Features
• SPI for Microcontroller Connection with Up to 1 Mbit/s
Internal Data Buffer for Timing-independent Data Transmission
Programmable Driver Current Regulation
One-chip Antenna Driver Stage for 1 A Peak Current
LF Baud Rates Between 1 kbaud and 4 kbaud
Quick Start Control (QSC) for Fast Oscillation Build-up and Decay Timing
Integrated Oscillator for Ceramic Resonators
Power Supply Range from 7.5 V to 16 V Direct Battery Input
(Up to 28 V With Limited Function Range)
Amplitude Shift Keying (ASK) Modulation
Phase Shift Keying (PSK) Modulation
Carrier Frequency Range from 100 kHz to 150 kHz
Operational Temperature -40°C to +105°C
EMI and ESD According to Automotive Requirements
Highly Integrated — Less External Components Required
Applications
Hands-free Car Access (Passive Entry/Go)
Tire Pressure Measurement
Home Access Control
Care Watch Systems
Benefits
Diagnosis Function and Overtemperature Protection
Load Dump Protection Up to 45 V for 12 V Boards
Power-down Mode for Minimum Power Consumption
Electrostatic sensitive device.
Observe precautions for handling.
Description
The ATA5278 device is an integrated BCDMOS antenna driver IC dedicated as a
transmitter for Passive Entry/Go (PEG) car applications and for other hands-free
access control applications.
It includes the full functionality of generating a magnetic LF field in conjunction with an
antenna coil to transmit data to a receiver in a key fob, card or transponder. A micro-
controller can access the chip via a bi-directional serial interface.
Stand-alone
Antenna Driver
ATA5278
Preliminary
Rev. 4832A–RKE–10/04