HAL 5xy
5. Application Notes
5.1. Ambient Temperature
Due to the internal power dissipation, the temperature
on the silicon chip (junction temperature T
J
) is higher
than the temperature outside the package (ambient
temperature T
A
).
T
J
=
T
A
+
ΔT
DATA SHEET
5.3. Start-Up Behavior
Due to the active offset compensation, the sensors
have an initialization time (enable time t
en(O)
) after
applying the supply voltage. The parameter t
en(O)
is
specified in the Electrical Characteristics (see
During the initialization time, the output state is not
defined and the output can toggle. After t
en(O)
, the out-
put will be low if the applied magnetic field B is above
B
ON
. The output will be high if B is below B
OFF
. In case
of sensors with an inverted switching behavior
(HAL 516 ... HAL 519), the output state will be high if B
> B
OFF
and low if B < B
ON
.
Note:
For magnetic fields between B
OFF
and B
ON
, the
output state of the HAL sensor will be either low
or high after applying V
DD
. In order to achieve a
defined output state, the applied magnetic field
must be above B
ON
, respectively, below B
OFF
.
Under static conditions and continuous operation, the
following equation applies:
ΔT
=
I
DD
×
V
DD
×
R
th
For all sensors, the junction temperature range T
J
is
specified. The maximum ambient temperature T
Amax
can be calculated as:
T
Amax
=
T
Jmax
–
ΔT
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.
For typical values, use the typical parameters. For
worst case calculation, use the max. parameters for
I
DD
and R
th
, and the max. value for V
DD
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.
R
V
220
Ω
1
V
EMC
V
P
4.7 nF
V
DD
OUT
3
20 pF
2 GND
R
L
1.2 kΩ
Note:
The functionality of the sensor below 3.8 V is
not tested on a regular base. For special test
conditions, please contact Micronas.
Fig. 5–1:
Test circuit for EMC investigations
46
Jan. 11. 2010; DSH000020_004EN
Micronas
MICRONAS [ MICRONAS ]
