Rainbow-electronics MAX6640 Manual de usuario descargar pdf (Pagina 5)

MAX6640

2-Channel Temperature Monitor with Dual

Automatic PWM Fan-Speed Controller

_______________________________________________________________________________________ 5

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 MAX6640’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 MAX6640’s

supply voltage.

FANFAIL

Active-Low, Open-Drain, Fan-Failure Output. Open circuit when V

= 0.

THERM

Active-Low, Open-Drain Thermal Alarm Output. Typically used for clock throttling. Open circuit when

= 0.

57OT

Active-Low, Open-Drain Overtemperature Output. Typically used for system shutdown or clock

throttling. Can be pulled up to 5.5V regardless of V

. Open circuit when V

= 0.

68V

Power-Supply Input. 3.3V nominal. Bypass V

to GND with a 0.1µF capacitor.

710GND Ground. Connect to a clean ground reference.

8, 10

9, 12

DXP1,

DXP2

C om b i ned C ur r ent S our ce and A/D P osi ti ve Inp ut for Rem ote D i od e. C onnect to anod e of r em ote- d i od e-

connected tem p er atur e- sensi ng tr ansi stor . D o not l eave fl oati ng ; connect to D X N i f no r em ote d i od e i s

used . P l ace a 2200p F cap aci tor b etw een D X P _ and D X N for noi se fi l ter i ng .

911DXN Connect Cathode of the Remote-Diode-Connected Transistor to DXN

11 13 V

Connect to V

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 V

. Open circuit when V

= 0.

14 15 SDA

SMBus Serial-Data Input/Output, Open Drain. Can be pulled up to 5.5V regardless of V

. Open

circuit when V

= 0.

Pin Description

Typical Operating Characteristics (continued)

= 3.3V, T

= +25°C)

PWMOUT FREQUENCY

vs. DIE TEMPERATURE

MAX6640 toc10

TEMPERATURE (°C)

PWMOUT FREQUENCY (Hz)

85603510-15

-40 110

PWMOUT FREQUENCY

vs. SUPPLY VOLTAGE

MAX6640 toc11

SUPPLY VOLTAGE (V)

PWMOUT FREQUENCY (Hz)

5.04.54.03.5

3.0 5.5

1 2 3 4 5 6 7 8 9 10 ... 21 22

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Rainbow-electronics MAX6640 Manual de usuario Pagina 5

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