EM4223V3WW11E datasheet(6/29 Pages) EMMICRO

Part #	EM4223V3WW11E

Description	Read-only UHF Radio Frequency Identification Device

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Manufacturer	EMMICRO [EM Microelectronic - MARIN SA]

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EM4223

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Transponders will only transmit Data Messages to the

Reader while they are in the ROUND_ACTIVE state.

When

the

CURRENT

SLOT

NUMBER

and

the

SELECTED SLOT NUMBER values held by the

Transponder match, the Transponder transmits its Data

Message to the Reader. The Reply message will contain

either the SUID (the Integrated Circuit Manufacturer code

of 0x16 for MARIN and the lower 32 bits of the 128 bit

User Data) or the 128 bit User Data .

In situations where different groups of transponders

present in the reader field contain data having different

owners, a reader may selectively wake up these different

groups of transponders by means of the ISO compliant

AFI parameter in the Init_Round command or by using the

Mask parameter in the Begin_Round command. The

Begin_Round command additionally supports selection of

groups of transponders based on the user data content

according to the EPC™ method.

General Command Format

All commands are transmitted from the Reader to the

Transponder by means of pulse interval encoding as

defined in chapter 5: forward link encoding, beginning with

an SOF (Start Of Frame) and terminating in an EOF (End

Of Frame). Commands are supported in accordance with

the ISO 18000-6A specification which divides commands

into the categories of MANDATORY, OPTIONAL,

CUSTOM and PROPRIETARY. The EM4223 supports all

of the ISO 18000-6A MANDATORY commands and 4 of

the ISO 18000-6A OPTIONAL commands – Init_Round,

Close_Slot, New_Round and Begin_Round. In addition,

the EM4223 implements 1 PROPRIETARY command in

accordance with the ISO 18000-6A specification – this is

the Wake_Up_FST command which uses Op-Code 0x39.

Commands are divided into 2 basic types: Short

Commands of a fixed 16 bit length and Extended

commands which consist of a 16 bit section consistent

with the Short Command format followed by a variable

length extension containing various parameters and a

second CRC of 16 bit length which covers the entire

command, including the 1

st 11 bits which will already have

been covered by the 5 bit CRC and the 5 bit CRC itself.

Supported Command set

The EM4223 fully supports the four ISO MANDATORY

commands:

NEXT_SLOT,

STANDBY_ROUND,

RESET_TO_READY and INIT_ROUND_ALL.

The

ISO

OPTIONAL

commands:

INIT_ROUND,

CLOSE_SLOT, and NEW_ROUND are also supported.

The BEGIN_ROUND command is included for Supply

Chain Logistics support.

In addition to the above, the Fast Supertag

™ commands:

WAKE_UP_FST and MUTE are supported for compliance

with the FST protocol. MUTE is interpreted as any

partially decoded or invalid command as described in

section

56H56H

0.

3.

BASIC COMMAND FORMATS

There are 7 short commands, 2 extended commands and

1 implied command.

Short commands

Short commands are a fixed length of 16 bits, which

includes a 5 bit CRC. The commands comprise the

following fields:

Protocol extension – 1 bit.

Command Op-code – 6 bits.

Parameters – 4 bits (parameters could include flags).

CRC – 5 Bits.

SOF

RFU

(1 bit)

Command

Code (6 bits)

Parameters &

Flags (4 bits)

CRC-5

(5 bits)

EOF

Fig. 3 General format, Short commands

Short commands are used for collision arbitration and

other immediate functions.

Extended commands

The

EM4223

supports

2

Extended

commands

(Init_Round and Begin_Round). They comprise a fixed

length part of 16 bits, which is identical with the format of

the 16 bit Short Commands described above, followed by

an 8 bit fixed length parameter in the case of both of the

Extended commands, followed by a 2

nd parameter of

variable length up to 136 bits and terminated with a 16 bit

CRC. The Extended commands comprise the following

fields:

Protocol extension – 1 bit.

Command Op-code – 6 bits.

Parameters – 4 bits (parameters could include flags).

CRC – 5 Bits.

Extension of 8 bits (AFI) in the case of the

INIT_ROUND

command,

or

an

8

bit

(MASK_LENGTH) parameter followed by a variable

length (MASK) parameter in the case of the

BEGIN_ROUND command

CRC-16 :- 16 Bits (over full message from after the

SOF to the last bit before the CRC16 itself).

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