Features
• Contactless Power Supply and Communication Interface
• Up to 10 kbaud Data Rate (R/O)
• Power Management for Contactless and Battery Power Supply
• Frequency Range 100 kHz to 150 kHz
• 32 x 16-bit EEPROM
• Two-wire Serial Interface
• Shift Register Supported Bi-phase and Manchester Modulator Stage
• Reset I/O Line
• Field Clock Extractor
• Field and Gap Detection Output for Wake-up and Data Reception
• Field Modulator with Energy-saving Damping Stage
Applications
• Main Areas
– Access Control
– Telemetry
– Wireless Sensors
• Examples:
– Wireless Passive Access and Active Alarm Control for Protection of Valuables
– Contactless Position Sensors for Alignments of Machines
– Contactless Status Verification and/or Data Readout from Sensors
1. Description
The U3280M is a transponder interface for use in contactless ID systems, remote con-
trol systems, tag and sensor applications. It supplies the microcontroller with power
from an RF field via an LC-resonant circuit and it enables contactless bi-directional
data communication via this RF field. It includes power management that handles
switching between the magnetic field and a battery power supply. To store permanent
data like an identifier code and configuration data, the U3280M includes a 512-bit
EEPROM with a serial interface.
Transponder
Interface for
Microcontroller
U3280M
4688D–RFID–03/07
