MLX90224EVA-A Просмотр технического описания (PDF) - Melexis Microelectronic Systems

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MLX90224EVA-A

Dual Hall Effect Switch

Melexis Microelectronic Systems  

MLX90224

Dual Hall Effect Switch

6. MLX90224 Sensor Specific Specifications

DC Operating Parameters TA = -40oC to 85oC, VDD = 5V to 24V (unless otherwise specified)

Parameter

Operate Point

Release Point

Hysteresis

Symbol Test Conditions

BOP

BRP

BHYS

Min Typ Max Units

-

2.5 5.5

mT

-5.5 -2.5

-

mT

1.0 4.0 7.5

mT

Note:

1 mT = 10 Gauss

7. General Description

The MLX 90224 is designed for use with multipole ring magnet targets having evenly distributed North

and South magnetic poles on the circumference of the target. An example of the basic physical

arrangement of the sensor and magnet is shown in Fig. 1. The MLX90224 is available in 2 versions. The

first version provides the user with two digital output signals. Output S1 will provide a speed pulse from

the changing magnetic flux at sensing element S1. Output S2 will provide a phase shifted (d = 1.85 mm)

output identical in pulse width and period to S1. This version is referred to as MLX90224LVAA. The

MLX90224LVAB version provides an output signal that decodes the phase shifted signals to directly

provide an output for the speed which is twice the rotation speed of the target. The other output pin

represent the direction and changes from logic-high to logic-low when the direction of rotation of the

magnet is reversed. It allows to directly see the condition of the speed with twice the resolution of the

MLX90224LVAA and to also know directly the direction of rotation of the target. The MLX90224LVAA has

switching magnetic Bop and Brp values of typically +/- 2.5 mT as does the internal circuitry of the LVAB.

S

N

N

S

N

S

N

S

N

S

3901090224

Rev. 005

Figure 1: Application with a multipole ring magnet

Page 4 of 10

Data Sheet

July/03

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