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參數(shù)資料
| 型號： | ADM1031ARQZ-R7 |
| 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), 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | LEAD FREE, QSOP-16 |
| 文件頁數(shù)： | 15/30頁 |
| 文件大?。?/td> | 299K |
| 代理商： | ADM1031ARQZ-R7 |
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ADM1031
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Figure 37. Fan Speed Measurement
CLOCK
CONFIG 2
REG. BIT 2
FAN
INPUT
START OF
MONITORING
CYCLE
FAN
MEASUREMENT
PERIOD
In situations where different output drive circuits are used
for fan drive, it can be desirable to invert the PWM drive
signal. Setting Bit 3 of Configuration Register 1 (0
×00) to 1,
inverts the PWM_OUT signal. This makes the PWM_OUT
pin high for 100% duty cycle. Bit 3 of Configuration
Register 1 should generally be set to 1 when using an
nMOS device to drive the fan.
If using a pMOS device, Bit 3 of Configuration Register
1 should be cleared to 0.
FAN_FAULTs
The FAN_FAULT output (Pin 8) is an activelow,
opendrain output used to signal fan failure to the system
processor. Writing a Logic 1 to Bit 4 of Configuration
Register 1 (0
×00) enables the FAN_FAULT output pin. The
FAN_FAULT output is enabled by default. The
FAN_FAULT output asserts low only when five consecutive
interrupts are generated by the ADM1031 device due to the
fan running underspeed, or if the fan is completely stalled.
Note that the Fan Tach High Limit must be exceeded by at
least one before a FAN_FAULT can be generated. For
example, if we are only interested in getting a FAN_FAULT
if the fan stalls, then the fan speed value is 0
×FF for a failed
fan. Therefore, we should make the Fan Tach High
Limit = 0
×FE to allow FAN_FAULT to be asserted after five
consecutive fan tach failures.
Figure 38 shows the relationship between INT,
FAN_FAULT, and the PWM drive channel. The
PWM_OUT channel is driving a fan at some PWM duty
cycle, 50% for example, and the fan’s tach signal (or fan
current for a 2wire fan) is being monitored at the
TACH/AIN pin. Tach pulses are being generated by the fan,
during the high time of the PWM duty cycle train. The tach
is pulled high during the off time of the PWM train because
the fan is connected highside to the nMOS device.
Suppose the fan has twice previously failed its fan speed
measurement. Looking at Figure 38, PWM_OUT is brought
high for two seconds, to restart the fan if it has stalled.
Sometime later a third tach failure occurs. This is evident by
the tach signal being low during the high time of the PWM
pulse, causing the fan speed reading register to reach its
maximum count of 255. Since the tach limit has been
exceeded, an interrupt is generated on the INT pin. The fan
fault bit (Bit 1) of Interrupt Status Register 1 (Register 0
×02)
is also asserted. Once the processor has acknowledged the
INT by reading the status register, the INT is cleared.
PWM_OUT is then brought high for another two seconds to
restart the fan. Subsequent fan failures cause INT to be
reasserted and the PWM_OUT signal is brought high for
two seconds (fan spinup default) each time to restart the
fan. Once the fifth tach failure occurs, the failure is deemed
to be catastrophic and the FAN_FAULT pin is asserted low.
PWM_OUT is brought high to attempt to restart the fan. The
INT pin continues to generate interrupts after the assertion
of FAN_FAULT since tach measurement continues even
after fan failure. Should the fan recover from its failure
condition, the FAN_FAULT signal is negated, and the fan
returns to its normal operating speed.
Figure 39 shows a typical application circuit for the
ADM1031. Temperature monitoring can be based around a
CPU diode or discrete transistor measuring thermal
hotspots. Either 2 or 3wire fans can be monitored by the
ADM1031, as shown.
Figure 38. Operation of FAN_FAULT and Interrupt Pins
PWM_OUT
TACH/AIN
INT
FAN_FAULT
STATUS REG READ TO
CLEAR INTERRUPT
FULL SPEED
2 SECS
3RD TACH
FAILURE
4TH TACH
FAILURE
5TH TACH
FAILURE
CONTINUING
TACH FAILURE
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADM1031ARQZ-REEL | 功能描述:板上安裝溫度傳感器 2 CH TDM PWM FAN CTRL IC 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 |
| ADM1031ARQZ-REEL7 | 功能描述:IC SENSOR 2TEMP/FAN CTRL 16QSOP 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 |
| ADM1032 | 制造商:AD 制造商全稱:Analog Devices 功能描述:+-1C Remote and Local System Temperature Monitor |
| ADM1032_12 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1C Remote and Local System Temperature Monitor Supports SMBus Alert |
| ADM1032AR | 功能描述:IC TEMP MONITOR 85DEG C 8SOIC RoHS:否 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 |
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