TEMPERATURE SWITCH IC (THERMOSTAT IC)

S-5841 Series

Seiko Instruments Inc.

13



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 (

DET pin is set to "H".

After the detection, the temperature drops and reaches the release temperature (

Figure 8 is the timing chart.

L

DET pin output

Ambient temperature (Ta)

H

Detection temperature (

Hysteresis temperature

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

Hysteresis Temperature

HYS1

"H"

2

°C

"L"

10

°C

Table 13 Hysteresis Option B

Setting Pin

Hysteresis Temperature

HYS1

"H"

4

°C

"L"

10

°C