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U3280M Schematic ( PDF Datasheet ) - ATMEL Corporation

Teilenummer U3280M
Beschreibung Transponder Interface
Hersteller ATMEL Corporation
Logo ATMEL Corporation Logo 




Gesamt 21 Seiten
U3280M Datasheet, Funktion
Features
Contwacwtwle.DsastaPSohweeetr4SUu.cpomply 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
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.
4688D–RFID–03/07






U3280M Datasheet, Funktion
4. U3280M Signals and Timing
www.DataSheet4U.com
Figure 4-1. Modulation
MOD
Coil inputs
VCMS
VCD
VCU
Figure 4-2. GAP and Modulation Timing
Gap detection and battery to field switching
VFDON
Coil inputs
t FGAP1
t FGAP0
1. edge used as wakeup signal
NGAP
Field clock FC
Power
management Battery supply
t BFS Coil supply if automatically power management is enabled
V FDOFF
tFBS
Battery
supply
4.1 Digital Output of the Gap-detection Stage (NGAP)
NGAP = 0: gap detected/no field
Vcoil-peak = VFDoff
NGAP = 1: field detected
Vcoil-peak = VFDon
Note: No amplifier is used in the gap-detection stage. A digital Schmitt trigger evaluates the rectified and
smoothed coil voltage.
4.2 Wake-up Signal
If a field is applied at the coil of the transponder interface, the microcontroller can be woken up
with the wake-up signal at the NGAP pin. For that purpose, the NGAP pin must be connected to
an interrupt input of the microcontroller. A high level at the NGAP output indicates an applied
field and can be used as a wake-up signal for the microcontroller via an interrupt. The wake-up
signal is generated if power management switches to field supply. The field-detection stage of
the power management has lowpass characteristics to avoid generating wake-up signals and
unnecessary switching between battery and field supply in case of interferences at the coil
inputs.
6 U3280M
4688D–RFID–03/07

6 Page









U3280M pdf, datenblatt
5.2.2.1
Read One Data Byte
www.DataSheet4U.com
START
Control byte A Data byte 1 N STOP
5.2.2.2
Read Two Data Bytes
5.2.2.3
START
Read n Data Bytes
Control byte A Data byte 1 A Data byte 2 N STOP
5.2.2.4
START Control byte A Data byte 1 A Data byte 2 A - - - - - - Data byte n N STOP
A acknowledge, N no acknowledge
Read Control Bytes
Read Low Byte First, Address Increment
MSB
A4 A3 A2 A1 A0 C1
Row address
0
LSB
C0 R/NW
11
Byte Order
LB(R) HB(R)
LB(R+1) HB(R+1) - - - -
LB(R+n) HB(R+n)
5.2.3
Read High Byte First, Address Decrement
MSB
A4 A3 A2 A1 A0 C1
Row address
1
LSB
C0 R/NW
01
Byte Order
HB(R) LB(R) HB(R-1) LB(R-1)
HB: high byte; LB: low byte; R: row address
----
HB(R-n) LB(R-n)
Initialization after a Reset Condition
The EEPROM with the serial interface has reset circuitry on-chip. In systems with microcontrol-
lers that have their own reset circuitry for power-on reset, watchdog reset or brown-out reset, it
may be necessary to bring the U3280M into a known state independently of the internal reset.
This is performed by reading one byte without acknowledging and then generating a STOP
condition.
12 U3280M
4688D–RFID–03/07

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