Description

TMR138x is a digital omnipolar magnetic switch that

integrates TMR and CMOS technology in order to

provide a magnetically triggered digital switch with high

sensitivity, high speed, and low power consumption.

It is designed for use in applications that are both

power-critical and performance-demanding. It

contains a push-pull TMR sensor bridge and CMOS

signal processing circuitry within the same package,

including an on-chip TMR voltage generator for

precise magnetic sensing, a TMR voltage amplifier

and comparator plus a schmitt trigger to provide

switching hysteresis for noise rejection, and an

open-drain output. An internal band gap regulator

is used to provide a temperature compensated

supply voltage for internal circuits, permitting a wide

range of supply voltages from 3 V up to 40 V. The

TMR138x draws only 0.6 mA resulting in low-power

operation. It has fast response, accurate switching

points, excellent thermal stability, and immunity to

stray field interference. It is available in two compact

SOT23-3 and TO92S packages.

Features and Benefits

• Tunneling magnetoresistance (TMR) technology

• Low power consumption < 0.6 mA

• High frequency response ≥ 100 kHz

• Omnipolar operation

• In-plane X-Axis sensing

• High supply voltages of 40 V and 30 V reverse voltage

• Open-drain output

• High sensitivity

• Excellent temperature stability

• High tolerance to external magnetic field interference

Applications

• Utility meters: water, gas, and heat meters

• Proximity switches

• Speed sensing

• Position sensing

• Motor and fan control

• Power window