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PDF MLX74190 Data sheet ( Hoja de datos )
| Número de pieza | MLX74190 | |
| Descripción | Two-Fold High Power LF Initiator | |
| Fabricantes | Melexis | |
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MLX74190
Two-Fold High Power LF Initiator
With integrated Immobilizer
Features and Benefits
2 High power independent drivers (2.5Apeak in
square and 1Apeak in sine mode)
Full bridge drive capabilities
Built-in protection features (antenna fault detection,
over current and T°) for guaranteed safe operation
in all conditions
Easy-to-use through SPI interface
Built-in ASK and FSK immobilizers
Application Examples
Passive Start system
TPMS Initiator
LF door opener
Active RFID initiator
Ordering Information
Part Code Temperature Code
MLX74190 R (-40°C to 105°C)
Package Code
PF (Lead free TQFP 7x7 48 leads)
Option
Code
ABA-000
Packing Form
Code
RE
This document is a Product Preview, to get access to the full datasheet and related documentations, please directly
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
1 page  
MLX74190
Two-Fold High Power LF Initiator
With integrated Immobilizer
FSK_RX2
FSK_FB2
IP_SENSE
RBIAS
EXT_CLK
CLK_IN
OSC
OUT1
GND
VS
OUT2
CLK_OUT
1
2
3
4
5
6
7
8
9
10
11
12
36 VDD
35 n.c.
34 n.c.
33 n.c.
32 n.c.
31 n.c.
30 n.c.
29 n.c.
28 n.c.
27 n.c.
26 n.c.
25 AGND
Table 4: Top view of the package TQFP48
390107419001
Rev. 001
Page 5 of 14
Product Preview
Sept-2014
5 Page 
MLX74190
Two-Fold High Power LF Initiator
With integrated Immobilizer
1 Package and marking information
1.1 Package data TQFP eP 48L (7x7, 48 leads)
A A1 A2 b b1 D D1 D2 E E1 E2 e L N ccc ddd
Min - 0.05 0.95 0.17 0.17 9.00 7.00 4.00 9.00 7.00 4.00 0.50 0.45 48 -
-
Nom -
- 1.00 0.22 0.20
0.60 - -
Max 1.20 0.15 1.05 0.27 0.23
0.75
0.08 0.08
Notes:
1. All Dimensioning and Tolerances conform to ASME Y14.5M-1994,
Δ2. Datum Plane [-|-|-] located at Mould Parting Line and coincident with Lead, where Lead exists, plastic body at bottom of parting line.
Δ3. Datum [A-B] and [-D-] to be determined at centreline between leads where leads exist, plastic body at datum plane [-|-|-]
Δ4. To be determined at seating plane [-C-]
Δ5. Dimensions D1 and E1 do not include Mould protrusion. Dimensions D1 and E1 do not include mould protrusion. Allowable mould protrusion is 0.254 mm on D1 and E1 dimensions.
6. 'N' is the total number of terminals
Δ7. These dimensions to be determined at datum plane [-|-|-]
8. Package top dimensions are smaller than bottom dimensions and top of package will not overhang bottom of package.
Δ9. Dimension b does not include dam bar protrusion, allowable dam bar protrusion shall be 0.08mm total in excess of the "b" dimension at maximum material condition, dam bar can not
be located on the lower radius of the foot.
10. Controlling dimension millimetre.
11. maximum allowable die thickness to be assembled in this package family is 0.38mm
12. This outline conforms to JEDEC publication 95 Registration MS-026, Variation ABA, ABC & ABD.
Δ13. A1 is defined as the distance from the seating plane to the lowest point of the package body.
Δ14. Dimension D2 and E2 represent the size of the exposed pad. The actual dimensions are specified ion the bonding diagram, and are independent from die size.
15. Exposed pad shall be coplanar with bottom of package within 0.05.
Exposed pad need best
possible contact to ground for
exlectrical and thermal reasons
390107419001
Rev. 001
Page 11 of 14
Product Preview
Sept-2014
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| MLX74190 | Two-Fold High Power LF Initiator | Melexis |
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