HTSICH56_48_SDS All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product short data sheet
COMPANY PUBLIC
Rev. 3.1 — 11 December 2014
210331 7 of 21
NXP Semiconductors
HTSICH56; HTSICH48
HITAG S transponder IC
7.4 State Diagram
7.4.1 General Description of States
Power Off
The powering magnetic field is switched off or the HITAG S Transponder is out of field.
Ready
After start up phase, the HITAG S Transponder is ready to receive the first command.
Init
The HITAG S Transponder enters this State after the first UID REQUEST xx command. In
this State the Response Protocol Mode (see Section 7.5
) may be changed by further
UID REQUEST xx commands. If there are several HITAG S Transponders in the field of
the RWD antenna at the same time, the AC SEQUENCE can be started to determine the
UID of every HITAG S Transponder.
Authenticate
The HITAG S Transponder enters this State after a valid SELECT (UID) command when
configured in Authentication Mode. After an encrypted CHALLENGE Authentication the
HITAG S Transponder changes into the Selected State.
Selected
The HITAG S Transponder enters this State after a valid SELECT (UID) command when
configured in Plain Mode or a SELECT (UID) and CHALLENGE sequence when
configured in Authentication Mode. Only one HITAG S Transponder in the field of the
RWD antenna can be Selected at the same time. In this State, Read and Write operations
are possible. Data Transmission is not encrypted even if configured in Authentication
Mode.
Quiet
The HITAG S Transponder enters this State after a SELECT_QUIET (UID) command in
Init State or a QUIET command in Selected State. In this State, the HITAG S Transponder
will not answer to any command. Switching off the powering magnetic field or moving the
HITAG S Transponder out of field enters it into the Power Off State.
Transponder Talks First (TTF)
The HITAG S Transponder enters this State when configured in TTF Mode if no
UID REQUEST xx command is received within the Mode switch window. Once entered
this State, the HITAG S Transponder continuously transmits data with configurable data
coding, data rate and data length.
