User's Manual

Table Of Contents
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. 2.06 November 2020
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75 of 127
15693
NFC-F
@212
NFC-B
NFC-A
NFC-A
Active
Polling phase
Listening phase
NFC-F
@424
Fig 37. RF Discovery sequence in case of NFC FORUM+ profile
N
ote: the transition from the Poll NFC-A Active phase to the Poll NFC-A (passive) is done
t
hrough an RF field off/on sequence.
F
or more details concerning the different phases duration, guard time, Bailout, please refer
to the configuration section (chapter10.2) where all these parameters are defined.
9.4 [PN7150-NCI] extension: Low Power Card Detector (LPCD) Mode
9.
4.1 Description
T
he Low Power Card Detector is an NXP proprietary extension, which can be used by the
DH to reduce the power consumption.
The concept is to avoid using the Technology Detection Activity as defined in [ACTIVITY],
which implies to generate an RF Field for several tens of milliseconds and to send
technology specific request commands to see if there is a Card/Tag in the field to respond.
The more technologies the PN7150 is configured to detect, the longer the RF Field is
generated and the higher the current consumption.
The LPCD is based on another concept, which only relies on the antenna characteristics,
not on valid responses from a Card/Tag. Indeed, the antenna impedance is influenced by
the Card/tag which may enter into its proximity, due to the magnetic coupling between the