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S-5843AA0CA-M5T1U Datasheet(PDF) 9 Page - Seiko Instruments Inc |
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S-5843AA0CA-M5T1U Datasheet(HTML) 9 Page - Seiko Instruments Inc |
9 / 21 page TEMPERATURE SWITCH IC (THERMOSTAT IC) Rev.2.2_01 S-5843A Series 9 Operation 1. Basic operation The S-5843A 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-5843A Series starts to detect the temperature. If the temperature is lower than the detection temperature ( +TD), the DET pin output keeps "L". The temperature rises and exceeds the detection temperature, the DET pin output is set to "H". After the detection, the temperature drops and reaches the release temperature ( +TD − THYS), the DET pin output returns to "L". Figure 7 is the timing chart. L DET pin output Ambient temperature (Ta) H Detection temperature ( TD) Hysteresis temperature (THYS) Figure 7 Operation when DET Pin Output Logic is Active "H" 2. Prevention functions for false detection operation and false release operation The S-5843A Series sets the start-up control sequence and the noise suppression time (tdelay) via the delay circuit. By this, the S-5843A Series prevents false detection and false release operations which are caused by start-up and power supply fluctuation. Following is about the operation when the DET pin output logic is active "H". 2. 1 Operation at start-up By the start-up control sequence, the S-5843A Series fixes the DET pin output "L" until the internal circuits become stable immediately after start-up. After that, the S-5843A Series starts the operation for temperature detection. The DET pin output keeps "L" if ambient temperature (Ta) is the detection temperature ( +TD) or less. After that, if the temperature rises and exceeds the detection temperature, and this status is held for the noise suppression time or longer, the DET pin output is set to "H". 2. 2 Operation at power supply fluctuation The DET pin output is set to "L", if ambient temperature is the detection temperature or less. If any power supply fluctuation makes the internal circuit unstable, this status lasts shorter than the noise suppression time, the DET pin output is not set to "H". Thus, false detection operation by power supply fluctuation can be prevented. This is as well for the release operation. |
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