HAL 1820 DATA SHEET
22 July 3, 2013; DSH000158_003EN Micronas
4. Application Notes
4.1. 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
temperature T
A
).
T
J
= T
A
+ T
At static conditions and continuous operation, the fol-
lowing equation applies:
T = I
SUP
* V
SUP
* R
thjX
The X represents junction to air or to case.
For worst case calculation, use the max. parameters
for I
SUP
and R
thjX
, and the max. value for V
SUP
from
the application.
The following example shows the result for junction to
air conditions. V
SUP
= 5.5 V, R
thja
= 250 K/W and I
SUP
= 10 mA the temperature difference T = 13.75 K.
The junction temperature T
J
is specified. The maxi-
mum ambient temperature T
Amax
can be calculated as:
T
Amax
= T
Jmax
T
4.2. EMC and ESD
The HAL1820 is designed for a stabilized 5 V supply.
Interferences and disturbances conducted along the
12 V onboard system (product standard ISO 7637 part
1) are not relevant for these applications.
For applications with disturbances by capacitive or
inductive coupling on the supply line or radiated distur-
bances, the application circuit shown in Fig. 4–1 is rec-
ommended. Applications with this arrangement should
pass the EMC tests according to the product stan-
dards ISO 7637 part 3 (Electrical transient transmis-
sion by capacitive or inductive coupling) and part 4
(Radiated disturbances).
4.3. Application Circuit
For EMC protection, it is recommended to connect one
ceramic 47 nF capacitor between ground and output
voltage pin as well as 100 nF between supply and
ground.
Fig. 4–1: Recommended application circuit
4.4. Temperature Compensation
The relationship between the temperature coefficient
of the magnet and the corresponding TC and TCSQ
codes for linear compensation is given in the following
table. In addition to the linear change of the magnetic
field with temperature, the curvature can be adjusted
as well. For this purpose, other TC and TCSQ combi-
nations are required which are not shown in the table.
Please contact Micronas for more detailed information
on this higher order temperature compensation.
Note: Micronas recommends to use the HAL1820
Programming Environment to find optimal set-
tings for temperature coefficients. Please con-
tact Micronas for more detailed information.
Temperature Coefficient
of Magnet (ppm/K)
TC TCSQ
2100 8 0
1800 10 3
1500 12 4
1200 14 5
900 16 6
500 18 6
150 20 6
0215
300 22 5
500 23 4
750 24 4
1000 25 2
1500 27 0
2100 29 5
2700 31 5
OUT
V
SUP
GND
100 nF
HAL1820
47 nF
