HAL506 Datasheet, PDF (40/44 Pages) List of Unclassifed Manufacturers – Hall Effect Sensor Family

HAL5xx
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 tem-
perature T_A).
T_J = T_A + ∆T
At static conditions, the following equation is valid:
∆T = I_DD * V_DD * R_th
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 application.
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 – ∆T
5.2. Extended Operating Conditions
All sensors fulfill the electrical and magnetic characteris-
tics when operated within the Recommended Operating
Conditions (see page 7).
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 has not
been tested. 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 t_en(O)) after applying
the supply voltage. The parameter t_en(O) is specified in
the Electrical Characteristics (see page 8).
During the initialization time, the output state is not de-
fined and the output can toggle. After t_en(O), the output
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 sen-
sors with an inverted switching behavior (HAL 516 ...
HAL519), the output state will be high if B > B_OFF and low
if B < B_ON.
For magnetic fields between B_OFF and B_ON, the output
state of the HAL sensor after applying V_DD will be either
low or high. In order to achieve a well-defined output
state, the applied magnetic field must be above B_ONmax,
respectively, below B_OFFmin.
40
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 figures 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 DIN 40839.
Note: The international standard ISO 7637 is similar to
the used product standard DIN 40839.
Please contact Micronas for the detailed investigation
reports with the EMC and ESD results.
R_V
220 Ω
V_EMC
V_P
1 V_DD
4.7 nF
2 GND
R_L 1.2 kΩ
OUT
3
20 pF
Fig. 5–1: Test circuit for EMC investigations
Micronas