HAL815AUT-A.pdf

Introduction The HAL 815 is a new member of the Micronas family of programmable linear Hall sensors. As an extension to the HAL 800, it offers open-circuit, as well as overvoltage and undervoltage detection and individual programming of different sensors which are in parallel to the same supply voltage. The HAL 815 is an universal magnetic field sensor with a linear output based on the Hall effect. The IC is designed and produced in sub-micron CMOS technology and can be used for angle or distance measurements if combined with a rotating or moving magnet. The major characteristics like magnetic field range, sensitivity, output quiescent voltage (output voltage at B = 0 mT), and output voltage range are programmable in a non-volatile memory. The sensor has a ratiometric output characteristic, which means that the output voltage is proportional to the magnetic flux and the supply voltage. The HAL 815 features a temperature-compensated Hall plate with choppered offset compensation, an A/D converter, digital signal processing, a D/A converter with output driver, an EEPROM memory with redundancy and lock function for the calibration data, a serial interface for programming the EEPROM, and protection devices at all pins. The internal digital signal processing is of great benefit because analog offsets, temperature shifts, and mechanical stress do not degrade the sensor accuracy.

. Major Applications Due to the sensor’s versatile programming characteristics, the HAL 815 is the optimal system solution for applications such as: – contactless potentiometers, – angle sensors, – distance measurements, – magnetic field and current measurement. 1.2. Features – high-precision linear Hall effect sensor with ratiometric output and digital signal processing – multiple programmable magnetic characteristics in a non-volatile memory (EEPROM) with redundancy and lock function – open-circuit (ground and supply line break detection), overvoltage and undervoltage detection – for programming an individual sensor within several sensors in parallel to the same supply voltage, a selection can be done via the output pin – to enable programming of an individual sensor amongst several sensors running parallel to the same supply voltage, each sensor can be selected via its output pin – temperature characteristics are programmable for matching all common magnetic materials – programmable clamping function – programming through a modulation of the supply voltage – operates from −40 °C up to 150 °C ambient temperature – operates from 4.5 V up to 5.5 V supply voltage in specification and functions up to 8.5 V – total error < 2.0% over operating voltage range and temperature range – operates with static magnetic fields and dynamic magnetic fields up to 2 kHz – overvoltage and reverse-voltage protection at all pins – magnetic characteristics extremely robust against mechanical stress – short-circuit protected push-pull output – EMC and ESD optimized design