ATA5282_05 Datasheet, PDF (1/23 Pages) ATMEL Corporation – Ultra Low Power 125 kHz 3D - Wake-up Receiver with RSSI

Features
• Three Input Channels for 3D Antennas
• 2.8 mV_PP Sensitivity Typically
• Ultra Low Current Operation Consumption
• 2 µA Standby Current Typically
• 4 µA Active Current Typically
• Power Supply 2V to 3.8V
• Carrier Frequency Range from 100 kHz to 150 kHz
• Wake-up Function for a Microcontroller
• Header Detection
• Baud Rate up to 4 kbps (ASK Modulation)
• Bi-directional Two-wire Interface
• ESD According to Automotive Requirements
Benefits
• Digital RSSI for Field Strength Measurement
• Coils Input Range from 2.8 mV_PP to 2.8V_PP Typically
• High Sensitivity
Applications
• Passive Entry Go (PEG)/Car Access
• Position Indicator
• Home Access Control
• RFID Systems
Ultra Low Power
125 kHz 3D -
Wake-up
Receiver with
RSSI
ATA5282
1. Description
The ATA5282 is a 125-kHz ultra low power receiver IC with three input channels for
Passive Entry Go applications. It includes all circuits for an LF wake-up channel. The
three sensitive input stages of the IC amplifier demodulate and measure the input sig-
nal from the antenna coils. The microcontroller interface of the IC outputs the data
signal as well as the measured RSSI values. During standby mode, the header detec-
tion unit monitors the incoming signal and generates a wake-up signal for the
microcontroller if the IC receives a valid 125-kHz carrier signal.
By combining the IC with an antenna coil, a microcontroller, an RF transmitter/trans-
ceiver and a battery, it is possible to design a complete hands-free key for Passive
Entry Go applications.
4694E–AUTO–08/05