HAL1000 Datasheet, PDF (8/28 Pages) Micronas – Programmable Hall Switch

HAL 1000
DATA SHEET
2000
Filter = 2 kHz
1500
ADC-
READOUT
1000
500
0
–500
–1000
–1500
Range 150 mT
Range 90 mT
Range 60 mT
Range 30 mT
–2000
–200–150–100 –50 0 50 100 150 200 mT
B
Fig. 2–8: Typical ADC-READOUT
versus magnetic field for filter = 2 kHz
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.
Filter Frequency
80 Hz
160 Hz
500 Hz
1 kHz
2 kHz
ADC-READOUT RANGE
−3968...3967
−1985...1985
−5292...5290
−2646...2645
−1512...1511
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
−30 mT...30 mT
−40 mT...40 mT
−60 mT...60 mT
−75 mT...75 mT
−80 mT...80 mT
−90 mT...90 mT
−100 mT...100 mT
−150 mT...150 mT
RANGE
0
4
5
1
6
2
7
3
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