RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown
Datasheet
Tachometer Measurement Accuracy vs.
Temperature
0.5
Temperature Measurement Error vs. Supply
Voltage
0.5
0.4
0.3
0.2
0.1
0
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.1
-0.2
-0.3
-0.4
-0.5
2.95
3.05
3.15
3.25
3.35
3.45
3.55
3.65
-50
0
50
100
150
Ambient Temperature (°C)
Supply voltage (V)
PWM Output Drive Frequency
Variation vs. Ambient Temperature
Tachometer Measurement Accuracy
vs. Supply Voltage
1.4
1.2
1
0.5
0.4
0.3
0.2
0.1
0
Base = 26kHz, Divide = 0
Base = 2441Hz, Divide =
128 = 19Hz
0.8
0.6
0.4
0.2
0
-0.1
-0.2
-0.3
-0.4
-0.5
-50
0
50
100
150
2.95
3.05
3.15
3.25
3.35
3.45
3.55
3.65
Supply Voltage (V)
Ambient Temperature (°C)
Revision 1.2 (10-08-09)
SMSC EMC2113
DATA7S4HEET
SMSC [ SMSC CORPORATION ]
