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PDF MAX6640 Data sheet ( Hoja de datos )
| Número de pieza | MAX6640 | |
| Descripción | 2-Channel Temperature Monitor | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX6640 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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19-3344; Rev 2; 10/08
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
2-Channel Temperature Monitor with Dual
Automatic PWM Fan-Speed Controller
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
(SMBusTM) 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
SMBus is a trademark of Intel Corp.
Typical Operating Circuit appears at end of data sheet.
Features
o Two Thermal-Diode Inputs
o Local Temperature Sensor
o 1°C Remote Temperature Accuracy (+60°C to
+100°C)
o Two PWM Outputs for Fan Drive (Open Drain; can
be Pulled Up to +13.5V)
o Programmable Fan-Control Characteristics
o Automatic Fan Spin-Up Ensures Fan Start
o Controlled Rate-of-Change Ensures Unobtrusive
Fan-Speed Adjustments
o ±4% Fan-Speed Measurement Accuracy
o Temperature Monitoring Begins at POR for Fail-
Safe System Protection
o OT and THERM Outputs for Throttling or
Shutdown
o Measures Temperatures Up to +150°C
o Tiny 5mm x 5mm 16-Pin TQFN and QSOP
Packages
Ordering Information
PART
OPERATING MEASUREMENT PIN-
RANGE
RANGE
PACKAGE
MAX6640AEE+
-40°C to
+125°C
0°C to +150°C 16 QSOP
MAX6640ATE+
-40°C to
+125°C
0°C to +150°C 16 TQFN-EP*
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configurations
TOP VIEW
+
PWM1 1
TACH1 2
PWM2 3
TACH2 4
MAX6640
FANFAIL 5
THERM 6
OT 7
VCC 8
QSOP
16 SCL
15 SDA
14 ALERT
13 I.C.
12 DXP2
11 DXN
10 GND
9 DXP1
+ 16 15 14 13
PWM2 1
TACH2 2
FANFAIL 3
THERM 4
MAX6640
*CONNECT EXPOSED
PAD TO GND
5678
12 ALERT
11 I.C.
10 DXP2
9 DXN
5mm x 5mm THIN QFN
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
www.DataSheet4U.com
2-Channel Temperature Monitor with Dual
Automatic PWM Fan-Speed Controller
(VCC = 3.3V, TA = +25°C.)
35
Typical Operating Characteristics (continued)
PWMOUT FREQUENCY
vs. DIE TEMPERATURE
PWMOUT FREQUENCY
vs. SUPPLY VOLTAGE
35
34 34
33 33
32 32
31 31
30
-40 -15 10 35 60 85 110
TEMPERATURE (°C)
30
3.0
3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
Pin Description
PIN
TQFN-EP QSOP
1, 15
3, 1
2, 16
3
4
5
6
7
8, 10
4, 2
5
6
7
8
10
9, 12
9 11
11 13
12 14
13 16
14 15
——
NAME
PWM2,
PWM1
TACH2,
TACH1
FANFAIL
THERM
OT
VCC
GND
DXP1,
DXP2
DXN
I.C.
ALERT
SCL
SDA
EP
FUNCTION
Open-Drain Output to Power Transistor Driving Fan. Connect to the gate of a MOSFET or base of a
bipolar transistor. PWM_ requires a pullup resistor. The pullup resistor can be connected to a
supply voltage as high as 13.5V, regardless of the MAX6640’s supply voltage.
Tachometer Inputs. Connect to the tachometer output of the fan. TACH_ requires a pullup resistor.
The pullup resistor can be connected to a supply voltage as high as 13.5V, regardless of the
MAX6640’s supply voltage.
Active-Low, Open-Drain, Fan-Failure Output. Open circuit when VCC = 0.
Active-Low, Open-Drain Thermal Alarm Output. Typically used for clock throttling. Open circuit
when VCC = 0.
Active-Low, Open-Drain Overtemperature Output. Typically used for system shutdown or clock
throttling. Can be pulled up to 5.5V regardless of VCC. Open circuit when VCC = 0.
Power-Supply Input. 3.3V nominal. Bypass VCC to GND with a 0.1µF capacitor.
Ground. Connect to a clean ground reference.
Combined Current Source and A/D Positive Input for Remote Diode. Connect to anode of remote-
diode-connected temperature-sensing transistor. Do not leave unconnected; connect to DXN if no
remote diode is used. Place a 2200pF capacitor between DXP_ and DXN for noise filtering.
Combined Current Sink and A/D Negative Input for Remote Diode. Connect cathode of the remote-
diode-connected transistor to DXN.
Internally Connected. Connect to VCC.
Active-Low, Open-Drain SMBus Alert Output
SMBus Serial-Clock Input. Can be pulled up to 5.5V regardless of VCC. Open circuit when VCC = 0.
SMBus Serial-Data Input/Output, Open Drain. Can be pulled up to 5.5V regardless of VCC. Open
circuit when VCC = 0.
Exposed Pad (TQFN package only). Internally connected to GND. Connect to a large ground
plane to maximize thermal performance. Not intended as an electrical connection point.
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
2-Channel Temperature Monitor with Dual
Automatic PWM Fan-Speed Controller
Table 3. Register Map
READ/
WRITE
REGISTER
NO.
ADDRESS
POR
STATE
FUNCTION
D7
D6
D5
D4
D3
D2
D1 D0
R
00h
0000 Temperature MSB
0000 channel 1 (+128°C)
—
—
—
—
—
—
LSB
(1°C)
R
01h
0000 Temperature MSB
0000 channel 2 (+128°C)
—
—
—
—
—
—
LSB
(1°C)
R
02h
0000
0000
Status byte
Channel 1
ALERT
Channel 2
ALERT
Channel 1
OT
Channel 2
OT
Channel 1
THERM
Channel 2
THERM
Fan 1 fault
Fan 2
fault
R/W
03h
0000
0011
Output mask
Channel 1
ALERT
Channel 2
ALERT
Channel 1
OT
Channel 2
OT
Channel 1
THERM
Channel 2
THERM
Fan 1 fault
Fan 2
fault
SMBus Temp
Run timeout channel 2
R/W
04h
0011
Global
0 = run,
POR
0 = source: Reserved Reserved Reserved Reserved
0000
configuration
1= stby
1 = reset enabled, 1 = local,
1 = 0 = remote
disabled
2
R
05h
0000
0000
Channel 1
extended
temperature
MSB
(0.5°C)
— LSB Reserved Reserved Reserved Reserved Diode
(0.125°C)
fault
R
06h
0000
Channel 2
extended
MSB
—
LSB Reserved Reserved Reserved Reserved Diode
0000 temperature (0.5°C)
(0.125°C)
fault
R/W
08h
0101 Channel 1
0101 ALERT limit
MSB
—
—
—
—
—
—
LSB
(1°C)
R/W
09h
0101 Channel 2
0101 ALERT limit
MSB
—
—
—
—
—
—
LSB
(1°C)
R/W 0Ah 0110 Channel 1 OT MSB
—
—
—
—
—
— LSB
1110
limit
(1°C)
R/W
0Bh
0110 Channel 2 OT
1110
limit
MSB
—
—
—
—
—
—
LSB
(1°C)
R/W
0Ch
0101 Channel 1
0101 THERM limit
MSB
—
—
—
—
—
—
LSB
(1°C)
R/W
0Dh
0101 Channel 2
0101 THERM limit
MSB
—
—
—
—
—
—
LSB
(1°C)
Fan 1
Rate of
Rate of Fan 1
Fan 1
RPM
RPM
R/W
10h
1000
0010
configuration
1
PWM
mode
change
(MSB)
Rate of
change
change channel 1 channel 2
(LSB) control control
range
select
range
select
Minimum
Fan 1 RPM step-
RPM step- Temp
Temp
PWM
fan
R/W
11h
0000
0000
Configuration
2a
size A
(MSB)
RPM step- RPM step-
size A size A
size A
(LSB)
step-size
A (MSB)
step-size
A (LSB)
100% duty
cycle
speed
0 = 0%,
1= value
in 22h
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet MAX6640.PDF ] | |
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