HAL55x, HAL56x
5. Application Notes
5.2. Extended Operating Conditions
5.1. Application Circuit
All sensors fulfill the electrical and magnetic characteris-
tics when operated within the Recommended Operating
Conditions (see page 7).
Figure 5–1 shows a simple application with a two-wire
sensor. The current consumption can be detected by
measuring the voltage over R . For correct functioning
Typically, the sensors operate with supply voltages
above 3 V. However, below 4 V, the current consumption
and the magnetic characteristics may be outside the
specification.
L
of the sensor, the voltage between pin 1 and 2 (V
)
DD
must be a minimum of 4 V. With the maximum current
consumption of 17 mA, the maximum R can be calcu-
L
lated as:
Note: The functionality of the sensor below 4 V is not
tested on a regular base. For special test conditions,
please contact Micronas.
VSUPmin * 4V
RLmax
+
17 mA
1 V
DD
V
SUP
5.3. Start-up Behavior
V
SIG
Due to the active offset compensation, the sensors have
an initialization time (enable time t
the supply voltage. The parameter t
) after applying
is specified in
en(O)
R
GND
2
L
en(O)
the Electrical Characteristics (see page 8). During the
initializationtime, the current consumption is not defined
and can toggle between low and high.
Fig. 5–1: Application Circuit 1
HAL556:
For applications with disturbances on the supply line or
radiateddisturbances, aseriesresistorR (rangingfrom
After t
, the current consumption will be high if the
en(O)
V
10 Ω to 30 Ω) and a capacitor both placed close to the
applied magnetic field B is above B . The current con-
ON
sensor are recommended (see figure 5–2). In this case,
sumption will be low if B is below B
.
OFF
the maximum R can be calculated as:
L
HAL560, HAL566:
VSUPmin * 4V
RLmax
+
* RV
17 mA
In case of sensors with an inverted switching behavior,
the current consumption will be low if B > B and high
OFF
if B < B
.
ON
1 V
DD
V
SUP
R
V
Note: For magnetic fields between B
and B , the
ON
OFF
V
SIG
current consumption of the HAL sensor will be either low
or high after applying V . In order to achieve a defined
4.7 nF
DD
current consumption, the applied magnetic field must be
above B , respectively, below B .
GND
2
ON
OFF
R
L
Fig. 5–2: Application Circuit 2
18
Micronas
MICRONAS [ MICRONAS ]
