Product Summary

The ATA5279N is an LF coil driver IC intended for passive entry/-go (PEG) systems. The ATA5279N can drive up to six low-frequency-antennas (i.e., coils) to provide a wake-up and initialization channel to the key fob.

Parametrics

ATA5279N absolute maximum ratings: (1)Voltage range on pin VS VVS: –0.3 to 40 V; (2)Voltage range on pins VDSx, VLx VVDS,max: –0.3 to 46 V; (3)Voltage range on pins AxP VAxP,max: –0.3 to VVDS + 0.3 V; (4)Voltage range on pins VSHFx, VSHS VVSHF,max: –3 to VVCC + 0.3 V; (5)Voltage range on pins AxNx VAxNx,max VVSHF: – 0.3 to 46 V; (6)Voltage range on pins VCC, VIF VDIGSUP,max: –0.3 to +5.5 V; (7)Voltage on pins RGND, PGNDx VGND,max –0.3 to +0.3 V; (8)Voltage range on pins NRES, S_CS, S_CLK, MOSI, OSCI, MACT, BCNT, IRQ, MISO, OSCO VIO,max: –0.3 to VVIF + 0.3 V; (9)Voltage range on pin CINT VCINT,max: –0.3 to VVCC + 0.3 V; (10)ESD Voltage Ratings - HBM (MIL-STD-883F, M. 3015.7)VESD: 2 kV; (11)Maximum average junction temperature Tj.max: 150 °C.

Features

ATA5279N features: (1)Six Connections for Series-resonant LF Coil Antennas; (2)Drives up to 1A Peak Current on the First Three Channels and up to 700 mA Peak on the Second Three, Largely Independent of the Battery Voltage; (3)On-off-keyed Data Modulation with up to 6 kbit/s; (4)Sinusoidal-like Output Signal for Superior EMC Behavior; (5)20 Selectable Steps for Current Regulation for Field Strength Measurement (RSSI); (6)Output Driver Stages are Protected Against Electrical and Thermal Overload; (7)Very Low Power-down Current Consumption; (8)SPI Interface for Easy Microcontroller Bus Connection; (9)LF Data Buffer to Minimize Microcontrollers CPU Load During a Data Transmission; (10)Small Outline Package: QFN48, 7 mm × 7 mm.

Diagrams

ATA5279N pin connection 

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