HAL 5xy
DATA SHEET
5. Application Notes
5.3. Start-Up Behavior
5.1. Ambient Temperature
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 in the Electrical Characteristics (see
page 15).
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).
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
TJ = TA + ΔT
B
ON. 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
Under static conditions and continuous operation, the
following equation applies:
> 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
ΔT = IDD × VDD × Rth
must be above BON, respectively, below BOFF
.
For all sensors, the junction temperature range TJ is
specified. The maximum ambient temperature TAmax
can be calculated as:
5.4. EMC and ESD
TAmax = TJmax – ΔT
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.
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.
Applications with this arrangement passed the EMC
tests according to the product standards ISO 7637.
5.2. Extended Operating Conditions
Please contact Micronas for the detailed investigation
reports with the EMC and ESD results.
All sensors fulfil the electrical and magnetic character-
istics when operated within the Recommended Oper-
ating Conditions (see page 14).
R
V
Supply Voltage Below 3.8 V
220 Ω
Typically, the sensors operate with supply voltages
above 3 V, however, below 3.8 V some characteristics
may be outside the specification.
R
1.2 kΩ
L
1
V
DD
V
V
EMC
OUT
3
P
4.7 nF
20 pF
Note: The functionality of the sensor below 3.8 V is
not tested on a regular base. For special test
conditions, please contact Micronas.
2
GND
Fig. 5–1: Test circuit for EMC investigations
46
Jan. 11. 2010; DSH000020_004EN
Micronas
MICRONAS [ MICRONAS ]
