S-5844A50DB-M5T1U3 Datasheet, PDF (11/28 Pages) Seiko Instruments Inc – TEMPERATURE SWITCH IC

Rev.2.6_01
 Operation
TEMPERATURE SWITCH IC (THERMOSTAT IC)
S-5844A Series
The S-5844A Series is a temperature switch IC (thermostat IC) which detects temperature and sends a signal to an
external device.
The users can select various combinations of the parameters such as the detection temperature, the output form and logic,
and hysteresis temperature.
Following is about the operation when the DET pin output logic is active "H".
After applying the power supply, the S-5844A Series starts to detect the temperature. If the temperature is lower than the
detection temperature (+TD), the DET pin output keeps "L". After that, the temperature rises and exceeds the detection
temperature, and the DET pin goes in "H".
After the detection, the temperature drops and reaches the release temperature (+TD − THYS), the DET pin output returns to
"L".
Figure 10 is the timing chart.
Hysteresis temperature
(THYS)
Ambient temperature (Ta)
Detection temperature (TD)
Release temperature (TD − THYS)
H
DET pin output
L

Figure 10 Operation when the DET Pin Output Logic is Active "H"
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