Datasheet > MLX74190

MLX74190

更新时间： 2024-11-12 01:17:31

品牌	Logo	应用领域
迈来芯 - MELEXIS		/
页数	文件大小	规格书
14页	493K
描述
Two-Fold High Power LF Initiator With integrated Immobilizer

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MLX74190 数据手册

MLX74190

Two-Fold High Power LF Initiator

With integrated Immobilizer

Features and Benefits

Application Examples

 2 High power independent drivers (2.5Apeak in

square and 1Apeak in sine mode)

 Passive Start system

 TPMS Initiator

 Full bridge drive capabilities

 LF door opener

 Built-in protection features (antenna fault detection,

over current and T°) for guaranteed safe operation

in all conditions

 Active RFID initiator

 Easy-to-use through SPI interface

 Built-in ASK and FSK immobilizers

Ordering Information

Option

Code

Packing Form

Code

Part Code Temperature Code

MLX74190 R (-40°C to 105°C)

Package Code

PF (Lead free TQFP 7x7 48 leads)

ABA-000

This document is a Product Preview, to get access to the full datasheet and related documentations, please directly

contact Melexis at sales_europe@melexis.com or sales_usa@melexis.com.

Description

The MLX74190 low-frequency (LF) initiator IC consists in two high power LF drivers and built-in immobilizers

(IMMO).

The main application for the MLX74190 is automotive remote

passive start, where the IC transmits a high power LF telegram to

wake-up the key inside the car. The key sends out its identification

number to the car via an ultra-high frequency (UHF) signal,

enabling the engine to start. The MLX74190 also features two built-

in Immobilizers (for ASK and FSK communications), used when the

battery of the key is depleted. In this case, the key is placed in a

specific zone close to the initiator and a full passive RFID

communication is initiated. The load modulation signal returns by

the key is received and demodulated by the MLX74190.

Figure 1: Passive Start Application

The MLX74190 can also serve for a similar purpose with other vehicles such as; motorcycles, scooters, all-

terrain vehicle (ATV), jet skis, snowmobiles and motorboats, where the key holder can be detected when

approaching the engine and will be able to activate it from a “Start” button, or as a ‘dead man switch’ so that if

the driver falls off then the engine is automatically cut. In addition it may be incorporated into building access

systems, tire pressure monitoring system (TPMS) initiators and pet identification system.

Both LF drivers are independently programmable to generate sine (max. 1Ap) or square (max. 2.5Ap) waves,

with a frequency from 109kHz to 140kHz and an output amplitude from 0.25 to 32Vpp. The two drivers can

be used in full or half bridge configuration and are protected against overload (over-current and over-

temperature). A built-in diagnosis function allows detecting any wrong connection with the LF antenna (Short

to GND, Short to Vbat, open load or wrong resonance frequency).

The MLX74190 is supplied by an external VS voltage from 6-40V and VDD voltage of typically 5V. The VS

voltage can be generated by an external DC-DC converter or by DC voltage from vehicle supply.

The MLX74190 is controlled through a standard SPI interface (SDI, SDO, SCK and NCS) and an interrupt pin

is generated on-purpose by the IC. The MLX74190 is clocked either with a 2 MHz clock frequency signal

coming from the MCU or by an on-chip oscillator connected to an external 4 MHz crystal or ceramic

resonator.

390107419001

Rev. 001

Page 1 of 14

Product Preview

Sept-2014

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与MLX74190相关器件

型号	品牌	获取价格	描述	数据表
MLX74190RPFABA-000RE	MELEXIS	获取价格	Two-Fold High Power LF Initiator With integrated Immobilizer
MLX75012	MELEXIS	获取价格	10-Channel High-Speed Universal PDIC
MLX75023	MELEXIS	获取价格
MLX75030	MELEXIS	获取价格	Universal ActiveLight Sensor Interface
MLX75030CLQAAA-000RE	MELEXIS	获取价格	Universal ActiveLight Sensor Interface
MLX75030CLQAAA-000TU	MELEXIS	获取价格	Universal ActiveLight Sensor Interface
MLX75030RLQAAA-000RE	MELEXIS	获取价格	Universal ActiveLight Sensor Interface
MLX75030RLQAAA-000TU	MELEXIS	获取价格	Universal ActiveLight Sensor Interface
MLX75031	MELEXIS	获取价格	Optical Gesture & Proximity Sensing IC
MLX75031CLQ-AAA-000-SP	MELEXIS	获取价格	IC OPTICAL PROXIMITY 24QFN

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