HAL300

distance between Hall plates: 2.05 mm
operates from 4.5 V to 24 V supply voltage
switching offset compensation at 62 kHz
overvoltage protection
reverse-voltage protection at VDD-pin
short-circuit protected open-drain output by thermal shutdown
operates with magnetic fields from DC to 10 kHz
output turns low with magnetic south pole on branded side of package and with a higher magnetic flux density in sensitive area S1 as in S2
on-chip temperature compensation circuitry minimizes shifts of the magnetic parameters over temperature and supply voltage range
the decrease of magnetic flux density caused by rising temperature in the sensor system is compensated by a built-in negative temperature coefficient of hysteresis
EMC corresponding to DIN 40839

Mechanical stress can change the sensitivity of the Hall plates and an offset of the magnetic switching points may result. External mechanical stress to the package can influence the magnetic parameters if the sensor is used under back-biased applications. This piezo sensitivity of the sensor IC cannot be completely compensated for by the switching offset compensation technique. For back-biased applications, the HAL320 is recommended. In such cases, please contact our Application Department. They will provide assistance in avoiding applications which may induce stress to the ICs. This stress may cause drifts of the magnetic parameters indicated in this data sheet.

For electromagnetic immunity, it is recommended to apply a 4.7 nF capacitor between V_DD (pin 1) and Ground (pin 2). For automotive applications, a 220  series resistor to pin 1 is recommended. Because of the I_DD peak at 4.1 V, the series resistor should not be greater than 270 . The series resistor and the capacitor should be placed as close as possible to the IC.

1) as long as T_Jmax is not exceeded
2) with a 220 series resistance at pin 1 corresponding to test circuit 1
3) t<2 ms
4) t<1000h

The HAL300 is a differential Hall switch produced in CMOS technology. The sensor includes 2 temperature compensated Hall plates (2.05 mm apart) with active offset compensation, a differential amplifier with a Schmitt trigger, and an open-drain output transistor (see Fig. 2).

The HAL300 is a differential sensor which responds to spatial differences of the magnetic field. The Hall voltages at the two Hall plates, S1 and S2, are amplified with a differential amplifier. The differential signal is compared with the actual switching level of the internal Schmitt trigger. Accordingly, the output transistor is switched on or off. The sensor has a bipolar switching behavior and requires positive and negative values of B = B_S1 B_S2 for correct operation.

The HAL300 is an ideal sensor for applications with a rotating multi-pole-ring in front of the branded side of the package (see Fig. 4 and Fig. 5), such as ignition timing, anti-lock brake systems, and revolution counting. For applications in which a magnet is mounted on the back side of the package (back-biased applications), the HAL320 is recommended.

The active offset compensation leads to constant magnetic characteristics over supply voltage and temperature. The sensor is designed for industrial and automotive applications and operates with supply voltages from 4.5 V to 24 V in the ambient temperature range from 40 up to 150 . The HAL300 is available in a SMD-package (SOT-89A) and in a leaded version (TO-92UA).