Triaâisï Hall Sensor MLX90316

Tria⊗is Hall Sensor 

MLX90316 

© Copyright Melexis Microelectronic Integrated Systems. All Rights Reserved

Content 

Planar Hall vs. IMC® Hall 

Tria⊗is Hall Sensor – MLX90316 

Versatility 

• Tria⊗is 2D Position Sensor – Rotary Position Sensor 

• Tria⊗is 3D Position Sensor – Joystick 

• Tria⊗is 1D Position Sensor – Linear Position Sensor 

Redundancy 

Self Diagnostic Features 

Applications 

Summary 


Y 


B “through” the IC 

(no sensitivity to B “parallel”) 

Z 

X 

B Z 

B “parallel” to the IC 



Integrated Magneto Concentrator + Planar Hall 

(1 × IMC® Disk) (2 × 2 plates) 

Thanks to the IMC, the flux density parallel (horizontal) 

to the IC surface is converted into orthogonal (vertical) 

components suitable for the planar Hall plates 


Why the Name “Tria⊗is” ? 

Bz 

Bz Bz 

HP1 HP2 

HP1 => B1 = B - Bz 

HP2 => B2 = -B - Bz 

Differential Mode ⇒ B ⊥X & B ⊥Y 

B Z cancelled 

Direct Mode ⇒ B Z 

B ⊥X & B ⊥Y cancelled 

Differential ì-î => B1 - B2 

B1 - B2 = B - Bz - (-B - Bz) = 2 B 

Direct ì+î => B1 + B2 

B1 + B2 = B - Bz + (-B - Bz) = -2 Bz 

Same Hall Plates 

=> Intrinsically 

Matched Signals 



Tria�is 

Vx 

Vy 

Vz 

MUX 

G 

A 

15 

D 

ROM - F/W 

DSP 

µC 

RAM 

EEP 

ROM 

Serial Protocol 

3V3 

Reg 

D 

12 

A 

Rev.Pol. 

& 

OverVolt. 

x 1 

x 1 

Vdd 

Out1 

Out2 

Vss 







Benefits (1/2) 

Compact Monolithic CMOS IC 

Non-Contacting Position Sensor 

Absolute Position Sensor 

Fully Programmable 

3 Matched Hall Signals for Bx, By, Bz 

High Accuracy: Less Sensitive to the Flux Density Strength 

Variations (Temperature, Lifetime, Airgap) 

Cheap Magnet - “Easy” Magnetic Design 



Benefits (2/2) 

Surface-Mount Device 

Small-size Position Sensor 

Microcontroller (16 bits RISC Processor) based DSP ⇒ “Smart 

Sensor” 

Versatility through DSP Firmware (10 KB ROM) change (1D, 

2D, 3D, complex calculations, interpolation, mapping,…) 

Redundancy 



Tria⊗is Rotary Position Sensor 

(2D Position Sensor) 

Bx & By (G) 

400 

300 

200 

100 

0 

-100 

-200 

-300 

-400 

0 90 180 270 360 450 540 630 720 

Alpha (Degree) 

BX ÷ cos(α) & BY ÷ sin(α) 

(quadrature, matched) 

By 

Bx 




VX ÷ BX ÷ cos(α) & VY ÷ BY ÷ sin(α) 

DSP ⇒ α = Atan(VY/VX) 

Tria�is 

Vx 

Vy 

MUX 

G 

A 

15 

D 

DSP 

µC 

3V3 

Reg 

Vout(α) = Offset + Gain × α 

ROM “2D” 

RAM 

EEP 

ROM 


D 

12 

A 

Rev.Pol. 

& 

OverVolt. 

x 1 

x 1 

Vdd 

Out1 - α 

Vss 




VOUT (%VDD) 

100 

90 

80 

70 

60 

50 

40 

30 

20 

10 

0 

0 90 180 270 360 450 540 630 720 


VOUT 


X 

Z 

Tria⊗is Joystick Position Sensor 


Y 

B 

N 

S 

BX ÷ cos(α)×sin(β) 

BY ÷ sin(α)×cos(β) 

BZ ÷ cos(α)×cos(β) 


Tria⊗is Joystick Position Sensor 


DSP ⇒ α = Atan(VY/VZ) 

⇒ β = Atan(VX/VZ) 

Tria�is 

Vx 

Vy 

Vz 

MUX 

G 

A 

15 

D 

ROM “3D” 

DSP 

µC 

RAM 

EEP 

ROM 


3V3 

Reg 

D 

12 

A 

Rev.Pol. 

& 

OverVolt. 

x 1 

x 1 

Vdd 

Out1 - α 

Out2 - β 

Vout1(α) = Offset1 + Gain1 × α 

Vout2(β) = Offset2 + Gain2 × β 

Vss 


Tria⊗is Linear Position Sensor 


B 

z 

x 

y 

substrate 

flux lines 

N 

S 

Triaxis 

Hall sensor 

moving 

permanent 

magnet 




y 

output [V] 

x 

0.2 

0.15 

0.1 

0.05 

0 

-0.05 

-0.1 

magnetic flux [a.u.] 

1.2 

1 

0.8 

0.6 

0.4 

0.2 

0 

-0.2 

-0.4 

-4 -3 -2 -1 0 1 2 3 4 

position [mm] 

-0.6 

-2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 

Vx 

Vy 

Vx/Vy 

1.5 

1 

0.5 

0 

-0.5 

-1 

-1.5 

ratio Vx/Vy 

x position [mm] 

Bx 

By 




DSP ⇒ d = VX/VY 

Tria�is 

Vx 

Vy 

MUX 

G 

A 

15 

D 

DSP 

µC 

3V3 

Reg 

Vout(d) = Offset + Gain × d 

ROM “1D” 

RAM 

EEP 

ROM 


D 

12 

A 

Rev.Pol. 

& 

OverVolt. 

x 1 

x 1 

Vdd 

Out1 - d 

Vss 


Tria⊗is Position Sensor 

MLX91204 (former 2SA-10) 

Tria�is Vx G 

Vy 

G 

Zener 

Zap 

Vdd 

Cosine 

Common 

Sine 

Vss 

!! Ideal for hi-speed rotary 

position sensor !! 

!! angular information 

computed off-chip !! 


Redundancy (1/2) 

Out1 & Out2 from 2 Single ICs 

Galvanic Isolation between both ICs 

Tracking Relationship: |Out1 – ℵ × Out2| < TE 

• ℵ = Tracking Factor 

• TE = Allowed Tracking Error 

⇒ 2 Discrete ICs 

or 

Melexis Melexis 

2 Isolated Dies in 1 SMD Package… 

Melexis 

Melexis 


Redundancy (2/2) 



ROM, RAM, EEPROM Check 

EEPROM Error Correction (Hamming Code) 

ADC, DAC, Regulator 

Adaptive Parameters Monitoring 

“Radius” Check 

Signals Plausibility Check 

Overvoltage, Undervoltage 

Broken Ground Connection 

Watchdog Timer 

F/W Flow Monitoring through Intelligent 

Watchdog (Observer) 


Pedal Position Sensor (PPS – Accelerator, 

Brake & Clutch) 

Intake Throttle (Gasoline) Position Sensor (TPS) 

Cut-Off Valve (Diesel) Position Sensor 

Exhaust Gas Recirculation (EGR) Valve Position 

Sensor 

Motorized Manifold Valve Position Sensor 

Smart Actuator 

Applications (1/7) 



Steering Wheel Position Sensor 

“Torque” Sensor by means of Position Sensor 

“Weight” Sensor by means of Position Sensor 

“Tension” Sensor by means of Position Sensor 

Contactless “e-Potentiometer” 

Fuel Level Position Sensor 

Ride Height Position Sensor 



Windshield Wiper Position Sensor 

Motor Position Sensor (e.g. Electrical 

Power Steering Motor…) 

Transmission Lever Position Sensor 

Gearshift Position Sensor (PRNDL) 

3D Position Sensor (“Joystick”) 

iDrive/MMI Position Sensor 

… 



Electronic Throttle Control (ETC) 

Integrated Pedal Assembly 

Pedal Position 

Sensor (PPS) EMS ECU 

(Engine 

Management 

System Electronic 

Control Unit) 

Electronic Throttle Body (ETB) 

Actuator 

Throttle Position 

Sensor (TPS) 



Electrical Power Steering (EPS) 



Steering Wheel Position Sensor 


Ubat 

Ground 

Lin/PWM 


Smart Actuator 

e.g. MLX81100 

MCU 

SPI 

Position 

Sensor 

H-Bridge 

e.g. MLX90316 

e.g. DC Motor + Gears 

Motor 



MLX90316 – Summary (1/2) 

VOUT (%VDD) 

100 

90 

80 

70 

60 

50 

40 

30 

20 

10 

0 

0 90 180 270 360 450 540 630 720 


VOUT 



MLX90316 – Summary (2/2) 

Compact Monolithic CMOS IC 

Fully Programmable 

High Accuracy: Less Sensitive to the Flux Density Strength 

Variations (Temperature, Lifetime, Airgap) 

Cheap Magnet - “Easy” Magnetic Design – End-of-Shaft 

Non-contacting Position Sensor 

Absolute Rotary Position Sensor up to 360 Degrees 

Surface-Mount Device – Small Size Sensor 

Microcontroller based DSP ⇒ “Smart Sensor” 

Redundancy 


A real alternative to Inductive & MR solutions 


Questions & Answers 

Thank You 


About Melexis… 

European Automotive IC Supplier 

Innovator in mixed signal CMOS sensors ICs and 

sensor interface ICs 

Combining sensors with microcontrollers 

Technology developer in micromachined (MEMS) 

sensors (pressure, acceleration, gyro, infra-red) 

Broad technological know-how (Hall, opto, infrared, 

CMOS camera, Lin bus, RF,…) 

Wide range of automotive applications 

Turn Over 2005: 172 M€ 

More info on www.melexis.com 


Auto Born and Bred Splash Screen 

Innovator in Mixed Signal CMOS Sensors & Microcontrollers 

Automotive focus, certified to ISO/TS16949 for our Quality and Management systems 


What drives us?

Triaâisï Hall Sensor MLX90316

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?

Triaâisï Hall Sensor MLX90316