DATA SHEET
HAL 525, HAL 526
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 Characteristics (see page 14).
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
B
ON. The output will be high if B is below BOFF.
TJ = TA + ΔT
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
At static conditions and continuous operation, the fol-
lowing equation applies:
BONmax, respectively, below BOFFmin
.
ΔT = IDD × VDD × Rth
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.
If IOUT > IDD, please contact Micronas application sup-
port for detailed instructions on calculating ambient-
temperature.
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.
Please contact Micronas for the detailed investigation
reports with the EMC and ESD results.
For all sensors, the junction temperature range TJ is
specified. The maximum ambient temperature TAmax
can be calculated as:
R
V
220 Ω
TAmax = TJmax – ΔT
R
1.2 kΩ
L
1
V
DD
V
V
EMC
OUT
3
5.2. Extended Operating Conditions
P
4.7 nF
20 pF
All sensors fulfill the electrical and magnetic character-
istics when operated within the Recommended Oper-
ating Conditions (see page 13).
2
GND
Supply Voltage Below 3.8 V
Fig. 5–1: Test circuit for EMC investigations
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. For special test conditions, please
contact Micronas.
Micronas
Nov. 30, 2009; DSH000144_003EN
23
MICRONAS [ MICRONAS ]
