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PDF KMI20-2 Data sheet ( Hoja de datos )
| Número de pieza | KMI20-2 | |
| Descripción | Rotational speed sensor | |
| Fabricantes | Philips | |
| Logotipo |  |
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DISCRETE SEMICONDUCTORS
DATA SHEET
handbook, halfpage
M3D281
KMI20/2
Rotational speed sensor for
extended air gap application
Objective specification
2000 Sep 04
1 page  
Philips Semiconductors
Rotational speed sensor for
extended air gap application
Objective specification
KMI20/2
handbook, full pagewidth
VOLTAGE CONTROL
CONSTANT
CURRENT
SOURCE
VCC
SENSOR
ADJUSTABLE
AMPLIFIER
OFFSET
CANCELLATION
Fc = 0 Hz
SMART
COMPARATOR
SWITCHABLE
CURRENT
SOURCE
V−
DIGITAL CONTROL UNIT
ON-CHIP
OSCILLATOR
MBL238
Fig.4 Block diagram.
Figure 5 shows the digital compensation function in
algorithmic format. After power-on the sensor system is
running in INITIAL MODE 0 Hz. The sensor signal is
preamplified but not offset compensated. The output
signal represents the specified magnetic field strength
(see Chapter “Characteristics”), totally speed
independent. When there is a magnetic offset the system
must first detect the sensor signal amplitudes to
compensate for it (INITIAL_MODE_1_Hz). An output
signal is produced (first compensation run finished) at the
latest after 11 magnetic field pairs with a frequency above
1 Hz have been sensed.
After detecting the fields in initial mode the PDIC changes
to ACTIVE MODE. The sensor signal is permanently offset
compensated. The hysteresis is now directly dependent
on the last magnetic amplitude (30% to 45%,
see Chapter “Characteristics”) down to typically 50 A/m.
Quitting ACTIVE MODE is caused by power off or by
decreasing the magnetic field frequency below 1 Hz. The
system is locked into COMPENSATION MODE and
continues to detect every magnetic field down to zero
speed.
Power on
INITIAL MODE 0 Hz
maximum 11 periods
and fs > 1 Hz
INITIAL MODE 1 Hz
dmax = din 0 Hz
dmax = din 1 Hz
ACTIVE MODE
fs < 1 Hz
dmax = dact
fs > 1 Hz
COMPENSATION MODE
locked data
dmax = din 0 Hz
MBL228
Fig.5 PDIC function algorithm.
2000 Sep 04
5
5 Page 
Philips Semiconductors
Rotational speed sensor for
extended air gap application
NOTES
Objective specification
KMI20/2
2000 Sep 04
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet KMI20-2.PDF ] | |
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