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MAX6639 Datasheet(PDF) 5 Page - Maxim Integrated Products

Part No. MAX6639
Description  2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX6639 Datasheet(HTML) 5 Page - Maxim Integrated Products

 
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2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
_______________________________________________________________________________________
5
PIN
TQFN
QSOP
NAME
FUNCTION
1, 15
3, 1
PWM2,
PWM1
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
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.
35
FANFAIL Active-Low, Open-Drain, Fan-Failure Output. Open circuit when VCC = 0.
46
THERM
Active-Low, Open-Drain Thermal Alarm Output. Typically used for clock throttling. Open circuit when
VCC = 0.
57
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.
68
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
DXP1,
DXP2
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.
9
11
DXN
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.
Pin Description
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25°C.)
PWMOUT FREQUENCY
vs. DIE TEMPERATURE
TEMPERATURE (
°C)
85
60
35
10
-15
31
32
33
34
35
30
-40
110
PWMOUT FREQUENCY
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
5.0
4.5
4.0
3.5
31
32
33
34
35
30
3.0
5.5


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