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參數(shù)資料
| 型號： | ADT7482ARMZ-RL |
| 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 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大小： | 335K |
| 代理商： | ADT7482ARMZ-RL |
ADT7482
Rev. 1 | Page 19 of 24 | www.onsemi.com
ALERT OUTPUT
Pin 8 can be configured as an ALERT output. The ALERT
output goes low whenever an out-of-limit measurement is
detected, or if the remote temperature sensor is an open circuit.
It is an open-drain output and requires a pull-up to VDD. Several
ALERT outputs can be wire-OR’ed together, so that the common
line goes low if one or more of the ALERT outputs goes low.
The ALERT output can be used as an interrupt signal to a
processor, or it can be used as an SMBALERT. Slave devices on
the SMBus cannot normally signal to the bus master that they
want to talk, but the SMBALERT function allows them to do so.
One or more ALERT outputs can be connected to a common
SMBALERT line connected to the master. When the SMBALERT
line is pulled low by one of the devices, the following procedure
occurs as illustrated in Figure 20.
ALERT RESPONSE
ADDRESS
MASTER SENDS
ARA AND READ
COMMAND
DEVICE SENDS
ITS ADDRESS
RD
START
ACK
DEVICE
ADDRESS
NO
ACK STOP
MASTER
RECEIVES
SMBALERT
06150
-0
20
Figure 20. Use of SMBALERT
1.
SMBALERT is pulled low.
2.
Master initiates a read operation and sends the alert
response address (ARA = 0001 100). This is a general call
address that should not be used as a specific device
address.
3.
The device whose ALERT output is low responds to the
alert response address and the master reads its device
address. As the device address is seven bits, an LSB of 1 is
added. The address of the device is now known and it can
be interrogated in the usual way.
4.
If more than one device has a low ALERT, the one with the
lowest device address has priority, in accordance with
normal SMBus arbitration.
5.
Once the ADT7482 has responded to the alert response
address, it resets its ALERT output, provided that the error
condition that caused the ALERT no longer exists. If the
SMBALERT line remains low, the master sends the ARA
again, and so on until all devices with low ALERT
outputs respond.
LOW POWER STANDBY MODE
The ADT7482 can be put into low power standby mode by
setting Bit 6 (Mon/STBY bit) of the Configuration 1 register
(Read Address = 0x03, Write Address = 0x09) to 1. When Bit 6
is 0, the ADT7482 operates normally. When Bit 6 is 1, the ADC
is inhibited, and any conversion in progress is terminated
without writing the result to the corresponding value register.
The SMBus is still enabled in low power standby mode. Power
consumption in this standby mode is reduced to a typical of
5 μA if there is no SMBus activity or up to 30 μA if there are
clock and data signals on the bus.
When the device is in standby mode, it is still possible to initiate
a one-shot conversion of all channels by writing to the one-shot
register (Address 0x0F), after which the device returns to
standby. It does not matter what is written to the one-shot
register as all data written to it is ignored. It is also possible to
write new values to the limit register while in standby mode. If
the values stored in the temperature value registers are now
outside the new limits, an ALERT is generated, even though the
ADT7482 is still in standby mode.
SENSOR FAULT DETECTION
The ADT7482 has sensor fault detection circuitry internally at
its D+ inputs. This circuit can detect situations where a remote
diode is not connected, or is incorrectly connected, to the
ADT7482. A simple voltage comparator trips if the voltage at
D+ exceeds VDD 1 V (typical), signifying an open circuit
between D+ and D. The output of this comparator is checked
when a conversion is initiated. Bit 2 (D1 OPEN flag) of the
StatusRegister 1 (Address 0x02) is set if a fault is detected on the
Remote 1 channel. Bit 2 (D2 OPEN flag) of the Status Register 2
(Address 0x23) is set if a fault is detected on the Remote 2
channel. If the ALERT pin is enabled, setting this flag causes
ALERT to assert low.
If a remote sensor is not used with the ADT7482, then the D+
and D inputs of the ADT7482 need to be tied together to
prevent the OPEN flag from being set continuously.
Most temperature sensing diodes have an operating temperature
range of 55°C to +150°C. Above 150°C, they lose their
semiconductor characteristics and approximate conductors
instead. This results in a diode short, setting the open flag. The
remote diode in this case no longer gives an accurate temperature
measurement. A read of the temperature result register gives the
last good temperature measurement. Be aware that while the
diode fault is triggered, the temperature measurement on the
remote channels may not be accurate.
INTERRUPT SYSTEM
The ADT7482 has two interrupt outputs, ALERT and THERM.
Both have different functions and behavior. ALERT is maskable
and responds to violations of software-programmed
temperature limits or an open-circuit fault on the remote diode.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADT7482ARMZ-RL7 | 功能描述:板上安裝溫度傳感器 2 CH TEMP SNSR/ALARM 2 WIRE SMBUS INTRFCE 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(guān)閉: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| 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(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(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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