User guide

MAX1669
Fan Controller and Remote Temperature Sensor
with SMBus Serial Interface
_______________________________________________________________________________________ 5
40
-30
1 10 100
TEMPERATURE ERROR
vs. LEAKAGE RESISTANCE
-10
MAX1669-01
LEAKAGE RESISTANCE (M
Ω
)
TEMPERATURE ERROR (°C)
10
30
-40
-20
0
20
PATH = DXP TO V
CC
(5V); CONFIG = 02h
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 60 100-40 400 80 120 140
TEMPERATURE ERROR
vs. REMOTE DIODE TEMPERATURE
MAX1669-02
TEMPERATURE (°C)
TEMPERATURE ERROR (°C)
RANDOM 2N3906s FROM
DIFFERENT MANUFACTURERS
18
-2
1K 10K 100K 1M 10M 100M
TEMPERATURE ERROR vs.
POWER-SUPPLY NOISE FREQUENCY
2
0
MAX1669-03
PSNF (Hz)
TEMPERATURE ERROR (°C)
6
14
10
4
8
16
12
V
IN
= SQUARE WAVE APPLIED TO
V
CC
WITH NO 0.1µF V
CC
CAPACITOR
V
IN
= 100mVp-p
V
IN
= 250mVp-p
7
-2
1M 1G100M10M
TEMPERATURE ERROR vs.
COMMON-MODE NOISE FREQUENCY
1
-1
5
3
8
2
0
6
4
MAX1669-04
FREQUENCY (Hz)
TEMPERATURE ERROR (°C)
V
IN
= 50mVp-p AC-COUPLED TO DXN
C = DXN - DXP CAPACITANCE
C = 27nF
C = 2200pF
-16
-12
-14
-6
-8
-10
0
-2
-4
2
02010 30 40 50
TEMPERATURE ERROR
vs. DXP - DXN CAPACITANCE
MAX1669-05
DXP-DXN CAPACITANCE (nF)
TEMPERATURE ERROR (°C)
V
CC
= 5V
0
2
1
4
3
6
5
7
3.0 4.03.5 4.5 5.0 5.5
STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1669-06
SUPPLY VOLTAGE (V)
STANDBY SUPPLY CURRENT (µA)
0
40
20
80
60
100
120
-2 2 406810
RESPONSE TO THERMAL SHOCK
MAX1669-07
TIME (sec)
TEMPERATURE (°C)
CMPT3906 IMMERSED IN
+115°C FLUORINERT BATH
0
20
60
40
80
120
100
140
160
180
042 5 7 8 10 123169111314
PWM FREQUENCY vs. CODE (F3F2F1F0)
MAX1669-08
CODE (F3F2F1F0)
PWM FREQUENCY (Hz)
V
CC
= +3.3V
V
CC
= +5V
Typical Operating Characteristics
(Temperature error = measured - actual, T
A
= +25°C, unless otherwise noted.)