MELEXIS MLX90217L Datasheet
MLX90217 Hall-Effect Cam Sensor Rev 1.7 18/December/00 Page 1
MLX90217
Hall-Effect Cam Sensor
Description
The MLX90217 is a self adjusting digital output rotary position gear tooth sensor designed for use in
automotive camshaft sensing as well as other speed
sensing applications. It is designed to be used with a
bias magnet south facing the back (non-marked) side
of the IC. The device has an open collector output
which is short circuit protected.
The MLX90217 is a sophisticated IC featuring an
on-chip 10-bit A/D Converter and logic that acts as a
digital sample and hold circuit. A separate 4-bit A/D
converter provides a fixed hysteresis. The 90217 does
not have a chopper delay. The 90217 uses a single Hall
plate which is immune to rotary alignment problems.
The bias magnet can be from 50 to 400mT.
As the signal is sampled, the logic recognizes an increasing or decreasing flux density. The output will
turn on (BOP) after the flux has reached its peak and
decreased by an amount equal to the hysteresis. Similarly the output will turn off (BOP) after the flux has
reached its minimum value and increased by an
amount equal to the hysteresis.
Functional Diagram
Pin 1 - VDD (Supply)
Pin 2 - VSS (Ground)
Pin 3 - Output
Amplifier
Voltage
Regulator
ADC
ADC
Logic
Protected
Output
1 2 3
Hall
Plate
10-Bit
4-Bit
Features and Benefits
n Rotary Position Gear Tooth Sensor
n Short Circuit Protection
n On-chip 10 bit A/D Converter
n Self-Adjusting Magnetic Range
n High Speed Operation
n No Chopper Delay
n Zero Speed Detection
n No Rotary Orientation Concerns
Applications
n Camshaft Sensor
n Geartooth Sensor
n Linear Encoder
n Rotary Encoder
n Direction Detection*
*See applications example
Ordering Information
Part No. Temperature Suffix Package Temperature Range
MLX90217 L UA -40oC to 150oC Automotive
Note: Static sensitive device, please observe ESD precautions.
MLX90217 Hall-Effect Cam Sensor Rev 1.7 18/December/00 Page 2
MLX90217
Hall-Effect Cam Sensor
MLX90217 Electrical Specifications
DC Operating Parameters TA = -40oC to 150oC, VDD = 3.5V to 24V (unless otherwise specified).
Parameter Symbol Test Conditions Min Typ Max Units
Supply Voltage VDD Operating 3.5 - 24 V
Supply Current IDD VDD = 12V 1.5 3.0 4.5 mA
Supply Current IDD VDD = 3.5V to 24V 1 - 6 mA
Leakage Current I
LEAK
V
OUT
= 3.5V to 24V - - 10 µA
Output Current I
OUT
Operating - - 25 mA
Output Saturation Voltage V
SAT
VDD = 12V, I
OUT
= 25mA - - 600 mV
Output Short Circuit Current I
FAULT
Fault 50 100 150 mA
Output Short Circuit Shutdown T
FAULT
Fault 100 - 200 µS
Clock Frequency f
CLK
Operating 300 500 800 kHz
Output Rise Time tr VDD=12V R1 = 880W C1 = 20pf - 400 nS
Output Fall Time tf VDD=12V R1 = 880W C1 = 20pf - 400 nS
Bandwidth BW Operating - - 15 kHz
Thermal Resistance RTH Operating - - 200
o
C/Watt
MLX90217 Magnetic Specifications
DC Operating Parameters TA = -40oC to 150oC, VDD = 3.5V to 24V (Unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Units
Back Bias Range B
BIAS
Operating -30 - 400 mT
Linear Region VDD = 12V 50 - 500 mT
Hysteresis B
hys
VDD = 3.5V to 24V 1.8 3.5 10 mT
Notes: 1 mT = 10 Gauss
Melexis Inc. reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Melexis does
not assume any liability arising from the use of any product or application of any product or circuit described herein.
Melexis Inc. reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Melexis does
not assume any liability arising from the use of any product or application of any product or circuit described herein.
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