MAX1669 Datasheet, PDF (5/20 Pages) Maxim Integrated Products – Fan Controller and Remote Temperature Sensor with SMBus Serial Interface

Fan Controller and Remote Temperature Sensor
with SMBus Serial Interface
Typical Operating Characteristics
(Temperature error = measured - actual, T_A = +25°C, unless otherwise noted.)
TEMPERATURE ERROR
vs. LEAKAGE RESISTANCE
40
30
20
PATH = DXP TO GND; CONFIG = 02h
10
0
-10
-20
PATH = DXP TO V_CC (5V); CONFIG = 02h
-30
-40
1
10
100
LEAKAGE RESISTANCE (MΩ)
TEMPERATURE ERROR vs.
COMMON-MODE NOISE FREQUENCY
8
7
V_IN = 50mVp-p AC-COUPLED TO DXN
C = DXN - DXP CAPACITANCE
6
5
C = 2200pF
4
3
C = 27nF
2
1
0
-1
-2
1M
10M
100M
1G
FREQUENCY (Hz)
TEMPERATURE ERROR
vs. REMOTE DIODE TEMPERATURE
2.0
RANDOM 2N3906s FROM
1.5 DIFFERENT MANUFACTURERS
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
TEMPERATURE ERROR
vs. DXP - DXN CAPACITANCE
2
V_CC = 5V
0
-2
-4
-6
-8
-10
-12
-14
-16
0
10
20
30
40
50
DXP-DXN CAPACITANCE (nF)
TEMPERATURE ERROR vs.
POWER-SUPPLY NOISE FREQUENCY
18
16
V_IN = SQUARE WAVE APPLIED TO
V_CC WITH NO 0.1µF V_CC CAPACITOR
14
12
10
V_IN = 250mVp-p
8
6
4
V_IN = 100mVp-p
2
0
-2
1K
10K 100K 1M
PSNF (Hz)
10M 100M
STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
7
6
5
4
3
2
1
0
3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
RESPONSE TO THERMAL SHOCK
120
100
80
60
40
20
CMPT3906 IMMERSED IN
+115°C FLUORINERT BATH
0
-2 0 2 4 6 8 10
TIME (sec)
PWM FREQUENCY vs. CODE (F3F2F1F0)
180
160
140
V_CC = +5V
120
100
V_CC = +3.3V
80
60
40
20
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
CODE (F3F2F1F0)
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