ATA5279 ATMEL Corporation, ATA5279 Datasheet

ATA5279

Manufacturer Part Number

ATA5279

Description

Manufacturer

ATMEL Corporation

Datasheet

1.ATA5279.pdf (35 pages)

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Features

•

1. Description

The ATA5279 is an LF coil driver IC intended for passive entry/-go (PEG) systems. It

can drive up to six low-frequency-antennas (i.e., coils) to provide a wake-up and ini-

tialization channel to the key fob.

Figure 1-1.

S_CLK

OSCO

MACT

NRES

BCNT

S_CS

MOSI

MISO

OSCI

Six Connections for Series-resonant LF Coil Antennas

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

On-off-keyed Data Modulation with up to 6 kbit/s

Sinusoidal-like Output Signal for Superior EMC Behavior

20 Selectable Steps for Current Regulation for Field Strength Measurement (RSSI)

Full Protection Against Overload (Electrical and Thermal)

Very Low Power-down Current Consumption

SPI Interface for Easy Microcontroller Bus Connection

LF Data Buffer to Minimize Microcontroller’s CPU Load During a Data Transmission

Small Outline Package: QFN48, 7 mm

IRQ

VIF

Oscillator

GND

SPI

Protocol Handling

Block Diagram

Communication

Control Logic

POR, BG, UV/OV

Internal Supply

LF Data Buffer

Driver Stage

Reference

Control

RGND

VCC

7 mm

Sine Wave

Generator

Controller

Integrator

and Hold

Sample

Boost

PGND

CINT

VSHS

Return Line

Zero Cross

Detector

HP 1-3

LP 1-3

Driver

VDS

A1P

A2P

A3P

A4P

A5P

A6P

A1N

A2N

A3N

A4N

A5N

A6N

VSHF

Antenna Driver

for Multiple

Antennas

ATA5279

Preliminary

9125A–RKE–04/08

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