HAL501 datasheet(46/48 Pages) MICRONAS

46 / 48 page

HAL 5xy

DATA SHEET

April 15. 2010; DSH000020_004EN

Micronas

5. Application Notes

5.1. 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

temperature TA).

Under static conditions and continuous operation, the

following equation applies:

For all sensors, the junction temperature range TJ is

specified. The maximum ambient temperature TAmax

can be calculated as:

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 appli-

cation.

5.2. Extended Operating Conditions

All sensors fulfil the electrical and magnetic character-

istics when operated within the Recommended Oper-

ating Conditions (see page 14).

Supply Voltage Below 3.8 V

Typically, the sensors operate with supply voltages

above 3 V, however, below 3.8 V some characteristics

may be outside the specification.

Note: The functionality of the sensor below 3.8 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 output state is not

defined and the output can toggle. After ten(O), the out-

put will be low if the applied magnetic field B is above

BON. The output will be high if B is below BOFF. In case

of sensors with an inverted switching behavior

(HAL 516 ... HAL 519), the output state will be high if B

> BOFF and low if B < BON.

Note: For magnetic fields between BOFF and BON, the

output state of the HAL sensor will be either low

or high after applying VDD. In order to achieve a

defined output state, the applied magnetic field

must be above BON, respectively, below BOFF.

5.4. EMC and ESD

For applications with disturbances on the supply 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 pos-

sible to the HAL sensor.

Applications with this arrangement passed the EMC

tests according to the product standards ISO 7637.

Please contact Micronas for the detailed investigation

reports with the EMC and ESD results.

Fig. 5–1: Test circuit for EMC investigations

ΔT

ΔTI

Amax

Jmax

ΔT

–

220

VEMC

4.7 nF

VDD

OUT

GND

1.2 k

20 pF

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