The HAL 824 and the HAL 825 complement the existing Hall-effect sensor family HAL 8xy. Both high-precision magnetic field sensors provide a ratiometric, linear output signal. This sensor family is designed to fulfill high requirements in respect of low temperature drifts of sensitivity and offset.

Due to the very low drifts of this sensor family, it can be used for applications with very high requirements on offset and sensitivity drift stability. This is mandatory for applications like throttle position detection, accelerator pedal sensing, or current measurement.

The sensors provide either a ratiometric analog output signal or a multiplexed analog output. In multiplex analog output mode, the sensor transmits LSN and MSN of the output value separately. This enables the sensor to transmit a signal with 14-bit accuracy.

Major characteristics like magnetic field range, output format, sensitivity, VOQ (output voltage at zero magnetic field), and the temperature coefficients can easily be adjusted to the magnetic circuit (linear and quadratic) by programming the non-volatile memory.

Both sensors are available in the very small leaded package TO-92UT.

System Architecture

Block diagram of the HAL 82x

Main Features

Sensitivity drift over temperature less than ±1% (HAL 825 less than ±2%)

Offset drift over temperature less than ±0.2% (HAL 825 less than ±0.3%) of VDD

DNL of analog output ±0.9 LSB (±2 LSB for HAL 825)

Wire Break Detection with 5 kΩ pull-up or pull-down resistor

Four programmable magnetic ranges: ±30, ±60, ±80, and ±100 mT

Two programmable 3 dB filter frequencies: 500 Hz and 1 kHz

Programmable sensitivity and offset (VOQ)

12-bit ratiometric analog output

14-bit signal path

Digital signal processing

Temperature characteristics program-mable to match all common magnetic materials

52 customer data bits

Programming by 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

Magnetic characteristics extremely robust against mechanical stress

Major Applications

Due to the sensor’s versatile programming characteristics and low drifts, the HAL 82x is the optimal system solution for applications such as:

Contactless potentiometers

Rotary position measurement, like throttle position or accelerator pedal

Linear movement

Current measurements

Development Tools

Micronas programmer board (hardware version 5.x)

Visual Basic® programming software for Windows® 9x/2000/XP

Visual Basic source code

Development tool setup