Datasheet > LF21123TMR

LF21123TMR

更新时间： 2024-11-19 09:17:43

品牌	Logo	应用领域
力特 - LITTELFUSE		/
页数	文件大小	规格书
6页	660K
描述
Magnetic Field Sensor,

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LF21123TMR 数据手册

High Sensitivity Low Power TMR Switch

Position Sensing > LF11115TMR

TMR Bipolar Switch 17 Gauss 200nA Push Pull Sensor

Description

The LF11115TMR TMR Switch is a digital bipolar 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 contains a TMR magnetic sensor 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, CMOS push-pull

output and X axis sensing direction.

An internal band gap regulator is used to provide a temperature compensated

supply voltage for internal circuits, permitting a wide range of supply voltages.

It draws only 200nA (see Features below) resulting in low power operation,

additionally it has fast response, accurate switching points, excellent thermal

stability, and immunity to stray field interference. It is available in the SOT23-3

package. The output of the LF11115TMR switches low (turns on) when the

magnetic field parallel to the sensing axis exceeds the operate point threshold,

B_OP. When the magnetic field is reduced below the release point B_RPdevice

output switches high (turns off). The difference between the B_OPand the B_RPis

the hysteresis B_Hof the device.

Functional Block Diagram

Vcc

Power regulator

with temperature

compensation

Offset

TMR

Sensor

Features

Vout

Latch

cancellation

• X axis sensing direction

• Tunneling Magnetoresistance (TMR)

technology

• Ultra low power consumption at

200nA

• High frequency up to 50Hz

• Operation with north and south pole

• 1.8V to 5.5V operating range

GND

Benefits

• Low switching points for high

sensitivity

TMR Switch Typical Applications Circuit

• Wider airgap capability

• Operates with smaller magnets for

cost reduction

• Excellent thermal stability

• High tolerance to external magnetic

field interference

• RoHS compliant

Vcc

Out

TMR

0.1µF

Applications

Out

• Proximity detection

• Utility meters including gas and

water meters

• Speed sensing

• Battery powered applications

• Rotary sensing

GND

Output Behavior Versus Magnetic Pole

GND

Parameter

Test Conditions

Output (volts)

Note: It is strongly recommended that an external bypass capacitor be connected in-close-

proximity to the device between the supply and ground pins to reduce noise. The recommended

value for the external bypass capacitor is 0.1μF.

South Pole

North Pole

B > B_OPS

Low (On)

High (Off)

0 < B < B_RPS

Note:

The output is “High” when power is turned on under zero magnetic field.

When a S Pole approaches the pin 1 side, V_outwill transition to Low.

When a N Pole approaches the pin 1 side, V_outwill transition to High

Revised: 02/20/20

littelfuse.com

Speciﬁcations are subject to change without notice.

12 3 4 5 6

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