EM4056B6CB2RC 데이터 시트보기 (PDF) - EM Microelectronic - MARIN SA

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EM4056B6CB2RC

2KBIT Read/Write with ANTICOLLISION Contactless Identification Device

EM Microelectronic - MARIN SA 

EM4056

Arbitration commands

The arbitration mode is a sophisticated command avoiding collisions among transponders. The arbitration method is based

on the method of multiprocessor bus arbitration.

This feature allows the identification of a transponder out of a group, even if they entered the electromagnetic field at the

same time. At each arbitration, the reader detects one address of a new transponder.

The arbitration session starts with a special StartArbitration command. If the RdEn bit of the transponder is « 0 », then the

transponder belongs to the active group. The arbitration commands will only act on the transponders of the active group.

StartArbitration

After the Start bit, the reader sends a command field which indicates the beginning of an arbitration cycle. An 8 bits CRC

block calculated over the StartArbitration command completes this information.

The transponder returns the first BitVal frame corresponding to the LSB of its 32 bits addresses.

Start of arbitration

1 bit

Reader Start

4 bits

MSB

Start_Arbit

8 bits

MSB

CRC

Transponder

6 bits

Bit0 Bit0 X X Bit1 Bit1

ta1p

LSB ROM

ta2p

1 bit 2 bits

MSB

Start Continue

Fig. 17

BitVal Frame

The BitVal frame consists of 6 bits. If the Nth bit of its address is logic « 0 », the transponder sends two « 0 » at the position

Bit0. If the Nth bit of its address is logic « 1 », the transponder sends two « 0 » at the positions Bit1. The bit repetition

increases the transmission reliability.

The response value of the different transponders is coded with the time position of the answer. Therefore no answer

conflicts are generated.

Note: Reception Bit Period is 32 RFclocks for all the arbitration (BitVal frame and CRC).

BitVal frame

Bit0

Bit0

X

Å 32 Rf period Æ

X

Bit1

Bit1

BitVal = 0

0

0

X

X

X

X

BitVal = 1

X

X

X

X

0

0

Fig. 18

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