MAX6639FATE+【PDF 5/22 页】IC 2CH TEMP MONITOR 16TQFN

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Sheet目录44

1页 2页 3页 4页 [5页]6页 7页 8页 9页

2-Channel Temperature Monitor with Dual,

Automatic, PWM Fan-Speed Controller

Maxim Integrated

MAX6639/MAX6639F

T FN-EP 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 MAX6639s 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

MAX6639s 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 V

= 0.

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.

Power-Supply Input. 3.3V nominal. Bypass V

to GND with a 0.1礔 capacitor.

GND

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

connected tem p er atur e-

sensi ng

ansi stor . D o not l eave unconnected ; 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 .

DXN

Rem ote D i od e C ur r ent S i nk Inp

ut. C onnect C athod e of the Rem ote- D i od e-

C onnected Tr ansi

stor

to D X N

ADD

Address Input. Sets device slave address. Connect to GND, V

, 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 V

. Open circuit when V

SDA

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

. Open

circuit when V

= 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 oint.

Pin Description

Typical Operating Characteristics (continued)

= 3.3V, T

= +25癈.)

PWMOUT FREQUENCY

vs. DIE TEMPERATUREt

TEMPERATURE (癈)

-15

-40

110

PWMOUT FREQUENCY

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

5.0

4.5

4.0

3.5

3.0

5.5

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