HAL1820UA-A Sensors, Transducers

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Magnetic sensors are a type of electronics that detect and measure the presence, size, or changes in a magnetic field. Linear, compass (ICs), and HAL1820UA-A are among them. In this article, the application field and working principle of the HAL1820UA-A will be discussed in detail.

Background

The HAL1820UA-A is a part of the HAL family of magneto-resistive sensor ICs from Honeywell. It is a bidirectional current sensor IC that can be used to measure the current in two directions (CCW and CW). The device is specially designed for applications in harsh environments, such as automotive, industrial, and appliance control. This device is rugged and highly reliable.

Application

HAL1820UA-A can be used in a variety of applications, such as automotive power steering, automotive engine control and monitoring, current and energy monitoring, and motor start/stop systems. It can measure currents up to 200A (peak). The wide operating temperature range of -40°C to 125°C makes the device suitable for a wide range of applications.

It can be used for over-current protection and monitoring, DC-to-DC converters, instrumentation, appliance control, and motor control systems. It is used in automotive applications, such as anti-lock braking, ignition systems, and airbags.

Working Principle

HAL1820UA-A works on the principle of magneto-resistance. It uses a thin magneto-resistive element that is sensitive to the magnetic field generated by the current. The device is calibrated at the factory to detect the change in resistance when exposed to the varying magnetic fields.

When the magnetic field increases, the resistance in the magneto-resistant element increases. The device then detects the change in resistance and sends a signal to the microcontroller, which can then take appropriate action. The microcontroller then converts this signal into a digital value, which can be read by a processor.

HAL1820UA-A also uses a Hall-effect transducer to measure the field generated by the current. The device reads the current by calculating the rate of change in the magnetic field. The device then converts this data into a digital signal, which can be read by a processor.

HAL1820UA-A also includes a range of features to make it user-friendly. It has a short circuit protection feature to protect against over-currents and a self-shielding feature to reduce interference from external magnetic fields.

In addition, the device supports two levels of diagnostics. It can detect changes in current rate and the device can generate an alarm if an over-current or short circuit condition occurs.

HAL1820UA-A is also very reliable and long-lasting. It has a rated lifetime of up to 10 million hours, making it suitable for harsh environments. The device is also RoHS compliant, making it environmentally friendly.

Conclusion

In summary, HAL1820UA-A is a robust magneto-resistive current sensor IC that provides excellent performance in harsh environments. Its wide operating temperature range and range of features make it suitable for a variety of applications. It is also reliable and long-lasting, making it a great choice for automotive, industrial, and appliance control applications.

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