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MAX6651EEE Datasheet(PDF) 18 Page - Maxim Integrated Products

Part # MAX6651EEE
Description  Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface
PDF  25 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX6651EEE Datasheet(HTML) 18 Page - Maxim Integrated Products

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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.
Fan-Speed Regulators and Monitors
with SMBus/I2C-Compatible Interface
18
Maxim Integrated
MAX6650/MAX6651
MAX6650
VCC
SCL
10k
Ω
SDA
GPIO0
OUT
ADD
GND
FB
TACH0
VCC
3V TO 5.5V
VFAN
5V OR 12V
CCOMP
10
μF
SMBus/I2C
INTERFACE
GPIO1
FULL ON
ALERT
FAN
MAX6501
TOVER
Figure 11. MAX6501 Hardware Fail-Safe
MAX6650
VCC
SCL
10k
Ω
SDA
GPIO0
OUT
ADD
GND
FB
TACH0
VCC
3V TO 5.5V
VFAN
5V OR 12V
CCOMP
10
μF
SMBus/I2C
INTERFACE
GPIO1
FULL ON
ALERT
FAN
MAX6501
TOVER
MAX6501
TOVER
MAX6501
TOVER
Figure 12. MAX6501 Hardware Fail-Safe



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