3500/42M | BENTLY | Integrated temperature controller

Description

3500/42M | BENTLY | Integrated temperature controller

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3500/42M is an integrated, low-cost dual remote temperature controller launched by National Semiconductor Corporation (NSC) in the United States. It contains a remote temperature sensor selector, ∑ – △ A/D converter, threshold temperature setter, digital comparator, control signal circuit, and output circuit inside. In addition, there are three open drain digital signal output terminals. Used for temperature control. This device uses the emission junction of an external low-power crystal transistor as a remote temperature sensor. When the measured temperature exceeds the pre-set threshold temperature value, the digital signal output terminal will output the corresponding logic level, and then the temperature is controlled through the driving circuit. LM88 has a temperature hysteresis characteristic, and its hysteresis is set by the manufacturer before leaving the factory to avoid frequent action of the actuator near the temperature control point. This integrated temperature controller is powered by a+2.8~+3.8 V power supply, with a power current of 1.5 mA. Therefore, it has the characteristics of low power supply and micro power consumption, and can be widely used in household appliances, office equipment, data acquisition systems, battery power supply systems, industrial process control, cooling fan control, and overheating protection of electrical equipment.

The remote temperature sensor inside the 3500/42M first converts the perceived temperature into a voltage signal, and then sends it to the ∑ – △ A/D converter through the remote temperature sensor selector. The converted output is sent to the digital comparators A1, A2, and A3, respectively. Then, it is compared with the digital quantities corresponding to the threshold temperature output by the three threshold temperature setters. Finally, the comparison result is output in the corresponding logic level form. The comparator can be set to be greater than or less than the comparison before leaving the factory, when set to be greater than the comparison. If the temperature detected by temperature sensor D0 exceeds the temperature set by the T-SP0 threshold temperature setter, A1 outputs a high level, the driver output circuit conducts, and O-SP0 outputs a low level. Similarly, if the temperature detected by temperature sensor D1 exceeds the temperature set by the T-SP1 threshold temperature setter, the O-SP1 output is at a low level. When the temperature detected by D0 or D1 exceeds the temperature set by the T-CRIT threshold temperature setter, A3 outputs a high level, drives the output circuit to conduct, and O-CRIT outputs a low level. The working timing waveform is shown in Figure 3. The principle of setting it to be smaller than the comparison is similar. All comparators of LM88 have hysteresis characteristics, with hysteresis temperature set to 1 ℃. The T-CRIT threshold temperature setter is set within the range of -40 ℃ to+125 ℃, with a threshold interval of 1 ℃ and a threshold interval of 4 ℃ for T-SP0 and T-SP1.

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