TMP300_15 Datasheet, PDF (8/18 Pages) Texas Instruments – 1.8V, Resistor-Programmable TEMPERATURE SWITCH and ANALOG OUT TEMPERATURE SENSOR in SC70

TMP300
SBOS335C – JUNE 2005 – REVISED JANUARY 2011
HYSTERESIS
The hysteresis pin has two settings. Grounding
HYST_SET results in 5°C of hysteresis. Connecting it to
V_S results in 10°C of hysteresis. Hysteresis error
variation over temperature is shown in Figure 12 and
Figure 13.
5
4
3
2
Maximum
1
0
-1
Average Minimum
-2
-3
-4
-5
-50 -25
0
25
50
75
Temperature (°C)
100 125
Figure 12. 5°C Hysteresis Error vs Temperature
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Bypass capacitors should be used on the supplies as
well as on the R_SET and analog out (V_TEMP) pins when
in noisy environments, as shown in Figure 14. These
capacitors reduce premature triggering of the
comparator.
5
4
3
2
Maximum
1
0
-1
Average Minimum
-2
-3
-4
-5
-50 -25
0
25
50
75
Temperature (°C)
100 125
Figure 13. 10°C Hysteresis Error vs Temperature
V+
C_BYPASS
C_BYPASS
V_TEMP
T_SET
3mA
R_SET
TMP300
Proportional
to T_A
210kW
HYST_SET
OUT _{Open-Drain Control}
Figure 14. Bypass Capacitors Prevent Early Comparator Toggling Due to Circuit Board Noise
8
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