EMC1422_12 Datasheet, PDF (37/41 Pages) SMSC Corporation – 1°C Temperature Sensor with Hardware Thermal Shutdown

1°C Temperature Sensor with Hardware Thermal Shutdown
Datasheet
Chapter 7 Typical Operating Curves
Tem perature Error vs. Filter Capacitor
(2N3904, TA = 27°C, T_DIODE = 27°C, VDD = 3.3V)
1.0
0.8
0.5
0.3
0.0
-0.3
-0.5
-0.8
-1.0
0
1000
2000
3000
Filter Capacitor (pF)
4000
Tem perature Error vs. External Diode Tem perature
(2N3904, TA = 42.5°C, VDD = 3.3V)
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-40 -25 -10 5 20 35 50 65 80 95 110 125
External Diode Tem perature (°C)
Tem perature Error vs. Am bient Tem perature
(2N3904, T_DIODE = 42.5°C, VDD = 3.3V)
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-40 -25 -10 5 20 35 50 65 80
Am bient Tem perature (°C)
95 110 125
Temperature Error vs. CPU Temperature
Typical 65nm CPU from major vendor
5
(TA = 27°C, VDD = 3.3V, BETA = 011, C_FILTER = 470pF)
4
Beta Compensation
3
Disabled
2
1
0
Beta Compensation Enabled
-1
20
40
60
80
100
120
CPU Temperature (°C)
SMSC EMC1422
37
DATASHEET
Revision 2.0 (08-10-12)