HAL800

Due to the sensor's versatile programming characteristics,the HAL 800 is the optimal system solution for applications such as:
contactless potentiometers,
rotary position measurement,
linear position detection,
magnetic field and current measurement

The HAL800 is a monolithic integrated circuit which provides an output voltage proportional to the magnetic flux through the Hall plate and proportional to the supply voltage.

The HAL800 external magnetic field component perpendicular to the branded side of the package generates a Hall voltage. This voltage is converted to a digital value, processed in the Digital Signal Processing Unit (DSP) according to the EEPROM programming, converted to an analog voltage with ratiometric behavior, and stabilized by a push-pull output transistor stage. The function and the parameters for the DSP are detailed explained in Section 2.2. on page 7.

The setting of the LOCK register disables the programming of the EEPROM memory for all time. This HAL800 register cannot be reset.

As long as the LOCK register is not set, the output characteristic can be adjusted by modifying the EEPROM registers. The HAL800 IC is addressed by modulating the supply voltage (see Fig. 21). In the supply voltage range from 4.5 V up to 5.5 V, the sensor generates an analog output voltage. After detecting a command,the sensor reads or writes the memory and answers with a digital signal on the output pin. The analog output is switched off during the communication.

Internal temperature compensation circuitry and the choppered offset compensation enables operation over the full temperature range with minimal changes in accuracy and high offset stability. The circuitry also rejects offset shifts due to mechanical stress from the package. The non-volatile memory is equipped with redundant EEPROM cells. In addition, the HAL800 sensor IC is equipped with devices for overvoltage and reverse voltage protection at all pins.