Fan Controller and Remote Temperature Sensor

with SMBus Serial Interface

_______________________________________________________________________________________

5

40

-30

1

10

100

TEMPERATURE ERROR

vs. LEAKAGE RESISTANCE

-10

LEAKAGE RESISTANCE (M

Ω)

10

30

-40

-20

0

20

PATH = DXP TO GND; CONFIG = 02h

-2.0

-1.0

-1.5

0.5

0

-0.5

1.5

1.0

2.0

-60

20

-20

60

100

-40

40

0

80

120 140

TEMPERATURE ERROR

vs. REMOTE DIODE TEMPERATURE

TEMPERATURE (°C)

RANDOM 2N3906s FROM

DIFFERENT MANUFACTURERS

18

-2

1K

10K

100K

1M

10M

100M

TEMPERATURE ERROR vs.

POWER-SUPPLY NOISE FREQUENCY

2

0

PSNF (Hz)

6

14

10

4

8

16

12

7

-2

1M

1G

100M

10M

TEMPERATURE ERROR vs.

COMMON-MODE NOISE FREQUENCY

1

-1

5

3

8

2

0

6

4

FREQUENCY (Hz)

C = DXN - DXP CAPACITANCE

C = 27nF

C = 2200pF

-16

-12

-14

-6

-8

-10

0

-2

-4

2

020

10

30

40

50

TEMPERATURE ERROR

vs. DXP - DXN CAPACITANCE

DXP-DXN CAPACITANCE (nF)

0

2

1

4

3

6

5

7

3.0

4.0

3.5

4.5

5.0

5.5

STANDBY SUPPLY CURRENT

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

0

40

20

80

60

100

120

-2

2

4

06

8

10

RESPONSE TO THERMAL SHOCK

TIME (sec)

CMPT3906 IMMERSED IN

+115°C FLUORINERT BATH

0

20

60

40

80

120

100

140

160

180

04

2

5

7 8

10

12

3

16

9

11

13 14

PWM FREQUENCY vs. CODE (F3F2F1F0)

CODE (F3F2F1F0)

Typical Operating Characteristics