HAL575SF-K datasheet(33/36 Pages) MICRONAS

33 / 36 page

DATA SHEET

HAL57x, HAL58x

Micronas

Dec. 22, 2008; DSH000145_003EN

5. Application Notes

5.1. Application Circuit

Fig. 5–1 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 cur-

rent consumption of 17 mA, the maximum RL can be

calculated as:

Fig. 5–1: Application circuit 1

For applications with disturbances on the supply line or

radiated disturbances, a series resistor RV (ranging

from 10

Ω to 30 Ω) and a capacitor both placed close

to the sensor are recommended (see Fig. 5–2). In this

case, the maximum RL can be calculated as:

Fig. 5–2: Application circuit 2

5.2. Extended Operating Conditions

All sensors fulfill the electrical and magnetic character-

istics when operated within the Recommended Oper-

ating Conditions (see page 14).

Typically, the sensors operate with supply voltages

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

sumption and the magnetic characteristics may be out-

side 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

the

Electrical

Characteristics

(see

page 15). During the initialization time, the current con-

sumption is not defined and can toggle between low

and high.

HAL57x

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

applied magnetic field B is above BON. The current

consumption will be low if B is below BOFF.

HAL58x

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.

Lmax

SUPmin

3.75 V

–

17 mA

-------------------------------------------

1 VDD

2 or

GND

x = pin 3 for TO92UA-1/-2 package

x = pin 4 for SOT89B-1 package

VSUP

VSIG

Lmax

SUPmin

3.75 V

–

17 mA

-------------------------------------------

–

1 VDD

2 or

GND

x = pin 3 for TO92UA-1/-2 package

x = pin 4 for SOT89B-1 package

VSUP

VSIG

4.7 nF

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