Datasheet

Product data sheet

COMPANY PROPRIETARY

Rev. 3.0 — 17 October 2011

213830 8 of 30

NXP Semiconductors

NTAG203

NFC Forum Type 2 Tag compliant IC with 144 bytes user memory

8.2.1 Idle state

After a Power-On Reset (POR), the NTAG203 switches directly to the idle state. It only

exits this state when a REQA or a WUPA command is received from the NFC device. Any

other data received while in the idle state is interpreted as an error and the NTAG203

remains Idle.

After a correctly executed HALT command, the halt state changes to the wait state which

can be exited with a WUPA command.

8.2.2 Ready1 state

In this state, the NTAG203 supports the NFC device when resolving the first part of its UID

(3 bytes) with the ANTICOLLISION or SELECT command from cascade level 1. This state

is exited correctly after execution of either of the following commands:

• SELECT command from cascade level 1: the NFC device switches NTAG203 into

Ready2 state where the second part of the UID is resolved.

• READ command (from address 0): all anticollision mechanisms are bypassed and

NTAG203 switches directly to the active state.

Remark: If more than one NTAG203 is in the NFC device field, a READ command from

address 0 causes a collision due to the different serial numbers and all NTAG203 devices

are selected. Any other data received in the Ready1 state is interpreted as an error and

depending on its previous state the NTAG203 returns to the wait, idle or halt state.

8.2.3 Ready2 state

In this state, the NTAG203 supports the NFC device when resolving the second part of its

UID (4 bytes) with the cascade level 2 ANTICOLLISION command. This state is usually

exited using the cascade level 2 SELECT command.

Alternatively, state Ready2 may be skipped using a READ command (from address 0) as

described in state Ready1.

Remark: If more than one NTAG203 is in the NFC device field, a READ command from

address 0 causes a collision due to the different serial numbers and all NTAG203 devices

are selected. The response of the NTAG203 to the cascade level 2 SELECT command is

the Select Acknowledge (SAK) byte. In accordance with ISO/IEC 14443 this byte

indicates if the anticollision cascade procedure has finished. It also defines the type of

device selected for the MIFARE architecture platform. The NTAG203 is now uniquely

selected and only this device will communicate with the NFC device even when other

contactless devices are present in the NFC device field. Any other data received when the

device is in this state is interpreted as an error and depending on its previous state the

NTAG203 returns to the wait, idle or halt state.

8.2.4 Active state

In the active state either a 16-byte READ or 4-byte WRITE command can be performed.

The HALT command exits either the READ or WRITE commands in their active state. Any

other data received when the device is in this state is interpreted as an error and

depending on its previous state the NTAG203 returns to the wait, idle or halt state.