述:IC TEMP SENSOR/ALARM 3CH 16-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)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(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫(kù) 輸出類型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 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(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6
ADT7483AARQZ-REEL7 功能描述:IC TEMP SENSOR/ALARM 3CH 16-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)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(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫(kù) 輸出類型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 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(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6
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