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Teilenummer | U3280M |
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Beschreibung | Transponder Interface | |
Hersteller | ATMEL Corporation | |
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Gesamt 21 Seiten 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
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 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
12 Page | ||
Seiten | Gesamt 21 Seiten | |
PDF Download | [ U3280M Schematic.PDF ] |
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