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| 型號： | 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)： | 21/47頁 |
| 文件大小： | 547K |
| 代理商： | AMC6821 |
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P
Fan Spin-Up
Normal
Control
DCY
100%
0
T
/3
SPIN-UP
T
SPIN-UP
33.3%
AMC6821
SBAS386A–MAY 2006–REVISED MAY 2006
The PWM duty cycle controls the cooling fan speed. To spin-up a fan from a stop or under-speed status, the
spin-up process is applied to overcome the fan inertia. During the first third of spin-up, the duty cycle of the
PWM gradually increases from 33.3% to 100%, and then maintains at 100% through the rest of the process. At
the end of the spin-up process, the duty cycle is adjusted to 33.3%. After starting, the fan speed is controlled
normally. The spin-up process is shown in
Figure 15
. The bits [STIME2:STIME0] (bits 2:0 of 0x20) define the
spin-up time, from 0.2 seconds to 8 seconds, as shown in
Table 6
. Fan speed is monitored immediately after the
spin-up process.
Spin-up is disabled by setting the FSPD bit of the
Fan Characteristics Register
to '1'. If disabled, the spin-up
process is not applied when the fan stops or an RPM is detected below the minimum speed. The TACH low limit
register defines the minimum speed.
Note that no FANS (fan-slow) detections are performed during spin-up. This bit is cleared ('0') only after reading
it, and reasserts '1' in the next monitoring if a fan-slow condition is detected. After spin-up, FANS is set ('1') even
if the TACH data are less than the TACH low limit until the flag is read.
Figure 15. Spin-Up Process
Table 6. Spin-Up Time
STIME2
0
0
0
0
1
1
1
1
STIME1
0
0
1
1
0
0
1
1
STIME0
0
1
0
1
0
1
0
1
SPIN-UP TIME (seconds)
0.2
0.4
0.6
0.8
1
2
4
8
21
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相關(guān)代理商/技術(shù)參數(shù) |
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/點(diǎn)火控制器和驅(qū)動器 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/點(diǎn)火控制器和驅(qū)動器 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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