U3280M Datasheet, PDF (1/18 Pages) ATMEL Corporation – TRANSPONDER INTERFACE FOR MICROCONTROLLER

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
Transponder
Interface for
Microcontroller
U3280M
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.
Figure 1. Block Diagram
Energy
Data
Coil 1
Coil 2
U3280M Transponder Interface
VField
regulator
Power
management
Damping
stage
Rectifier
512-bit
EEPROM
memory
Field/gap
detect
Serial
interface
Clock
extractor
>_1
Bi-phase
modulator
FC ^{NGAP MOD}
VBatt
NRST
VDD
Sensors, keys, displays, actuators
Low power
microcontroller
SDA
SCL
VSS
Transmit data
Receive data/field detected
Field clock
Rev. 4688B–RFID–12/04