NXP Semiconductors
UM11061
User Manual PN7150X
UM11061
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User manual
Rev. 1.2 — 11 July 2018
COMPANY PUBLIC
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2 Additions to PN7150
PN7150
X
implements all PN7150 features. On top of that it adds support for Apple
Enhanced Contactless Polling allowing to enable compatibility with Apple watch.
2.1 Apple Enhanced Contactless Polling support
PN7150
X
implements Apple Enhanced Contactless Polling inserting the VASUP-A
command right after Type A passive poll phase of the NFC Forum discovery loop.
PN7150 implements NFC-A Bail-out option (refer to NCI Forum Activity,
Section 3
),
implying VASUP-A command being only sent out if no answer to the SENS_REQ is
observed.
The PN7150
X
will ignore any response to the VASUP-A command and will continue with
the next phase of the polling loop.
Below picture describes PN7150
X
behavior with respect to NFC Forum activity defined
Technology Detection Activity flow chart:
Figure 1. Updated Technology Detection Activity flow chart
As described in above flow chart, the Apple Enhanced Contactless Polling is only
handled when Type A polling is activated. When enabled, the VASUP-A command is
inserted approximately 780µs after the Type A initial request (SENS_REQ).