MAX6639(2005) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX6639
(Rev.:2005)

2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller

Maxim Integrated 

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 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

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