MAX6651 MAXIM [Maxim Integrated Products], MAX6651 Datasheet
MAX6651
Manufacturer Part Number
MAX6651
Description
Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
1.MAX6651.pdf
(25 pages)
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The MAX6650/MAX6651 fan controllers use an
SMBus™/I
itor the speed of 5VDC/12VDC brushless fans with built-in
tachometers. They automatically force the fan’s tachome-
ter frequency (fan speed) to match a preprogrammed
value in the Fan-Speed Register by using an external
MOSFET or bipolar transistor to linearly regulate the volt-
age across the fan. The MAX6650 regulates the speed of
a single fan by monitoring its tachometer output. The
MAX6651 also regulates the speed of a single fan, but it
contains additional tachometer inputs to monitor up to four
fans and control them as a single unit when they are used
in parallel.
The MAX6650/MAX6651 provide general-purpose
input/output (GPIO) pins that serve as digital inputs,
digital outputs, or various hardware interfaces. Capable
of sinking 10mA, these open-drain inputs/outputs can
drive an LED. To add additional hardware control, con-
figure GPIO1 to fully turn on the fan in case of software
failure. To generate an interrupt when a fault condition
is detected, configure GPIO0 to behave as an active-
low alert output. Synchronize multiple devices by set-
ting GPIO2 (MAX6651 only) as an internal clock output
or an external clock input.
The MAX6650 is available in a space-saving 10-pin
µMAX package, and the MAX6651 is available in a
small 16-pin QSOP package.
19-1784; Rev 2; 12/01
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
________________________Applications
RAID
Servers
Workstations
2
C™-compatible interface to regulate and mon-
________________________________________________________________ Maxim Integrated Products
General Description
INTERFACE
3V TO 5.5V
SMBus/I
Desktop Computers
Networking
Telecommunications
with SMBus/I
V
CC
2
C
Fan-Speed Regulators and Monitors
LED
FULL ON
ALERT
V
SCL
SDA
GPIO0
GPIO1
CC
MAX6650
2
C-Compatible Interface
o Closed/Open-Loop Fan-Speed Control for
o 2-Wire SMBus/I
o Monitors Tachometer Output
o Programmable Alert Output
o GPIOs
o Hardware Full-On Override
o Synchronize Multiple Fans
o Four Selectable Slave Addresses
o 3V to 5.5V Supply Voltage
o Small Packages
____________________________Features
Pin Configurations appear at end of data sheet.
SMBus is a trademark of Intel Corp.
I
2
MAX6650EUB
MAX6651EEE
TACH0
C is a trademark of Philips Corp.
5V/12V Fans
GND
OUT
ADD
FB
10-Pin µMAX (MAX6650)
16-Pin QSOP (MAX6651)
Single Tachometer (MAX6650)
Up to Four Tachometers (MAX6651)
PART
10kΩ
5V OR 12V
Typical Operating Circuit
V
2
FAN
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
C-Compatible Interface
FAN
C
10µF
Ordering Information
COMP
PIN-PACKAGE
10 µMAX
16 QSOP
1
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