MLX92211-BAA-xxx

3-Wire Hall Effect Latch

390109221106 – REV 8

Page 7 of 12

Aug/14

7 Detailed General Description

Based on mixed signal CMOS technology, Melexis MLX92211 is a Hall-effect device with a pre-programmed

magnetic threshold. It allows using generic magnets, weak magnets or larger air gap.

The chopper-stabilized amplifier uses switched capacitor techniques to suppress the offset generally observed with

Hall sensors and amplifiers. The CMOS technology makes this advanced technique possible and contributes to

smaller chip size and lower current consumption than bipolar technology. The small chip size is also an important

factor to minimize the effect of physical stress.

This combination results in more stable magnetic characteristics and enables faster and more precise design.

The operating voltage from 2.7V to 24V, pre-programmed tc and an operating

temperature range according to “L”

specification make this device suitable for automotive, industrial and consumer low voltage applications.

The output signal is open-drain type. Such output allows simple connectivity with TTL or CMOS logic by using a pull-

up resistor tied between a pull-up voltage and the device output

8 Latching Characteristic

The MLX92211-BAA exhibits bipolar magnetic switching characteristics.

OUT = High

Flux density

Output level

B

OP

B

RP

0mT

OUT = Low

Latch characteristic

Typically, the device behaves as a latch with symmetric

operating and release switching points (BOP=|BRP|).

A bipolar switch is closely operating as a latch as it requires

both magnetic poles to turn the output ON and OFF. However ,

magnetic parameters limits are defined so that the magnetic

memory is not guaranteed. In absence of magnetic field, the

output could keep or change its state depending on the

operating conditions.