MAX6639 データシートの表示（PDF） - Maxim Integrated
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MAX6639 Datasheet PDF : 22 Pages
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MAX6639/MAX6639F
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 85 110
TEMPERATURE (°C)
30
3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
Pin Description
PIN
TQFN-EP QSOP
1, 15
3, 1
2, 16
3
4
5
6
7
8, 10
9
11
12
13
14
4, 2
5
6
7
8
10
9, 12
11
13
14
16
15
—
—
NAME
FUNCTION
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.
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.
FANFAIL Active-Low, Open-Drain, Fan-Failure Output. Open circuit when VCC = 0.
THERM Active-Low, Open-Drain Thermal Alarm Output. Typically used for clock throttling. Open circuit
when VCC = 0.
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.
VCC Power-Supply Input. 3.3V nominal. Bypass VCC to GND with a 0.1µF capacitor.
GND Ground. Connect to a clean ground reference.
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 unconnected; connect to DXN if no
remote diode is used. Place a 2200pF capacitor between DXP_ and DXN for noise filtering.
DXN Remote Diode Current Sink Input. Connect Cathode of the Remote-Diode-Connected Transistor to DXN
ADD
Address Input. Sets device slave address. Connect to GND, VCC, or leave unconnected to give
three unique addresses. See Table 1.
ALERT Active-Low, Open-Drain SMBus Alert Output
SCL SMBus Serial-Clock Input. Can be pulled up to 5.5V regardless of VCC. Open circuit when VCC =
SDA
EP
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 EP to a large PCB pad
for optimum performance and enhanced thermal dissipation. Not intended as an electrical
connection point.
Maxim Integrated
5
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