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PDF U3280M Data sheet ( Hoja de datos )
| Número de pieza | U3280M | |
| Descripción | Transponder Interface | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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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
1 page  
U3280M
3.2.1 Digital Input to Control the Damping Stage (MOD)
w w w . D a t a S Mh OeDe=t04: cUoil.ncotodammped
Vcoil-peak = VDD × 2 + VCMS = VCU
MOD = 1: coil damped
Vcoil-peak = VDD × 2 = VCD
VCMS = VCID: modulation voltage stroke at coil inputs
Note: If the automatic power management is disabled, the internal front-end VDD is limited at VDDC. In
this case the value VDDC must be used in the above formula.
3.3 Field Clock
The field clock extractor of the interface makes the field clock available for the microcontroller. It
can be used to supply timer inputs to synchronize modulation and demodulation with the field
clock.
3.4 Gap Detect
The transponder interface can also receive data. The base station modulates the data with short
gaps in the field. The gap-detection circuit detects these gaps in the magnetic field and outputs
the NGAP/field signal at the NGAP pin. A high level indicates that a field is applied at the coil
and a low level indicates a gap or that the field is off. The microcontroller must demodulate the
incoming data stream at one of its inputs.
4688D–RFID–03/07
5
5 Page 
U3280M
5.2.1.1
Write One Data Byte
www.DataSheet4U.com
START
5.2.1.2
Write Two Data Bytes
Control byte
A Data byte 1
A STOP
5.2.1.3
START Control byte A Data byte 1 A Data byte 2 A STOP
Write Control Byte Only
5.2.1.4
START Control byte
A →acknowledge
A STOP
Write Control Bytes
Write Low Byte First
MSB
LSB
A4 A3 A2 A1 A0 C1 C0 R/NW
Row address
01 0
Byte Order
LB(R)
HB(R)
5.2.2
Write High Byte First
MSB
LSB
A4 A3 A2 A1 A0 C1 C0 R/NW
Row address
10 0
Byte Order
HB(R)
LB(R)
HB: high byte; LB: low byte; R: row address
Read Operations
The EEPROM allows byte-, word- and current address read operations. The read operations are
initiated in the same way as write operations. Each read access is initiated by sending the
START condition followed by the control byte which contains the address and the read mode.
When the device has received a read command, it returns an acknowledge, loads the addressed
word into the read/write buffer and sends the selected data byte to the master. The master has
to acknowledge the received byte to proceed with the read operation. If two bytes are read out
from the buffer, the device automatically increments or decrements the word address and loads
the buffer with the next word. The read mode bit determines if the low or high byte is read first
from the buffer and if the word address is incremented or decremented for the next read access.
When the memory address limit has been reached, the data word address will “roll over” and the
sequential read will continue. The master can terminate the read operation after every byte by
not responding with an acknowledge (N) and by issuing a STOP condition.
4688D–RFID–03/07
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet U3280M.PDF ] | |
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