HAL1000UT-A Datasheet, PDF (9/30 Pages) Micronas – Programmable Hall Switch

DATA SHEET
HAL 1000
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
Micronas
Feb. 3, 2009; DSH000015_003EN
9