HAL1000
DATA SHEET
Filter Frequency
Filter = 2 kHz
2000
ADC-READOUT RANGE
−3968...3967
−1985...1985
−5292...5290
−2646...2645
−1512...1511
80 Hz
160 Hz
1500
ADC-
READOUT
1000
500
0
–500
–1000
–1500
–2000
–200–150–100 –50
Range 150 mT
Range 90 mT
Range 60 mT
Range 30 mT
0
50 100 150 200 mT
B
500 Hz
1 kHz
2 kHz
Note:
The maximum and minimum ADC-READOUT
must not be exceeded during calibration of the
sensor and operation near the switching points.
Range
The RANGE bits are the three lowest bits of the MODE
register; they define the magnetic field range of the A/
D converter.
Magnetic Field Range
RANGE
0
4
5
1
6
2
7
3
Fig. 2–8:
Typical ADC-READOUT
versus magnetic field for filter = 2 kHz
−30
mT...30 mT
−40
mT...40 mT
−60
mT...60 mT
An external magnetic field generates a Hall voltage at
the Hall plate. The ADC converts this amplified Hall
voltage (operates with magnetic north and south poles
at the branded side of the package) to a digital value.
Positive values correspond to a magnetic north pole
on the branded side of the package. The digital signal
is filtered in the internal low-pass filter and is then
readable in the ADC-READOUT register. Depending
on the programmable magnetic range of the Hall IC,
the operating range of the A/D converter is from
−
30 mT ... +30 mT up to
−150
mT ... +150 mT.
The ADC-READOUT at any given magnetic field
depends on the programmed magnetic field range and
also on the filter frequency. Fig. 2–8 shows the typical
ADC-READOUT values for the different magnetic field
ranges with the filter frequency set to 2 kHz.
The relationship between the minimum and maximum
ADC-READOUT values and the filter frequency setting
can be seen in the following table.
−75
mT...75 mT
−80
mT...80 mT
−90
mT...90 mT
−100
mT...100 mT
−150
mT...150 mT
Filter
The FILTER bits are the three highest bits of the
MODE register; they define the
−3
dB frequency of the
digital low pass filter.
−3
dB Frequency
80 Hz
160 Hz
500 Hz
1 kHz
2 kHz
FILTER
0
1
2
3
4
8
March 4, 2004; 6251-528-1DS
Micronas
MICRONAS [ MICRONAS ]
