AS3955 datasheet(21/102 Pages) AMSCO

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ams Datasheet

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[v1-04] 2016-Feb-03

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AS3955 − Detailed Description

Figure 17:

AS3955 State Diagram

SENSE State

After a power-on reset (POR), AS3955 switches to the SENSE

state. This state is exited when a SENS_REQ or an ALL_REQ

command is received from the NFC device. Any other data

received while in this state is interpreted as an error and AS3955

remains in SENSE state.

When in SELECTED or AUTHENTICATED state, a correctly

executed SLP_REQ command will modify the default waiting

state from SENSE to SLEEP state. SLEEP state can be exited when

an ALL_REQ command is received.

POWER OFF

(RF field off)

SENSE

SLEEP

AUTHENTICATED

Reset

ALL_REQ

SENS_REQ

ALL_REQ

WRITE

Authentication Password

READ (16 bytes)

WRITE (4 bytes)

GET VERSION

RESOLUTION

ANTI-COLLISION

SEL_REQ

SLP_REQ

SELECTED

READ (16 bytes)

WRITE (4 bytes)

GET VERSION

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