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MAX6639 Datasheet(PDF) 20 Page - Maxim Integrated Products

Part No. MAX6639
Description  2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX6639 Datasheet(HTML) 20 Page - Maxim Integrated Products

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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.
2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
20
______________________________________________________________________________________
MAX6639
VFAN
(5V OR 12V)
SDA
SCL
PWM2
DXP1
DXN
TO CLOCK THROTTLE
TO SYSTEM SHUTDOWN
TO SMBus
MASTER
3.3V TO 5.5V
3.3V TO 5.5V
3.3V TO 5.5V
3.3V TO 5.5V
3.3V TO 5.5V
3.3V TO 5.5V
PWM1
5V
5V
DXP2
GPU
VCC
CPU
GND
5V
TACH1
ADD
TACH2
ALERT
THERM
FANFAIL
VFAN
(5V OR 12V)
OT
Typical Operating Circuit
Chip Information
TRANSISTOR COUNT: 39,283
PROCESS: BiCMOS


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