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ATA5551M-PPMY Datasheet(PDF) 8 Page - ATMEL Corporation

Part # ATA5551M-PPMY
Description  Standard Read/Write ID Transponder with Anti-collision
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATA5551M-PPMY Datasheet(HTML) 8 Page - ATMEL Corporation

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ATA5551M-PPMY [DATASHEET]
9334B–RFID–05/14
8
4.3
Operating the Atmel e5551
4.3.1
General
The basic functions of the Atmel® e5551 are: supply IC from the coil, read data from the EEPROM to the reader, write data
into the IC and program these data into the EEPROM. Several errors can be detected to protect the memory from being
written with the wrong data (see Figure 4-21 on page 15).
4.3.2
Supply
The Atmel e5551 is supplied via a tuned LC circuit which is connected to the Coil 1 and Coil 2 pads. The incoming RF
(actually a magnetic field) induces a current into the coil. The on-chip rectifier generates the dc supply voltage (VDD, VSS
pads). Overvoltage protection prevents the IC from damage due to high-field strengths. Depending on the coil, the open-
circuit voltage across the LC circuit can reach more than 100V. The first occurrence of RF triggers a power-on reset pulse,
ensuring a defined start-up state.
4.3.3
Read
Reading is the default mode after power-on reset. It is done by switching a load between the coil pads on and off. This
changes the current through the IC coil, which can be detected from the reader unit.
4.3.4
Start-up
The many different modes of the Atmel e5551 are activated after the first readout of block 0. The modulation is off while
block 0 is read. After this set-up time of 256 field clock periods, modulation with the selected mode starts. Any field gap
during this initialization will restart the complete sequence.
4.3.5
Read Datastream
The first block transmitted is block 1. When the last block is reached, reading restarts with block 1. Block 0, which contains
mode data, is normally never transmitted. However, the mode register is continuously refreshed with the contents of
EEPROM block 0.
Figure 4-7. Application Circuit
Figure 4-8. Voltage at Coil1/Coil2 after Power-on
Tuned LC
Reader coil
Energy
IAC
125kHz
Data
e5551
≤ 2ms
* FC → Field clocks
Power-on
Reset
Loading block 0 (256 FC ≈ 2ms)
Read data with configured
modulation and bitrate
Damping on
VCoil 1 - Coil2
Damping off


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