Multiple Channel 1°C Temperature Sensors with Beta Compensation
Datasheet
Chapter 8 Typical Operating Curves
Temperature Error vs. Ambient Temperature
(2N3904, TDIODE = 42.5°C, VDD = 3.3V)
Temperature Error vs. Filter Capacitor
(2N3904, TA = 27°C, TDIODE = 27°C, VDD = 3.3V)
1.0
0.8
1.0
0.8
0.6
0.5
0.4
0.3
0.2
0.0
0.0
-0.3
-0.5
-0.8
-1.0
-0.2
-0.4
-0.6
-0.8
-1.0
0
1000
2000
3000
4000
Filter Capacitor (pF)
-40 -25 -10
5
20 35 50 65 80 95 110 125
Ambient Temperature (°C)
Temperature Error vs. CPUTemperature
Typical 65nm CPUfrom major vendor
Temperature Error vs. External Diode Temperature
(2N3904, TA = 42.5°C, VDD = 3.3V)
(TA = 27°C, VDD= 3.3V, BETA = 011, CFILTER = 470pF)
1.0
0.8
5
4
3
0.6
Beta Compensation
Disabled
0.4
0.2
2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
1
0
Beta Compensation Enabled
-1
20
40
60
80
100
120
-40 -25 -10
5
20 35 50 65 80 95 110 125
CPU Temperature (°C)
External Diode Temperature (°C)
Revision 1.41 (02-23-12)
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