Philips KMI15-2 Datasheet
DATA SH EET
Product specification
Supersedes data of 1996 Dec 05
File under Discrete Semiconductors, SC17
1998 Mar 25
DISCRETE SEMICONDUCTORS
KMI15/2
Integrated rotational speed sensor
dbook, halfpage
M3D281
1998 Mar 25 2
Philips Semiconductors Product specification
Integrated rotational speed sensor KMI15/2
FEATURES
• Digital current output signal
• Zero speed capability
• Wide air gap
• Wide temperature range
• Insensitive to vibration
• EMC resistant.
DESCRIPTION
The KMI15/2 sensor detects (rotational) speed and
reference mark detection of magnetized targets
(1)
.
The sensor consists of a magnetoresistive sensor
element, a signal conditioning integrated circuit in bipolar
technology and a magnetized ferrite magnet.
The frequency of the digital current output signal is
proportional to the rotational speed of a gear wheel.
(1) The sensor contains a customized integrated circuit. Usage in
hydraulic brake systems and in systems with active brake
control is forbidden.
CAUTION
Do not press two or more products together against their
magnetic forces.
PINNING
PIN DESCRIPTION
1V
CC
2V−
Fig.1 Simplified outline; (SOT453A).
handbook, halfpage
MBH780
12
QUICK REFERENCE DATA
SYMBOL PARAMETER MIN. TYP. MAX. UNIT
V
CC
DC supply voltage 0.5 12 16 V
I
CC (low)
current output signal low − 7 − mA
I
CC (high)
current output signal high − 14 − mA
f
t
operating frequency 0 − 25000 Hz
T
amb
ambient operating temperature −40 − +85 °C
1998 Mar 25 3
Philips Semiconductors Product specification
Integrated rotational speed sensor KMI15/2
LIMITING VALUES
In accordance with Absolute Maximum Rating System (IEC 134).
CHARACTERISTICS
T
amb
=25°C; VCC=12V; ft= 2 kHz; test circuit: see Fig.7; RL=115Ω.
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
V
CC
DC supply voltage T
amb
= −40 to +85 °C; RL=115Ω 0.5 16 V
T
stg
storage temperature −40 +150 °C
T
amb
operating ambient temperature −40 +85 °C
T
sld
soldering temperature t ≤ 10 s − 260 °C
output short-circuit duration to GND continuous
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
I
CC (low)
current output signal low see Fig.6 5.6 7.0 8.4 mA
I
CC (high)
current output signal high see Fig.6 11.2 14.0 16.8 mA
t
r
output signal rise time CL= 100 pF; 10 to 90% value − 0.5 −µs
t
f
output signal fall time CL= 100 pF; 10 to 90% value − 0.7 −µs
t
d
switching delay time between stimulation pulse (generated by
a coil) and output signal
− 1 −µs
f
t
operating frequency for both rotation directions 0 − 25000 Hz
Hs
LH
magnetic switching field
strength
0.05 0.3 0.8 kA/m
Hs
HL
magnetic switching field
strength
0.05 0.3 0.8 kA/m
Hs magnetic switching
hysteresis
0.15 − 1.6 kA/m
1998 Mar 25 4
Philips Semiconductors Product specification
Integrated rotational speed sensor KMI15/2
FUNCTIONAL DESCRIPTION
The KMI15/2 sensor is sensitive to magnetic fields.
The functional principle is shown in Fig.3. The field lines of
a magnetized target are shown in Fig.3 as a straight target
(it could also be circular e.g. for rotational speed
measurement). If a sensor KMI15/2 is moved as shown in
this field, either of the magnetic field components HsHL or
HsLH is dominant, and forces the sensor to switch to either
the high current (14 mA) or to the low current (7 mA).
Oscillation of the sensor output signal is avoided by the
implementation of a hysteresis into the signal conditioning
electronic.
The MR sensor is stabilized by a permanent magnet
applying a continuous magnetic field of ≥6 kA/m to the
sensor. If the magnetic field given by the magnetized
target errors like frequency doubling might occur.
The magnetoresistive sensor element signal is amplified,
temperature compensated and forwarded to a
Schmitt-trigger in the conditioning integrated circuit
(Figs 4 and 5). The digital output signal levels (Fig.6) are
independent of the magnetic field condition.
A (2-wire) output current enables safe transfer of the
sensor signal to the detecting circuit (Fig.7).
The integrated circuit housing is separated from the
sensor element housing to optimize the sensor behaviour
at high temperatures.
Fig.2 Component detail of the KMI15/2.
handbook, halfpage
y
z
xx
IC
sensor
magnet with
direction of
magnetization
MBH777
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