Integrated temperature controller LM88 and its application - Power Circuit - Circuit Diagram

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The LM88 is an integrated, low-cost, dual-remote temperature controller from National Semiconductor Corporation (NSC). It contains a remote temperature sensor selector, ∑-Δ A/D converter, threshold temperature setter, digital comparator, control signal circuit and output circuit. There are also three open-drain digital signal outputs. Used as a temperature control. The device uses the emitter junction of an external low-power crystal transistor as a remote temperature sensor. When the measured temperature crosses a preset threshold temperature value, the digital signal output terminal outputs a corresponding logic level, and then passes through the driving circuit. To achieve temperature control. The LM88 has a temperature hysteresis characteristic, and the hysteresis is set by the manufacturer before leaving the factory to avoid frequent movement of the actuator near the temperature control point. When the integrated temperature controller is powered by +2.8 to +3.8 V, the supply current is 1.5 mA, so it has low power and micro power consumption. It can be widely used in household appliances, office equipment, data acquisition systems, and battery-powered systems. , industrial process control, cooling fan control, overheat protection of electrical equipment and other fields.

1 pin function and internal structure

The LM88 is packaged in MSOP-8. The pinouts are shown in Figure 1. The functions of each pin are listed in Table 1.


4 Conclusion

The design uses a dual remote temperature sensor with integrated temperature controller LM88 to achieve temperature monitoring of two remote units. Moreover, this simple-use temperature control circuit is designed by using the comparison method and the threshold temperature setting value that have been set before leaving the factory. Therefore, the integrated temperature controller LM88 will be widely used in temperature monitoring with its simple and practical, low power consumption and other excellent performance and low price.