User's Manual

U
M10936
P
N7150 User Manual
UM
10936 All information provided in this document is subject to legal disclaimers.
U
ser manual
CO
MPANY PUBLIC
Rev. 2.0 — 6 November 2020
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• PN
7150 is in state RFST_W4_ALL_DISCOVERIES, it sends an RF_DISCOVER_NTF
to the DH for VICC2 and moves to RFST_W4_HOST_SELECT.
• PN
7150 is in state RFST_W4_ALL_DISCOVERIES and waits for the DH to select one
of the 2 VICCs. Once it receives the RF_DISCOVER_SELECT_CMD from the DH,
PN7150 immediately activates the Frame RF Interface and does not check if the selected
V
ICC is still in the field. That means that PN7150 will not send a
CO
RE_GENERIC_ERROR_NTF (Discovery_Target_Activation_Failed) to the DH if the
selected VICC is not in the field anymore. The state is now changed to
RFST_POLL_ACTIVE.
• PN
7150 is in state RFST_POLL_ACTIVE; it waits for the DH to send some data to
transfer over RF. Once it gets this data, PN7150 forwards it over RF. If the selected VICC
is not in the field anymore, PN7150 will stay mute and will not send any data back to the
DH. The DH has to implement a time-out function, to detect that the VICC is not in the
field anymore. Once this timeout is triggered, the DH can de-activate the Frame RF
Interface by sending the RF_DEACTIVATE_CMD.
6.5 [PN7150-NCI] extension: KOVIO tags
K
ovio tags are very particular tags which use a sub-set of NFC-A technology.
The basic concept is that the tag is powered from RF Field generated by PN7150, and it
will spontaneously generate a 16-Byte ID using NFC-A load modulation, although it did not
receive any command from PN7150. Once PN7150 has detected a Kovio tag by capturing
its ID, PN7150 will send a RF_INTF_ACTIVATED_NTF, transporting the tag ID as RF
parameter.
T
able 65. Kovio specific RF parameters inside the RF_INTF_ACTIVATED_NF
Payload Field(s) Length Value/Description
…
Lengt
h of RF Technology Specific Parameters 1 Octet 16
R
F Technology Specific Parameters 16 Octets Kovio ID
…
I
t is then up to the DH to decide when to leave the RFST_POLLING_ACTIVE state, and
also to decide if it directly comes back to RFST_DISCOVERY, where the same Kovio Tag
may be discovered again, or if it comes back to RFST_IDLE first, in order to wait without
any RF activity or re-configuring the RF Discovery so that PN7150 does not poll for a Kovio
tag again.
Kovio tags are accessed through the [NCI] Frame RF Interface.
Due to the very particular behavior of the Kovio tags, it is necessary to configure the RF
Discovery specifically for these tags, using the NFC-A_KOVIO_POLL_MODE parameter
for the RF_DISCOVER_CMD as highlighted in the table below: