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138908597 UNPDF
thermostat I
037
2V7...5V5
MAX6501
100n
V
CC
OUT 5
4
OUT
1
Hyst. = 10
C
IC1
T TH
MAX650X
3
5
TEMP
HYST
OUT
Hyst. = 2
C
MAX650X
1
2
3
5
4
MAX6502
V
CC
1
2
OUT 5
OUT
T TH
TEMP
G. Kleine
The MAX6501–MAX6504 integrated circuits contain a thermo-
stat with fixed temperature thresholds. Available are thresholds
of –15 °C, +5 °C, +45 °C, +55 °C, +65 °C, +75 °C, +85 °C, and
+95
MAX6503
V
CC
OUT 5
OUT
C. The MAX6501 and MAX6502 are for use over the tem-
perature range +35 °C to +115 °C, while the MAX6503 and
MAX6504 can be programmed from –45
T TH
TEMP
C.
The tiny circuit, terminated in a 5-pin SOT-23-SMD case is ide-
ally suited for building into an existing appliance. The supply volt-
age may be 2.7–5.5 V. The HYST input allows a hysteresis of 2 °C
(HYST=GND) or 10
°
C to +15
°
MAX6504
V
CC
C (HYST=V CC ) to be selected.
The difference between the four ICs is only in their output con-
figuration. The MAX6501 and MAX6503 have open-drain out-
puts that need a pull-up resistor, whereas the MAX6502 and
MAX6504 have a push-pull output that can gate GND or V CC . At
high temperatures, the MAX6501 and MAX6504 gate to ground,
whereas the other two link the output to V CC .
Further information about these useful circuits may be had
from http://www.maxim-ic.com
°
OUT 5
OUT
T TH
TEMP
994037 - 11
[994037]
°
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