MLX74190 Two-Fold High Power LF Initiator With integrated Immobilizer Features Application Examples 2 High power independent drivers Passive Start system (2.5Apeak in square and 1Apeak in sine TPMS Initiator mode) LF door opener Full bridge drive capabilities Active RFID initiator Built-in protection features (antenna fault detection, over current and T) for safe operation in all conditions Easy-to-use through SPI interface Built-in ASK and FSK immobilizers Ordering Information Option Part Code Temperature Code Package Code Packing Form Code Code MLX74190 R (-40C to 105C) PF (Lead free TQFP 7x7 48 leads) ABA-000 RE 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. REVISION 004 - JUNE 20, 2017 3901074190 MLX74190 Two-Fold High Power LF Initiator With integrated Immobilizer Contents Features .................................................................................................................................................... 1 Application Examples ................................................................................................................................ 1 Ordering Information ................................................................................................................................ 1 Description ................................................................................................................................................ 1 1. Absolute Maximum Ratings ................................................................................................................... 5 2. Range of Functionality ........................................................................................................................... 5 3. Pin out description ................................................................................................................................ 6 4. High Level Block Diagram ...................................................................................................................... 8 5. Operating Modes ................................................................................................................................... 9 5.1. Sleep Mode ......................................................................................................................................... 9 5.2. Standby Mode ..................................................................................................................................... 9 5.3. Transmission Mode ............................................................................................................................ 9 5.4. Diagnosis Mode................................................................................................................................... 9 6. Detailed Description ............................................................................................................................ 10 6.1. Power supplies, internal regulation and references ....................................................................... 10 6.2. System clock ...................................................................................................................................... 11 6.3. LF transmission chain ....................................................................................................................... 12 6.3.1. Frequency generation ................................................................................................................ 12 6.3.2. Sine wave generation ................................................................................................................. 13 6.3.3. Square wave generation ............................................................................................................. 14 6.3.4. Phase Generation ....................................................................................................................... 14 6.3.5. Selection of modulation source ................................................................................................. 14 6.3.6. Modulator ................................................................................................................................... 15 6.3.7. Transmission of destroy bits ...................................................................................................... 15 6.3.8. LF Driver outputs ........................................................................................................................ 16 6.3.9. Electrical parameters .................................................................................................................. 16 6.4. Immobilizer Function ........................................................................................................................ 17 6.4.1. ASK demodulation ...................................................................................................................... 17 6.4.2. FSK demodulation ....................................................................................................................... 19 6.4.3. Electrical parameters .................................................................................................................. 20 6.5. Digital SPI Interface ........................................................................................................................... 21 REVISION 004 - JUNE 20, 2017 3901074190 Page 2 of 62