MAX6651 데이터 시트보기 (PDF) - Maxim Integrated

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MAX6651

Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface

Maxim Integrated 

MAX6650/MAX6651

Fan-Speed Regulators and Monitors

with SMBus/I2C-Compatible Interface

VCC

3V TO 5.5V

SMBus/I2C

INTERFACE

MAX6501

TOVER

VCC

MAX6650

SCL

TACH0

SDA

FB

ALERT GPIO0

OUT

FULL ON

GPIO1

ADD

GND

VFAN

5V OR 12V

10kΩ

FAN

CCOMP

10μF

Figure 11. MAX6501 Hardware Fail-Safe

VCC

3V TO 5.5V

SMBus/I2C

INTERFACE

MAX6501

TOVER

MAX6501

TOVER

MAX6501

TOVER

VCC

MAX6650

SCL

TACH0

SDA

FB

ALERT GPIO0

OUT

FULL ON

GPIO1

ADD

GND

VFAN

5V OR 12V

10kΩ

FAN

CCOMP

10μF

Figure 12. MAX6501 Hardware Fail-Safe

independently control each fan. The disadvantage is

cost, size, and complexity.

For single fan control, use the MAX6650 (unless addi-

tional GPIOs are needed).

Parallel Fan Control

If multiple fans are required but independent control is

not, then a single MAX6650/MAX6651 connected to

two or more fans in parallel may make sense (Figure 7).

The obvious advantage is simplicity, size, and cost

savings. If all the fans connected in parallel are the

same type, they will tend to run at similar speeds.

However, if one or more of the fans are wearing out,

speed mismatches can occur. The MAX6651 allows the

system to monitor up to four fans, ensuring any signifi-

cant speed mismatches can be detected.

For parallel fan control while monitoring up to four fan

speeds, select the MAX6651.

18

Maxim Integrated

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