HAL571 Datasheet, PDF(18/20 Page) List of Unclassifed Manufacturers

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HAL571 Datasheet, PDF (18/20 Pages) List of Unclassifed Manufacturers – Two-Wire Hall Effect Sensor Family

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HAL57x, HAL 58x

ADVANCE INFORMATION

5. Application Notes

5.1. Application Circuit

Figure 5â1 shows a simple application with a two-wire

sensor. The current consumption can be detected by

measuring the voltage over RL. For correct functioning

of the sensor, the voltage between pin 1 and 2 (VDD)

must be a minimum of 3.75 V. With the maximum current

consumption of 17 mA, the maximum RL can be calcu-

lated as:

RLmax

VSUPmin * 3.75

17 mA

VSUP

VSIG

1 VDD

2 or 3 GND

Fig. 5â1: Application Circuit 1

For applications with disturbances on the supply line or

radiated disturbances, a series resistor RV (ranging from

10 â¦ to 30 â¦) and a capacitor both placed close to the

sensor are recommended (see figure 5â2). In this case,

the maximum RL can be calculated as:

RLmax +

VSUPmin * 3.75

17 mA

* RV

VSUP

VSIG

4.7 nF

1 VDD

2 or 3 GND

5.2. Extended Operating Conditions

All sensors fulfill the electrical and magnetic characteris-

tics when operated within the Recommended Operating

Conditions (see page 7).

Typically, the sensors operate with supply voltages

above 3 V. However, below 3.75 V, the current consump-

tion and the magnetic characteristics may be outside the

specification.

Note: The functionality of the sensor below 3.75 V is not

tested on a regular base. For special test conditions,

please contact Micronas.

5.3. Start-up Behavior

Due to the active offset compensation, the sensors have

an initialization time (enable time ten(O)) after applying

the supply voltage. The parameter ten(O) is specified in

the Electrical Characteristics (see page 8). During the

initialization time, the current consumption is not defined

and can toggle between low and high.

HAL 57x:

After ten(O), the current consumption will be high if the

applied magnetic field B is above BON. The current con-

sumption will be low if B is below BOFF.

HAL 58x

In case of sensors with an inverted switching behavior,

the current consumption will be low if B > BOFF and high

if B < BON.

Note: For magnetic fields between BOFF and BON, the

current consumption of the HAL sensor will be either low

or high after applying VDD. In order to achieve a defined

current consumption, the applied magnetic field must be

above BON, respectively, below BOFF.

Fig. 5â2: Application Circuit 2

Micronas

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