Melexis MLX90217 Technical data
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MLX90217
Hall-Effect Cam Sensor
Features and Benefits
■
Rotary Position Gear Tooth Sensor
■
Short Circuit Protection
■
On-chip 10 bit A/D Converter
■
Self-Adjusting Magnetic Range
■
High Speed Operation
■
No Chopper Delay
■
Zero Speed Detection
■
No Rotary Orientation Concerns
Applications
■
Camshaft Sensor
■
Geartooth Sensor
■
Linear Encoder
■
Rotary Encoder
■
Direction Detection*
*See applications example
Ordering Information
Part No. Temperature Suffix Package Code
MLX90217 L (-40
o
C to 150oC) UA (TO-92 flat)
Functional Diagram
Hall
Plate
Amplifier
Voltage
Regulator
1 2 3
Pin 1 - VDD (Supply)
Pin 2 - VSS (Ground)
Pin 3 - Output
Note:
precautions.
Static sensitive device, please observe ESD
ADC
4-Bit
Logic
Protected
Output
ADC
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
10-Bit
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 4bit 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.
3901090217 Page 1 Jun/04
Rev. 009
MLX90217
Hall-Effect Cam Sensor
MLX90217 Electrical Specifications
DC Operating Parameters TA = -40oC to 150oC, VDD = 3.5V to 24V (unless otherwise specified).
Parameter
Supply Voltage VDD Operating 3.5
Supply Current IDD VDD = 12V 1.5
Supply Current IDD VDD = 3.5V to 24V 1
Leakage Current I
Output Current I
Output Saturation Voltage V
Output Short Circuit Current I
Output Short Circuit Shutdown T
Clock Frequency f
Output Rise Time tr VDD=12V R1 = 880W C1 = 20pf
Symbol Test Conditions
V
LEAK
Operating -
OUT
VDD = 12V, I
SAT
Fault 50 100 150 mA
FAULT
Fault 100
FAULT
Operating 300 500 800 kHz
CLK
= 3.5V to 24V -
OUT
OUT
= 25mA -
Min Typ Max
-
3.0
-
-
-
-
-
-
24 V
4.5 mA
6 mA
10
25 mA
600 mV
200
400 nS
Units
A
µ
µ
S
Output Fall Time tf VDD=12V R1 = 880W C1 = 20pf
Bandwidth BW Operating -
Thermal Resistance RTH Operating -
-
-
-
400 nS
15 kHz
200
MLX90217 Magnetic Specifications
DC Operating Parameters TA = -40oC to 150oC, VDD = 3.5V to 24V (Unless otherwise specified)
Parameter
Back Bias Range B
Linear Region VDD = 12V 50
Hysteresis B
Notes:
1 mT = 10 Gauss
Symbol Test Conditions
Operating -30
BIAS
VDD = 3.5V to 24V 1.8 3.5 10 mT
hys
Min Typ Max
-
-
400 mT
500 mT
o
C/Watt
Units
3901090217 Page 2 Jun/04
Rev. 009
j
Performance Graphs
MLX90217
Hall-Effect Cam Sensor
Absolute Maximum Ratings
Supply Voltage (Operating), VDD 30V
Supply Current (Fault), IDD 50mA
Output Current (Fault), I
Output Current (Fault), I
Output Voltage, V
Power Dissipation, PD 100mW
Operating Temperature Range, TA - 40°C to 150°C
Storage Temperature Range, TS - 65°C to 150°C
Maximun Junction Temp, TJ 175°C
3901090217 Page 3 Jun/04
Rev. 009
OUT
30mA
OUT
50mA
fault
30V
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