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| 型號(hào)： | AMC6821 |
| 英文描述： | Analog Monitor and Control Circuit |
| 中文描述： | 模擬監(jiān)視和控制電路 |
| 文件頁數(shù)： | 16/47頁 |
| 文件大小： | 547K |
| 代理商： | AMC6821 |
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P
RPM Alarm (TACH is less than the high limit)
(RPM out-of-range)
FANIE
(FAN-TACH interrupt enabled)
FANS (TACH is greater than the low limit)
FAN-ORN Interrupt
AMC6821
SBAS386A–MAY 2006–REVISED MAY 2006
Some fans (such as the four-wire fan from JMC
) are powered directly by dc power, instead of being powered
by the PWM. In this case, the TACH mode must be set to '1'. When TACH-MODE = 1, the PWM-Out pin is not
forced ON; instead, the status is controlled completely by the DCY register, just as in normal operation. Setting
TACH-MODE to '1' also disables the internal correction circuit because no extra duty cycle is applied. Setting the
TACH mode to '1' allows TACH reading continuously, regardless of the status of the PWM-Out pin.
The selection of the TACH mode affects the RPM monitoring and control. When the TACH-MODE bit is equal to
'1', the duty cycle of the PWM-Out pin is always determined by the calculated value; the TACH data are always
updated at every RPM monitoring. However, when the TACH-MODE bit is equal to '0', in the Software-RPM
Control mode the PWM-Out pin is forced to 30% if the calculated duty cycle is less than 30%; in other modes,
the PWM-Out pin is forced to 0% and the TACH data is not updated if the calculated duty cycle is less than 7%.
FAN RPM Out-of-Range Detection
The larger value of the TACH data corresponds to a slower speed. When the TACH data are larger than the
TACH-Low-Limit, the fan runs at a speed below the predefined minimum RPM, and the FANS bit in
Status
Register 1
is set to '1'. Note that no FANS (fan-slow) detections are made during spin-up. The FANS bit is
cleared ('0') only after reading this register and reasserted ('1') in the next monitoring if a fan-slow is detected.
After spin-up, FANS is set ('1') even if the TACH data are less than the TACH-Low-Limit until the register is
read.
When the TACH data are less than the TACH-High-Limit, the fan runs at a speed above the predefined
maximum RPM, and the RPM-ALARM bit in
Status Register 1
is set ('1'). Note that the RPM-ALARM bit is
cleared when reading the register. Once cleared, this bit is not reasserted in the next monitoring cycle even if
the condition persists. This bit may be reasserted only if the RPM drops below the allowed maximum speed.
When FANS = 1 or RPM-ALARM = 1, there is a fan-out-of-range interrupt and FAN-ORN is generated if the
FANIE bit in
Configuration Register 1
is set ('1'). This interrupt makes the SMBALERT pin go low.
Figure 9. RPM Out-of-Range Detection
16
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參數(shù)描述 |
|---|---|
| AMC6821EVM | 功能描述:溫度傳感器開發(fā)工具 ANA MONITOR RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:Temperature Sensors and Control ICs 工具用于評(píng)估:MSP430G2553 接口類型:USB 工作電源電壓: 工作電源電流: |
| AMC6821EVM-PDK | 功能描述:溫度傳感器開發(fā)工具 THERMAL MGMT RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:Temperature Sensors and Control ICs 工具用于評(píng)估:MSP430G2553 接口類型:USB 工作電源電壓: 工作電源電流: |
| AMC6821-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:INTELLIGENT TEMPERATURE MONITOR AND PWM FAN CONTROLLER |
| AMC6821SDBQ | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Temp Monitoring and Fan Ctrl RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| AMC6821SDBQG4 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Temp Monitoring and Fan Ctrl RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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