HAL114 Просмотр технического описания (PDF) - Micronas

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HAL114

Hall Effect Sensor Family

Micronas 

HAL11x

5. Application Notes

5.1. Application Circuit

The HAL 11x sensors can operate without external com-

ponents. For applications with disturbances on the sup-

ply line or radiated disturbances, a series resistor and a

capacitor are recommended (see Fig. 5–1).

The series resistor and the capacitor should be placed

as closely as possible to the sensor.

RV

220 Ω

1 VDD

VDD

4.7 nF

2 GND

RL

OUT

3

Fig. 5–1: Recommended application circuit

VDD

L1

3.3 k R1

R2

1

HAL115

3

3.3 k

2

2.2 µ/50 V

C1

L2

2.2 µ

/50 V

C2

Fig. 5–2: Recommended application circuit

for DC fans

5.2. Ambient Temperature

Due to the internal power dissipation, the temperature

on the silicon chip (junction temperature TJ) is higher

than the temperature outside the package (ambient tem-

perature TA).

TJ = TA + ∆T

At static conditions, the following equation is valid:

∆T = IDD * VDD * Rth

For typical values, use the typical parameters. For worst

case calculation, use the max. parameters for IDD and

Rth, and the max. value for VDD from the application.

For all sensors, the junction temperature range TJ is

specified. The maximum ambient temperature TAmax

can be calculated as:

TAmax = TJmax – ∆T

5.3. Extended Operating Conditions

All sensors fulfill the electrical and magnetic characteris-

tics when operated within the Recommended Operating

Conditions (see page 6).

Please use the sensors of the HAL 5xx family if lower op-

eration voltage, lower current consumption or tighter

magnetic specifications required.

5.4. Start-up Behavior

The sensors have an initialization time (enable time

ten(O)) after applying the supply voltage. This parameter

ten(O) is specified in the Electrical Characteristics (see

page 7).

During the initialization time, the output state is not de-

fined and can toggle. After ten(O), the output will be low

if the applied magnetic field B is above BON or high if B

is below BOFF.

For magnetic fields between BOFF and BON, the output

state of the HAL sensor after applying VDD will be either

low or high. In order to achieve a well-defined output

state, the applied magnetic field must be above BONmax,

respectively, below BOFFmin.

14

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