MLX90366

Triaxis



Position Sensor Assembly feat. SENT

MLX90366

Page 7 of 34

Datasheet

Rev. 1.0

25/Jun/13

5.

Absolute Maximum Ratings

 24 V

Reverse Voltage Protection

 12 V (breakdown at -14 V)

Positive Output Voltage

 18 V (breakdown at 24 V)

 30 mA (in breakdown)

Reverse Output Voltage

 0.3 V

Reverse Output Current

 50 mA (in breakdown)

 40°C   150C

 40°C   150C

Magnetic Flux Density

 1 T

Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute maximum

rated conditions for extended periods may affect device reliability.

6. Description

are generated at the Hall plates and amplified.

The analog signal processing is based on a fully differential analog chain featuring the classic offset

cancellation technique (Hall plate 2-Phases spinning and chopper-stabilized amplifier).

The conditioned analog signals are converted through an ADC (15 bits) and provided to a DSP block for

further processing. The DSP stage is based on a 16 bit RISC micro-controller whose primary function is

the extraction of the position from two (out of three) raw signals (after so-called front-end compensation

steps) through the following function:





2

V

k

V









Where alpha is the magnetic angle

(B1, B2), V

The DSP functionality is governed by the micro-code (firmware

 F/W) of the micro-controller which is

stored into the ROM (mask programmable). In addition to the magnetic angle extraction, the F/W controls

the whole analog chain, the output transfer characteristic, the output protocol, the programming/calibration

and also the self-diagnostic modes.

The magnetic angular information is intrinsically self-compensated vs. flux density variations. This feature

allows therefore an improved thermal accuracy vs. position sensor based on conventional linear Hall

sensors.

In addition to the improved thermal accuracy, the realized position sensor features excellent linearity

performance taking into account typical manufacturing tolerances (e.g. relative placement between the

Hall IC and the magnet).