Semiconductors
Magnetoresistive
angle sensors
Covering all the angles in
automotive systems
Philips Semiconductors magnetoresistive sensor technology
is the superior choice for automotive measurement systems.
Features such as lack of wear, long term stability and
direct measurement combine to deliver highly accurate
and robust sensors. With stand-alone sensors, companion
signal conditioning ICs and complete single-package sensing
solutions our range of cost-effective angle sensors covers all
your application needs.
Offering many technical benefits over other technologies, Philips
magnetoresistive angle sensors provide car manufacturers with a more
reliable and accurate solution for automotive angle measurement – reducing
the risk of mechanical breakdowns and improving overall vehicle safety.
This is an increasingly important area within automotive electronics as the
industry moves closer to incorporating advanced X-by-wire networks and
control systems, such as FlexRay, that rely on accurate measurement data.
Magnetoresistive (MR) sensors by their nature are ideal for the severe
environmental conditions presented by automotive systems. Based
on the same, proven magnetoresistive technology used in automotive
applications such as anti-lock braking systems, MR sensors provide direct
angle measurement with long-term stability and wear-free operation.
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Key benefits
• Contactless angle measurement up to 180°
• Measurement independent of magnetic drift caused by life time
and temperature changes
• Operation independent of mechanical tolerances and shifts of
the magnet caused by thermal stress
• High temperature range
• Automotive qualification
• Highly flexible solutions that measure any automotive angle effectively
• Fully stable operation over long life-cycle
Key applications
• Electronic throttle control (ETC)
• Variable valve control (VVC)
• Pedal and wiper positioning
• Active suspension
• Automatic headlight adjustment
• Electronic steering
• Seat positioning
KMZ41, KMZ43T and X3T-KMZ043 (bare die) key specifications
Magnetoresistive angle sensors
KMZ41 / 43 and UZZ900x
Standalone MR sensor bridges for angular measurement
Philips’ KMZ41 and KMZ43 sensor bridges contain eight MR resistor networks etched into the same substrate, connected as two individual
Wheatstone bridges aligned at 45°. Possessing different sensitivities, our KMZ41 and KMZ43 angle sensors are designed to work with the UZZ900x
conditioning ICs. Ensuring maximum flexibility, Philips offers MR sensor bridges both as standalone devices in SO8 package and as bare die for
space-critical solutions.
Companion signal conditioning ICs for sensor bridges
Designed and developed specifically to complement Philips’ KMZ family of angle sensors, the UZZ9000 series provides optimized single-chip signal
conditioning solutions with either analog or 13-bit SPI interfacing. Incorporating all conditioning electronics they also offer an adjustable measurement
range and zero point to maximize design flexibility.
Item UZZ9000 UZZ9001
Supply voltage 5 V +/- 10 % 5 V +/- 10 %
Maximum angle range 0° - 180° 0° - 180°
Angle range variation 0° - 30 °... 0° - 180° in steps of 10° fixed to 0° - 180°
Zero point offset cancellation +/- 5° in steps of 0.5° fixed to 0.0°
Output type ratiometric analog voltage digital (SPI) with 13-Bit
Resolution of measurements < 0.1° < 0.05°
Accuracy (ideal intput signals) < +/- 0.4° < +/- 0.30°
Package SO24 (SOT137-1) SO24 (SOT137-1)
Temperature range -40°C to +150°C -40°C to +150°C
KMZ41 KMZ43T
X3T-KMZ043
Operating voltage max. 9 V max. 9 V
Angle range 180 degree 180 degree
Output signal sin/cos sin/cos
Sensitivity typ. 2.8 mV/V typ. 2.35 mV/V
Saturation field strength 100 kA/m 25 kA/m
Operating temperature range -40 ....+150 °C -40 ....+150 °C
14
bra159
KMZ41 UZZ9000
ADC1
14
ALGORITHM
RC-OSCILLATOR &
CLOCK GENERATOR
TEST AND TRIM
MODE RESET
DAC Vout
ADJUSTMENT
OF
OUTPUT CURVE
CHARACTERISTIC
+ VO1
- VO1
+ VO2
- VO2 ADC2
BUFFER
BUFFER
13 13
Two Chip solution
UZZ9000 / UZZ9001 key specifications
KMZ43T chip layout, showing the two separate bridges
Magnetoresistive angle sensors
KMA200
Single package angle sensor system with on-chip diagnostics
The KMA200 is a pre-aligned, ready-to-use sensor system. It consists
of a magnetoresistive element containing two independent MR sensor
bridges and a signal conditioning IC in a special multi-chip package.
Over voltage and reversed polarity protection are both incorporated
into the device, as is temperature supervision.
A self-monitoring function supervises the blocks of the sensor system
during normal operation, automatically detecting failures in any part
of the sensor system and quickly indicats such a diagnosis error to the
connected higher-level system. User programmability is achieved via
an SPI with all data stored permanently in on-chip EEPROM, allowing
specific adjustments of the angular range, zero point and clamping level
to be set. Additionally, the device can be programmed to work either in
analog or digital (SPI) output modes.
The Magnetoresistive principle
MR sensors use magnetic fields to conduct measurement information
between physical value and sensor. This contactless principle allows
isolation of all rotating components, making the entire sensing system
robust with respect to pollution and mechanical degradation. Another
characteristic is that MR sensors evaluate the direction of the magnetic
field and not the field strength: the field strength is not important as
long as it is above a certain operational minimum.
As a result, MR-based systems using the KMZ41 or KMZ43T can
tolerate variations in field strength caused by ageing, mechanical
fluctuations or temperature sensitivity of the magnet.
Max. deviation from ideal line 1.65 degree
at one point calibration
Linearity error step of 1 degree 0.1 degree
Repeatability 0.1 degree
Resolution of analog output signal 0.04 degree
Temperature drift of analog output 0.64°max @ -25...+125°C
Measurement update rate 4 kHz
Analog output voltage with positive slope
Signal Processing
Magneto Resistive Element
Angle Sensor Chip
Thin Film Technology
The KMA200 sensor system
KMA200 key specifications
KMA200 key features
• Programmable angle range (max. 180°)
• 4 analog and 2 digital output modes selectable
• 5 V supply
• Ratiometric analog output
• Reverse supply voltage protection up to 16.5 V
• Over voltage protection up to 26.5 V
• Over voltage maximum 32 V (for 400 ms)
• EEPROM (user programmable)
• On-line diagnosis of all main functional blocks
• Ambient temperature range – 40 °C to + 160 °C
bra160
ONLINE DIAGNOSIS
EEPROM/
RAM
INPUT
STAGE µC OUTPUT
STAGE
TEMPERATURE
SENSOR OSCILLATOR
MR SENSOR SIGNAL CONDITIONING ELECTRONICS
KMA200 single package solution
www.semiconductors.philips.com
Date of release: October 2004
Document order number: 9397 750 14132
Published in The Netherlands
Philips Semiconductors
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© Koninklijke Philips Electronics N.V. 2004
All rights reserved. Reproduction in whole or in part is prohibited without the prior
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Magnetoresistive angle sensors
Covering all the angles in automotive systems
Portfolio overview
Type Product Package Supply voltage (V) Angle range Output value Output type Operating
temperatures °C
KMZ41 sensor SO8 5.0 ... 9 180° 80 mV peak-peak sine / cosine -40 ... 150
KMZ43 sensor SO8 5.0 ... 9 180° 68 mV peak-peak sine / cosine -40 ... 150
X3T-KMZ043 sensor Die 5.0 ... 9 180° 68 mV peak-peak sine / cosine -40 ... 150
UZZ9000
signal conditioning unit
SO24 4.5 ... 5.5 180° 0.5 ... 4.5 V analog linear -40 ... 150
UZZ9001
signal conditioning unit
SO24 4.5 ... 5.5 180° 0.5 ... 4.5 V digital -40 ... 150
KMA200 sensor system SOT637 4.5 ... 5.5 180° 0.5 ... 4.5 V 4 analog linear / -40 ... 160
2 digital
