MAX6639(2005) Просмотр технического описания (PDF) - Maxim Integrated

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производитель

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

Typical Operating Circuit

5V

VFAN

(5V OR 12V)

3.3V TO 5.5V

5V

CPU

DXP1 VCC ADD TACH1

VFAN

(5V OR 12V)

DXN

PWM1

5V

DXP2

PWM2

MAX6639

3.3V TO 5.5V

GPU

TO SMBus

SDA

MASTER

SCL

3.3V TO 5.5V

TACH2

3.3V TO 5.5V

ALERT

3.3V TO 5.5V

OT

TO SYSTEM SHUTDOWN

3.3V TO 5.5V

TO CLOCK THROTTLE

THERM

FANFAIL

GND

near high-voltage traces is no longer an issue.

5) Route as few vias and crossunders as possible to

minimize copper/solder thermocouple effects.

6) When introducing a thermocouple, make sure that

both the DXP and the DXN paths have matching

thermocouples. In general, PC board-induced ther-

mocouples are not a serious problem. A copper

solder thermocouple exhibits 3µV/°C, and it takes

approximately 200µV of voltage error at DXP/DXN

to cause a +1°C measurement error, so most para-

sitic thermocouple errors are swamped out.

7) Use wide traces. Narrow traces are more inductive

and tend to pick up radiated noise. The 10-mil widths

and spacings recommended are not absolutely nec-

essary (as they offer only a minor improvement in

leakage and noise), but use them where practical.

8) Placing an electrically clean copper ground plane

between the DXP/DXN traces and traces carrying

high-frequency noise signals helps reduce EMI.

Chip Information

TRANSISTOR COUNT: 39,283

PROCESS: BiCMOS

20 ______________________________________________________________________________________

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