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MAX6640AEE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
General Description
The MAX6640 monitors its own temperature and one
external diode-connected transistor or the temperatures
of two external diode-connected transistors, typically
available in CPUs, FPGAs, or GPUs. The 2-wire serial
interface accepts standard System Management Bus
(SMBus
TM
) write byte, read byte, send byte, and
receive byte commands to read the temperature data
and program the alarm thresholds. Temperature data
can be read at any time over the SMBus, and three pro-
grammable alarm outputs can be used to generate
interrupts, throttle signals, or overtemperature shut-
down signals.
The temperature data is also used by the internal dual
PWM fan-speed controller to adjust the speed of up to
two cooling fans, thereby minimizing noise when the
system is running cool, but providing maximum cooling
when power dissipation increases. Speed control is
accomplished by tachometer feedback from the fan, so
that the speed of the fan is controlled, not just the PWM
duty cycle. Accuracy of speed measurement is ±4%.
The MAX6640 is available in 16-pin QSOP and 16-pin
TQFN 5mm x 5mm packages. It operates from 3.0V to
3.6V and consumes just 500μA of supply current.
Applications
Desktop Computers
Notebook Computers
Workstations
Servers
Networking Equipment
Features
♦ Two Thermal-Diode Inputs
♦ Local Temperature Sensor
♦ 1°C Remote Temperature Accuracy (+60°C to
+100°C)
♦ Two PWM Outputs for Fan Drive (Open Drain; can
be Pulled Up to +13.5V)
♦ Programmable Fan-Control Characteristics
♦ Automatic Fan Spin-Up Ensures Fan Start
♦ Controlled Rate-of-Change Ensures Unobtrusive
Fan-Speed Adjustments
♦ ±4% Fan-Speed Measurement Accuracy
♦ Temperature Monitoring Begins at POR for Fail-
Safe System Protection
♦ OT and THERM Outputs for Throttling or
Shutdown
♦ Measures Temperatures Up to +150°C
♦ Tiny 5mm x 5mm 16-Pin TQFN and QSOP
Packages
MAX6640
2-Channel Temperature Monitor with Dual
Automatic PWM Fan-Speed Controller
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-3344; Rev 2; 10/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
PART
O PER A T IN G
R A NG E
M EA SU R EM EN T
R A N G E
PIN-
PACKAGE
M AX6640AE E +
-40°C to
+125°C
0°C to +150°C 16 QSOP
M AX6640ATE +
-40°C to
+125°C
0°C to +150°C 16 TQFN- EP*
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
PWM1
SCL
SDA
I.C.
DXP2
DXN
GND
DXP1
TOP VIEW
MAX6640
QSOP
TACH1
PWM2
TACH2
V
CC
FANFAIL
THERM
OT
ALERT
PWM2 1
TACH2 2
3
4
FANFAIL
THERM
12
I.C.11
10
9
DXP2
DXN
5
V
CC
6 7 8
GND
DXP1
OT
16
PWM1
15 14 13
SDA
SCL
TACH1
ALERT
MAX6640
*CONNECT EXPOSED
PAD TO GND
5mm x 5mm THIN QFN
+
+
Pin Configurations
SMBus is a trademark of Intel Corp.
Typical Operating Circuit appears at end of data sheet.
+
Denotes a lead-free/RoHS-compliant package.
*
EP = Exposed pad.
MAX6640
2-Channel Temperature Monitor with Dual
Automatic PWM Fan-Speed Controller
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, T
A
= 0°C to +125°C, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +85°C.) (Note 1)
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
to GND..............................................................-0.3V to +6V
PWM1, PWM2, TACH1, and TACH2 to GND......-0.3V to +13.5V
DXP1 and DXP2 to GND ..........................-0.3V to +(V
CC
+ 0.3V)
DXN to GND ..........................................................-0.3V to +0.8V
SCL, SDA, THERM, OT, FANFAIL,
and ALERT to GND..............................................-0.3V to +6V
SDA, OT, THERM, ALERT, FANFAIL,
PWM1, and PWM2 Current .............................-1mA to +50mA
DXN Current .......................................................................±1mA
ESD Protection (all pins, Human Body Model)..................2000V
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derated 8.3mW/°C above +70°C)....... 667mW
16-Pin TQFN 5mm x 5mm
(derated at 33.3mW/°C above +70°C)................2666.7mW
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
Operating Supply Voltage Range V
CC
+3.0 +3.6 V
Standby Current SMB static, sleep mode 3 10 μA
Operating Current Interface inactive, ADC active 0.5 1 mA
V
CC
= +3.3V, +60°C ≤ T
A
≤ +100°C and
+60°C ≤ T
R
≤ +100°C
±1
V
CC
= +3.3V, +40°C ≤ T
A
≤ +100°C and
0°C ≤ T
R
≤ +145°C
±2.5
External Temperature Error
V
CC
= +3.3V,
0°C ≤ T
R
≤ +145°C
±3.8
°C
V
CC
= +3.3V,
+25°C ≤ T
A
≤ +100°C
±2
Internal Temperature Error
V
CC
= +3.3V,
0°C ≤ T
A
≤ +125°C
±4
°C
Supply Sensitivity of Temperature
Measurement
±0.2 °C/V
+0.125 °C
Temperature Resolution
11 Bits
Conversion Time 125 ms
Conversion-Rate Timing Error -10 +10 %
PWM Frequency Error -10 +10 %
Tachometer Accuracy
V
CC
= 3.135V to 3.345V,
+60°C ≤ T
A
≤ +85°C
±4 %
High level 70 100 130
Remote-Diode Sourcing Current
Low level 7.0 10 13.0
μA
DXN Source Voltage 0.7 V
MAX6640
2-Channel Temperature Monitor with Dual
Automatic PWM Fan-Speed Controller
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, T
A
= 0°C to +125°C, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +85°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DIGITAL INPUTS AND OUTPUTS
ALERT, FANFAIL, THERM, OT
SDA I
SINK
= 6mA
0.4
Output Low Voltage (Sink
Current) (OT, ALERT, FANFAIL,
THERM, SDA, PWM1, and PWM2)
V
OL
PWM1, PWM2, I
SINK
= 4mA 0.4
V
Output High Leakage Current
(OT, ALERT , FANFAIL, THERM,
SDA, PWM1, and PWM2)
I
OH
1μA
Logic-Low Input Voltage (SDA,
SCL, THERM, TACH1, TACH2)
V
IL
0.8 V
Logic-High Input Voltage (SDA,
SCL, THERM, TACH1, TACH2)
V
IH
V
CC
= 3.3V 2.1 V
Input Leakage Current (SDA,
SCL, THERM, TACH1, TACH2)
V
IN
= V
CC
or GND 1 μA
Input Capacitance C
IN
5pF
SMBus TIMING (Note 2)
Serial Clock Frequency f
SCL
(Note 3) 10 100 kHz
Clock Low Period t
LOW
10% to 10% 4 μs
Clock High Period t
HIGH
90% to 90% 4.7 μs
Bus Free Time Between Stop and
Start Condition
t
BUF
4.7 μs
SMBus Start Condition Setup
Time
t
SU:STA
90% of SMBCLK to 90% of SMBDATA 4.7 μs
Start Condition Hold Time t
HD:STO
10% of SDA to 10% of SCL 4 μs
Stop Condition Setup Time t
SU:STO
90% of SCL to 10% of SDA 4 μs
Data Setup Time t
SU:DAT
10% of SDA to 10% of SCL 250 ns
Data Hold Time t
HD:DAT
10% of SCL to 10% of SDA (Note 4) 300 ns
SMBus Fall Time t
F
300 ns
SMBus Rise Time t
R
1000 ns
SMBus Timeout t
TIMEOUT
58 74 90 ms
Note 1: All parameters tested at a single temperature. Specifications are guaranteed by design.
Note 2: Timing specifications guaranteed by design.
Note 3: The serial interface resets when SCL is low for more than t
TIMEOUT
.
Note 4: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SCL's falling edge.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

MAX6640AEE+T

Mfr. #:
Buy MAX6640AEE+T
Manufacturer:
Maxim Integrated
Description:
SENSOR DIGITAL 0C-150C 16QSOP
Lifecycle:
New from this manufacturer.
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