S-5842AAAAF-M6T1Y Datasheet, PDF (14/31 Pages) Seiko Instruments Inc – DUAL TRIP TEMPERATURE SWITCH IC

DUAL TRIP TEMPERATURE SWITCH IC (THERMOSTAT IC)
S-5842A Series
Rev.2.3_01
 Operation
1. Separate type
The followings are the operation with its specs when the S-5842A Series is Separate type. The timing chart is shown in
Figure 11.
• Output form and type: CMOS output, Separate type
• Option
: DETH pin
Detection temperature
Hysteresis temperature
Output logic
DETL pin
Detection temperature
Hysteresis temperature
Output logic
TDH = +95°C
THYSH = −5°C
"H"
TDL = +55°C
THYSL = −5°C
"H"
(1) (2)
(3)
(4) (5)
Detection temperature (T_DH = +95°C)
Difference of detection temperature
(ΔT_D = +40°C)
Detection temperature (T_DL = +55°C)
Ambient temperature (Ta)
Hysteresis temperature
(T_HYSH = −5°C)
Hysteresis temperature
(T_HYSL = −5°C)
H
DETH pin output
(Output logic "H")
L
H
DETL pin output
(Output logic "H")
L
Figure 11 Timing Chart for CMOS Output and Separate Type
Detecting the temperature is started after power-on.
In case;
(1) Ambient temperature (Ta) < detection temperature (TDL = +55°C)
The DETH pin output and the DETL pin output keep "L".
(2) The ambient temperature (Ta) rises;
detection temperature (TDL = +55°C) < ambient temperature (Ta) < detection temperature (TDH = +95°C)
The DETH pin output keeps "L", the DETL pin output gets "H".
(3) Furthermore, the ambient temperature (Ta) rises;
ambient temperature (Ta) > detection temperature (TDH = +95°C)
The DETL pin output keeps "H", the DETH pin output gets "H".
(4) After that, the ambient temperature (Ta) falls;
release temperature (TDH + THYSH = +90°C) > ambient temperature (Ta) > release temperature (TDL + THYSL = +50°C)
The DETH pin output gets "L", the DETL pin output keeps "H".
(5) Furthermore the ambient temperature (Ta) falls;
ambient temperature (Ta) < release temperature (TDL + THYSL = +50°C)
The DETH pin output keeps "L", the DETL pin output gets "L".
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