MLX90217 datasheet(2/9 Pages) MELEXIS

2 / 9 page

3901090217

Rev.010

Page 2

Mar/12

MLX90217

Hall-Effect Geartooth Sensor

Functional Diagram

Hall

Plate

Amplifier

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.

Voltage

Regulator

Logic

Protected

Output

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.

Pin 1 - VDD (Supply)

Pin 2 - VSS (Ground)

Pin 3 - Output

Note:

Static

sensitive

device,

please

observe

ESD

precautions.

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 (BRP)

after the flux has reached its minimum value and

increased by an amount equal to the hysteresis.

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