AS3955 datasheet(21/111 Pages) AMSCO

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[v1-01] 2015-Apr-29

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AS3955 − Detailed Description

Upon reception of a SLP_REQ command, SELECTED state is

exited and AS3955 transits to SLEEP state.

Any other command received when the device is in this state is

interpreted as an error and, depending on its previous state,

AS3955 returns to either SENSE or SLEEP state.

AUTHENTICATED State

In this state, all operations on memory blocks, which are

configured as password verification protected, can be

performed.

Upon reception of a SECTOR SELECT command, AS3955 returns

a NAK and transits to SENSE or SLEEP state, depending on its

previous state.

IUpon reception of a SLP_REQ command, AUTHENTICATED

state is exited and AS3955 transits to SLEEP state.

Any other command received when the device is in this state is

interpreted as an error and, depending on its previous state,

AS3955 returns to either SENSE state or SLEEP state.

NFC Forum Type 2 Tag Support

NFC Forum NFC-A commands ALL_REQ, SENS_REQ, SDD_REQ,

SEL_REQ, SLP_REQ are required for anti-collision. Commands

READ and WRITE are used for internal memory access. If NFC

device issues a SECTOR SELECT command, AS3955 shall always

reply with NAK.

Figure 18:

NFC-A vs ISO14443 Terminology

NFC-A Term

ISO14443 Term

States

SENSE

IDLE

SLEEP

HALT

RESOLUTION

READY

SELECTED

ACTIVE

Commands / Responses

SENS_REQ

REQA

ALL_REQ

WUPA

SENS_RES

ATQA

SSD_REQ

SEL_REQ

SELECT

SLP_REQ

HLTA

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