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MAX6661 Datasheet

  • MAX6661

  • Remote Temperature-Controlled Fan-Speed Regulator with SPI-C...

  • 257.60KB

  • Maxim

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19-2337; Rev 0; 1/02
Remote Temperature-Controlled Fan-Speed
Regulator with SPI-Compatible Interface
General Description
The MAX6661 is a remote temperature sensor and fan-
speed regulator that provides complete closed-loop fan
control. The remote temperature sensor is typically a
common-collector PNP, such as a substrate PNP of a
microprocessor, or a diode-connected transistor, typi-
cally a low-cost, easily mounted 2N3904 NPN type or
2N3906 PNP type.
The device also incorporates a closed-loop fan con-
troller that regulates fan speed with tachometer feed-
back. The MAX6661 compares temperature data to a
fan threshold temperature and gain setting, both pro-
grammed over the SPI鈩?bus by the user. The result is
automatic fan control that is proportional to the remote-
junction temperature. The temperature feedback loop
can be broken at any time for system control over the
speed of the fan.
Fan speed is voltage controlled as opposed to PWM
controlled, greatly reducing acoustic noise and maxi-
mizing fan reliability. An on-chip power device drives
fans rated up to 250mA.
Temperature data is updated every 500ms and is read-
able at any time over the SPI interface. The MAX6661 is
accurate to 1掳C (max) when the remote junction is
between +60掳C to +100掳C. Data is formatted as a 10-
bit + sign word with 0.125掳C resolution.
The MAX6661 is specified between -40掳C to +125掳C
and is available in a 16-pin QSOP package.
Features
o
Integrated Thermal Measurement and Fan
Regulation
o
Programmable Fan Threshold Temperature
o
Programmable Temperature Range for Full-Scale
Fan Speed
o
Accurate Closed-Loop Fan-Speed Regulation
o
On-Chip Power Device Drives Fans Rated
Up to 250mA
o
Programmable Under/Overtemperature Alarms
o
SPI-Compatible Serial Interface
o
卤1掳C (+60掳C to +100掳C) Thermal-Sensing
Accuracy
MAX6661
Ordering Information
PART
MAX6661AEE
TEMP RANGE
-40掳C to +125掳C
PIN-PACKAGE
16 QSOP
Typical Operating Circuit
12V
0.1碌F
3V TO 5.5V
50鈩?/div>
10k鈩?/div>
EACH
Applications
Telecom Systems
Servers
Workstations
Electronic Instruments
1碌F
5k鈩?/div>
V
FAN
V
CC
ALERT
INTERRUPT
TO
碌P
TO SYSTEM
SHUTDOWN
FAN
TACH IN
OVERT
FAN
DXP
2200pF
MAX6661
SC
SDIN
DOUT
SPI CLOCK
SPI DATA IN
SPI DATA OUT
SPI CHIP SELECT
DXN
CS
Pin Configuration appears at end of data sheet.
SPI is a trademark of Motorola, Inc.
PENTIUM
AGND
PGND
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

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