ATA5279 Datasheet, PDF (1/35 Pages) ATMEL Corporation – Antenna Driver for Multiple Antennas

Features
• 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 × 7 mm
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. Block Diagram
VS
VCC
VL PGND
VDS
Antenna Driver
for Multiple
Antennas
ATA5279
Preliminary
OSCI
OSCO
Oscillator
Internal Supply
POR, BG, UV/OV
Boost
Controller
DC
DC
HP 1-3
A1P
A2P
A3P
S_CS
S_CLK
SPI
MOSI
MISO
LF Data Buffer
Sine Wave
Generator
LP 1-3
A4P
A5P
A6P
VIF
NRES
IRQ
BCNT
MACT
Control Logic
Communication
Protocol Handling
Driver Stage
Control
GND
Reference
RGND
Integrator
Sample
and Hold
Return Line
Driver
Zero Cross
Detector
A1N
A2N
A3N
A4N
A5N
A6N
VSHF
CINT VSHS
9125B–RKE–12/08