OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MAX6661AEE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
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™ 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°C (max) when the remote junction is
between +60°C to +100°C. Data is formatted as a 10-
bit + sign word with 0.125°C resolution.
The MAX6661 is specified between -40°C to +125°C
and is available in a 16-pin QSOP package.
Applications
Telecom Systems
Servers
Workstations
Electronic Instruments
Features
♦ Integrated Thermal Measurement and Fan
Regulation
♦ Programmable Fan Threshold Temperature
♦ Programmable Temperature Range for Full-Scale
Fan Speed
♦ Accurate Closed-Loop Fan-Speed Regulation
♦ On-Chip Power Device Drives Fans Rated
Up to 250mA
♦ Programmable Under/Overtemperature Alarms
♦ SPI-Compatible Serial Interface
♦ ±1°C (+60°C to +100°C) Thermal-Sensing
Accuracy
MAX6661
Remote Temperature-Controlled Fan-Speed
Regulator with SPI-Compatible Interface
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
1µF
5kΩ
FAN
12V
2200pF
PENTIUM
SDIN
SC
ALERT
OVERT
SPI CLOCK
SPI DATA IN
DOUT
SPI DATA OUT
CS
SPI CHIP SELECT
INTERRUPT
TO µP
TO SYSTEM
SHUTDOWN
V
FAN
PGND
0.1µF
3V TO 5.5V
50Ω
V
CC
TACH IN
FAN
DXP
DXN
AGND
10kΩ
EACH
MAX6661
Typical Operating Circuit
19-2337; Rev 0; 1/02
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.
PART TEMP RANGE PIN-PACKAGE
MAX6661AEE -40°C to +125°C 16 QSOP
Pin Configuration appears at end of data sheet.
SPI is a trademark of Motorola, Inc.
MAX6661
Remote Temperature-Controlled Fan-Speed
Regulator with SPI-Compatible Interface
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= 3V to 5.5V, V
FAN
= 12V, T
A
= -40°C to +125°C, unless otherwise specified. Typical values are at V
CC
= 3.3V and T
A
=
+25°C.) (Notes 1 and 2)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
CC
, ALERT, OVERT ...............................................-0.3V to +6V
V
FAN
, TACH IN, FAN .............................................-0.3V to +16V
DXP, CS, SDOUT, GAIN, SCL, SDIN..........-0.3V to (V
CC
+ 0.3V)
DXN ..........................................................................-0.3V to +1V
SDOUT Current ...................................................-1mA to +50mA
DXN Current ......................................................................±1mA
FAN Out Current ..............................................................500mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW
Operating Temperature Range ........................ -40°C to +125°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ADC AND POWER SUPPLY
0.125 °C
Temperature Resolution
(Note 3)
11 Bits
T
RJ
= +60°C to +100°C-1 +1°C
T
RJ
= +25°C to +125°C-3 +3°C
Remote-Junction Temperature
Measurement Error (Note 4)
T
E
T
A
= +85°C,
V
CC
= 3.3V
T
RJ
= -40°C to +125°C-5 +5°C
Fan-Speed Measurement
Accuracy
±25 %
V
CC
Supply Voltage Range V
CC
3.0 5.5 V
V
FAN
Supply Voltage Range V
FAN
4.5 13.5 V
Conversion Time 0.25 s
Conversion Rate Timing Error -25 +25 %
Undervoltage Lockout (UVLO)
Threshold
V
UVLO
V
CC
falling 2.50 2.80 2.95 V
UVLO Threshold Hysteresis V
HYST
90 mV
POR Threshold (V
CC
)V
CC
rising 1.4 2.0 2.5 V
POR Threshold Hysteresis 90 mV
Standby Supply Current I
SHDN
Shutdown, configuration bit 6 = 1 3 20 µA
Operating Supply Current I
CC
Fan off 450 700 µA
DXN Source Voltage V
DXN
0.7 V
TACH Input Transition Level V
FAN
= 12V 10.5 V
TACH Input Hysteresis V
FAN
= 12V 190 mV
TACH Input Resistance 250 kΩ
Fan Output Current I
F
250 mA
Fan Output Current Limit I
L
(Note 5) 320 410 mA
Fan Output On-Resistance R
ONF
250mA load 4 Ω
MAX6661
Remote Temperature-Controlled Fan-Speed
Regulator with SPI-Compatible Interface
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3V to 5.5V, V
FAN
= 12V, T
A
= -40°C to +125°C, unless otherwise specified. Typical values are at V
CC
= 3.3V and T
A
=
+25°C.) (Notes 1 and 2)
Note 1: T
A
= T
J
. This implies zero dissipation in pass transistor (no load, or fan turned off).
Note 2: All parameters are 100% production tested at a single temperature, unless otherwise indicated. Parameter values through
temperature are guaranteed by design.
Note 3: The fan control section of the MAX6661 and temperature comparisons use only 9 bits of the 11-bit temperature measure-
ment with a 0.5°C LSB.
Note 4: Wide-range accuracy is guaranteed by design, not production tested.
Note 5: Guaranteed by design.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INTERFACE PINS (SDIN, SC, CS, DOUT, ALERT, OVERT)
Serial Bus Maximum Clock
Frequency (Note 5)
SC 2.5 MHz
V
CC
= 3V 2.2
Logic Input High Voltage
V
CC
= 5.5V 2.4
V
Logic Input Low Voltage V
CC
= 3V to 5V 0.8 V
Logic Output High-Voltage
DOUT
V
CC
= 3V, I
SOURCE
= 6mA (Note 5)
V
CC
-
0.4V
V
Logic Output Low-Voltage DOUT V
CC
= 3V, I
SINK
= 6mA (Note 5) 0.4 V
Logic Output Low-Voltage
ALERT, OVERT
V
CC
= 3V, I
SINK
= 6mA (Note 5) 0.4 V
ALERT, OVERT Output
High Leakage Current
ALERT, OVERT forced to 5.5V 1 µA
Logic Input Current Logic inputs forced to V
CC
or GND -2 2 µA
SPI AC TIMING (Figure 5)
CS High to DOUT Three-State t
TR
C
LOAD
= 100pF, R
GS
= 10kΩ (Note 5) 200 ns
CS to SC Setup Time t
CSS
(Note 5) 200 ns
SC Fall to DOUT Valid t
DO
C
LOAD
= 100pF 200 ns
DIN to SC Setup Time t
DS
200 ns
DIN to SC Hold Time t
DH
(Note 5) 200 ns
SC Period t
CP
400 ns
SC High Time t
CH
200 ns
SC Low Time t
CL
200 ns
CS High Pulse Width t
CSW
(Note 5) 400 ns
Output Rise Time t
R
C
LOAD
= 100pF 10 ns
Output Fall Time t
F
C
LOAD
= 100pF 10 ns
SC Falling Edge to CS Rising
t
SCS
(Note 5) 200 ns
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

MAX6661AEE+T

Mfr. #:
Buy MAX6661AEE+T
Manufacturer:
Maxim Integrated
Description:
SENSOR DIGITAL REMOTE 16QSOP
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet