Datasheet > LF22214TMR

LF22214TMR

更新时间： 2024-11-06 14:56:39

品牌	Logo	应用领域
力特 - LITTELFUSE		开关传感器
页数	文件大小	规格书
5页	559K
描述
TMR开关是一种数字磁性开关，集成了隧道磁阻（TMR）和CMOS技术，提供具有高灵敏度和超低功耗的磁性触发数字开关。? 它将TMR磁传感器和CMOS信号处理电路封装在一起，包括用于精确磁感测的片上

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LF22214TMR 数据手册

High Sensitivity Low Power TMR Switch Datasheet

LF22214TMR

TMR Omni-polar Switch 14 Gauss 1.5uA Open Drain Sensor

Description

The LF22214TMR TMR Switch is a digital omni-polar 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 open drain 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 1.5μA (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 LF22214TMR switches low (turns on) when the magnetic field

parallel to the sensing axis exceeds the operate point threshold,

BOP. When the magnetic field is reduced below the release point

BRP device output switches high (turns off). The difference

between the BOP and the BRP is the hysteresis BH of the device.

Functional Block Diagram

Osc and

Duty Control

Logic

Vcc

Power regulator

with temperature

compensation

Vout

Offset

Driver

TMR

Sensor

cancellation

Features and Benefits

■ Tunneling Magnetoresistance

GND

■ Low switching points for high

GND

(TMR) technology

sensitivity

■ Low power consumption at

■ Excellent thermal stability

1.5μA

■ High tolerance to external

■ X axis sensing direction

magnetic ﬁeld interference

TMR Switch Typical Applications Circuit

■ High frequency up to 1kHz

■ Wider airgap capability

■ Operation with north or south

Pole

■ Operates with smaller

magnets for cost reduction

■ 1.8V to 5.5V operating range

■ RoHS compliant

Vcc

TMR

Applications

Out

0.1µF

Out

■ Proximity detection

■ High speed sensing

■ Low power applications

■ Rotary sensing

■ Utility meters including gas,

water, electric and heat

meters

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.

B > B_OPS

0 < B < B_RPS

B < B_OPN

Low (On)

High (Off)

Low (On)

High (Off)

South Pole

North Pole

0 > B > B_RPN

Note: When power is turned on under Zero magnetic field, the output is “High”.

Speciﬁcations are subject to change without notice.

Revised: GD. 05/30/23

12 3 4 5

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LF223D	MPD	获取价格	Ultra-Miniature, 2W Dual Output SMT DC/DC Converters
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