KMI18/4,115 NXP Semiconductors, KMI18/4,115 Datasheet - Page 6

• Manufacturer Part Number: KMI18/4,115
• Manufacturer: NXP Semiconductors

Specifications of KMI18/4,115

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Philips Semiconductors
FUNCTIONAL DESCRIPTION
The KMI18/4 is sensitive to the rotation of an passive
target wheel with ferrous reference marks. The functional
principle is shown in Fig.3. Because of the sensor layout
and setup of the measuring system, only movements of
reference marks in the y-direction will be sensed
(coordinate system see Fig.2).
The electrical output signal of the sensor is amplified,
temperature compensated and applied to a Schmitt trigger
in the signal conditioning circuit (see Fig.11). An additional
housing separates the conditioning circuitry from the
magnetoresistive sensor element, thereby ensuring
optimal sensor performance at high temperatures.
The signal level of the digital output is independent from
the sensing distance within the measuring range. Its
frequency equals that of the reference marks on the target
wheels. Accuracy of the HL-edge, as a measure of the
rotational angle, strongly depends on the properties of the
chosen target wheel and the operating conditions.
An open collector voltage interface ensures accurate
transmission (three wires) of the digital sensor signal to the
subsequent signal conditioning electronics.
2000 Sep 05
handbook, full pagewidth
Integrated rotational speed sensor
sensor
z
gear wheel
(a)
y
magnet
(b)
Fig.3 Functional principle.
field lines
magnetic
6
handbook, halfpage
Fig.2 Component detail and coordinate system.
1
y
(c)
2
x
direction
motion
3
of
magnet with
direction of
magnetization
sensor
IC
Objective specification
MBL222
(d)
x
KMI18/4
MRA957
z