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PDF MAX6639 Data sheet ( Hoja de datos )
| Número de pieza | MAX6639 | |
| Descripción | 2-Channel Temperature Monitor | |
| Fabricantes | Maxim Integrated Products | |
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19-3682; Rev 0; 5/05
2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
General Description
The MAX6639 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 MAX6639 is available in 16-pin QSOP and 16-pin
TQFN 5mm x 5mm packages. It operates from 3.0V to
5.5V and consumes just 500µA of supply current.
Applications
Desktop Computers
Notebook Computers
Projectors
Servers
Networking Equipment
SMBus is a trademark of Intel Corp.
Typical Application Circuit appears at end of data sheet.
Features
♦ 2 Thermal-Diode Inputs
♦ Up to 25kHz PWM Output Frequency
♦ 3 Selectable SMBus Addresses
♦ Local Temperature Sensor
♦ 1°C Remote Temperature Accuracy
♦ 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
♦ ±3% 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
Ordering Information
PART
OPERATING MEASUREMENT PIN-
RANGE
RANGE
PACKAGE
MAX6639AEE
-40°C to
+125°C
0°C to +150°C 16 QSOP
MAX6639ATE
-40°C to
+125°C
0°C to +150°C
16 TQFN
(5mm x
5mm)
Pin Configurations
TOP VIEW
PWM1 1
TACH1 2
PWM2 3
TACH2 4
FANFAIL 5
THERM 6
OT 7
VCC 8
MAX6639
QSOP
16 SCL
15 SDA
14 ALERT
13 ADD
12 DXP2
11 DXN
10 GND
9 DXP1
12 11 10 9
SCL 13
8 DXP1
SDA 14
PWM1 15
TACH1 16
MAX6639
*CONNECT EXPOSED
PADDLE TO GND
7 GND
6 VCC
5 OT
1234
THIN QFN
5 mm x 5 mm
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
(VCC = 3.3V, TA = +25°C.)
Typical Operating Characteristics (continued)
PWMOUT FREQUENCY
vs. DIE TEMPERATURE
35
PWMOUT FREQUENCY
vs. SUPPLY VOLTAGE
35
34 34
33 33
32 32
31 31
30
-40 -15
10 35 60 85
TEMPERATURE (°C)
110
30
3.0
3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
Pin Description
PIN
TQFN QSOP
1, 15 3, 1
NAME
PWM2,
PWM1
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 MAX6639’s supply voltage.
2, 16
3
4, 2
TACH2,
TACH1
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 MAX6639’s
supply voltage.
5 FANFAIL Active-Low, Open-Drain, Fan-Failure Output. Open circuit when VCC = 0.
4 6 THERM Active-Low, Open-Drain Thermal Alarm Output. Typically used for clock throttling. Open circuit when
VCC = 0.
5
7
OT 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.
6 8 VCC Power-Supply Input. 3.3V nominal. Bypass VCC to GND with a 0.1µF capacitor.
7 10 GND Ground. Connect to a clean ground reference.
8, 10 9, 12
9 11
DXP1,
DXP2
DXN
Combined Current Source and A/D Positive Input for Remote Diode. Connect to anode of remote-diode-
connected temperature-sensing transistor. Do not leave floating; connect to DXN if no remote diode is
used. Place a 2200pF capacitor between DXP_ and DXN for noise filtering.
Connect Cathode of the Remote-Diode-Connected Transistor to DXN
11
13
ADD
Address Input. Sets device slave address. Connect to GND, VCC, or leave floating to give three unique
addresses. See Table 1.
12 14 ALERT Active-Low, Open-Drain SMBus Alert Output
13 16 SCL SMBus Serial-Clock Input. Can be pulled up to 5.5V regardless of VCC. Open circuit when VCC = 0.
14
15
SDA
SMBus Serial-Data Input/Output, Open Drain. Can be pulled up to 5.5V regardless of VCC. Open
circuit when VCC = 0.
_______________________________________________________________________________________ 5
5 Page 
2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
Table 4. 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 PWM
R/W
04h
0011
0000
Global
configuration
0 = run,
1= stby
POR:
1 = reset
0=
enabled,
source:
1 = local,
output
frequency
Reserved
Reserved Reserved
1 = 0 = remote range
disabled
2
R
05h
0000
0000
Channel 1
extended
temperature
MSB
(0.5°C)
—
LSB
(0.125°C)
Reserved
Reserved
Reserved
Reserved
Diode
fault
R
06h
0000
0000
Channel 2
extended
temperature
MSB
(0.5°C)
—
LSB
(0.125°C)
Reserved
Reserved
Reserved
Reserved
Diode
fault
R/W
08h
0101 Channel 1
0101 ALERT limit
MSB
—
—
—
—
—
— LSB
(1°C)
0101 Channel 2
LSB
R/W 09h 0101 ALERT limit MSB
—
—
—
—
—
— (1°C)
R/W
0Ah
0110 Channel 1 OT
1110
limit
MSB
—
—
—
—
—
—
LSB
(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)
R/W
10h
1000
0010
Fan 1
configuration
1
PWM
mode
Rate of
change
(MSB)
Rate of
change
Rate of Fan 1 Fan 1
change channel 1 channel 2
(LSB) control control
RPM
range
select
RPM
range
select
Minimum
R/W
11h
0000
0000
Fan 1
Configuration
2a
RPM step-
size A
(MSB)
RPM step-
size A
RPM step-
size A
RPM step-
size A
(LSB)
Temp
step-size
A (MSB)
Temp
step-size
A (LSB)
PWM
Polarity
fan
speed:
0 = 0%,
1= value
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MAX6639.PDF ] | |
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