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AMC6821 データシート(PDF) 21 Page - Texas Instruments

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部品番号 AMC6821
部品情報  Intelligent Temperature Monitor and PWM Fan Controller
PDF  54 Pages
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

AMC6821 データシート(HTML) 21 Page - Texas Instruments

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PWM_OUT
2s
2s
2s
TACH
INT
FAN_FAULT
Full-Speed
Continuing
TACHFailure
StatusRegisterReadtoClearInterrupt
FourthTACHFailure
FifthTACH
Failure
ThirdTACHFailure
FAN-FAULT PIN
FAN-FAULT
+V
10kW
AMC6821
FanFailure
(belowminimumspeed
afterfifthspin-up)
PinisEnabled
(F
AUL -ENbit=1)
AN-F
T
AMC6821
SBAS386C – MAY 2006 – REVISED JULY 2007
The SMBALERT pin continues to generate interrupts after the assertion of the FAN-FAULT pin because the tach
measurement continues even after a fan failure. Should the fan recover from the failure condition, the
FAN-FAULT pin signal is negated and the fan returns to normal operating speed. Figure 20 shows the operation
of a FANS interrupt.
INT is a Fan-Slow (FANS) Interrupt Through the SMBALERT Pin
Figure 20. Operation of the FAN-FAULT Pin with a Spin-Up Time = 2 Seconds
The FAN-FAULT pin is an open-drain output pin, as shown in Figure 21. When the FAN-FAULT-EN bit of
Configuration Register 1 is cleared ('0'), this pin is disabled and is always in a high-impedance status. When
FAN-FAULT-EN = 1, the pin is enabled and the status indicates a fan-failure. The pin asserts low when a fan
failure occurs. FAN-FAULT is negated when the fan returns to normal speed.
Figure 21. FAN-FAULT Pin
Copyright © 2006–2007, Texas Instruments Incorporated
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