HAL11x
5. Application Notes
5.2. Ambient Temperature
Due to the internal power dissipation, the temperature
5.1. Application Circuit
on the silicon chip (junction temperature T ) is higher
J
thanthetemperatureoutsidethepackage(ambienttem-
The HAL11x sensors can operate without external com-
ponents. For applications with disturbances on the sup-
ply line or radiated disturbances, a series resistor and a
capacitor are recommended (see Fig. 5–1).
perature T ).
A
T = T + ∆T
J
A
At static conditions, the following equation is valid:
∆T = I * V * R
The series resistor and the capacitor should be placed
as closely as possible to the sensor.
DD
DD
th
For typical values, use the typical parameters. For worst
case calculation, use the max. parameters for I and
R
V
DD
R , and the max. value for V from the application.
th
DD
220 Ω
For all sensors, the junction temperature range T is
R
J
L
1
V
DD
specified. The maximum ambient temperature T
can be calculated as:
Amax
OUT
3
V
DD
T
Amax
= T
– ∆T
Jmax
4.7 nF
5.3. Extended Operating Conditions
2
GND
All sensors fulfill the electrical and magnetic characteris-
tics when operated within the Recommended Operating
Conditions (see page 6).
Fig. 5–1: Recommended application circuit
Pleaseuse the sensors of the HAL 5xx family if lower op-
eration voltage, lower current consumption or tighter
magnetic specifications required.
V
DD
5.4. Start-up Behavior
L
1
L
2
The sensors have an initialization time (enable time
3.3 k
R
1
t
t
) after applying the supply voltage. This parameter
is specified in the Electrical Characteristics (see
en(O)
R
2
en(O)
page 7).
1
3.3 k
HAL115
3
During the initialization time, the output state is not de-
2
fined and can toggle. After t , the output will be low
en(O)
if the applied magnetic field B is above B or high if B
2.2 µ/50 V
2.2 µ
ON
/50 V
is below B
.
OFF
C
C
1
2
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
and B , the output
ON
OFF
Fig. 5–2: Recommended application circuit
for DC fans
DD
state, the applied magnetic field must be above B
,
ONmax
respectively, below B
.
OFFmin
14
Micronas
MICRONAS [ MICRONAS ]
