HAL300
DATA SHEET
4. Application Notes
4.2. Extended Operating Conditions
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 sensi-
tivity of the sensor IC cannot be completely compen-
sated for by the switching offset compensation tech-
nique.
All sensors fulfill the electrical and magnetic characteris-
tics when operated within the Recommended Operating
Conditions (see page 13).
Supply Voltage Below 4.5 V
Typically, the sensors operate with supply voltages
above 3 V, however, below 4.5 V some characteristics
may be outside the specification.
For back-biased applications, the HAL320 is recom-
mended. 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 indi-
cated in this data sheet.
Note: The functionality of the sensor below 4.5 V is not
tested on a regular base. For special test condi-
tions, please contact Micronas.
4.1. Ambient Temperature
4.3. Start-up Behavior
Due to the internal power dissipation, the temperature
Due to the active offset compensation, the sensors have
on the silicon chip (junction temperature T ) is higher
J
an initialization time (enable time t ) after applying
en(O)
thanthetemperatureoutsidethepackage(ambienttem-
the supply voltage. The parameter t
is specified in
en(O)
perature T ).
A
the Electrical Characteristics (see page 14).
T = T + ΔT
J
A
During the initialization time, the output state is not de-
fined and the output can toggle. After t
will be low if the applied magnetic field B is above B
, the output
en(O)
Under static conditions and continuous operation, the
following equation applies:
.
ON
The output will be high if B is below B
.
OFF
ΔT = I * V * R
th
DD
DD
For magnetic fields between B
state of the HAL sensor after applying V will be either
low or high. In order to achieve a well-defined output
state, the applied magnetic field must be above B
and B , the output
ON
OFF
For typical values, use the typical parameters. For worst
case calculation, use the max. parameters for I and
DD
DD
R , and the max. value for V from the application.
th
DD
,
ONmax
respectively, below B
.
OFFmin
For all sensors, the junction temperature range T is
J
specified. The maximum ambient temperature T
can be calculated as:
Amax
T
Amax
= T
– ΔT
Jmax
20
Micronas
MICRONAS [ MICRONAS ]
