S-5841A55D-M5T1X Datasheet, PDF (13/26 Pages) Seiko Instruments Inc – TEMPERATURE SWITCH IC

Rev.2.2_01
TEMPERATURE SWITCH IC (THERMOSTAT IC)
S-5841 Series
 Operation
1. Basic operation
The S-5841 Series is a temperature switch IC (thermostat IC) which detects a certain temperature and sends a signal to
an external device. Various combinations of the parameters such as the detection temperature, output form and output
logic can be selected.
Following is about the operation when the DET pin output logic is active "H".
After applying the power supply, the S-5841 Series starts to detect the temperature. If it is lower than the detection
temperature (+TD), the DET pin output keeps "L". The temperature rises and exceeds the detection temperature, the
DET pin is set to "H".
After the detection, the temperature drops and reaches the release temperature (+TD − THYS), the DET pin returns to "L".
Figure 8 is the timing chart.
Hysteresis temperature
(THYS)
Ambient temperature (Ta)
Detection temperature (TD)
H
DET pin output
L
Figure 8 Operation when DET Pin Output Logic is Active "H"
2. Hysteresis setting
2. 1 SOT-23-5
The hysteresis temperature can be set by the HYS1 pin. By option, the hysteresis temperature of the product is
selectable in 2°C and 10°C / 4°C and 10°C.
Table 12 Hysteresis Option A
Setting Pin
HYS1
"H"
"L"
Hysteresis Temperature
2°C
10°C
Table 13 Hysteresis Option B
Setting Pin
HYS1
"H"
"L"
Hysteresis Temperature
4°C
10°C
13