NXP Semiconductors PN7150X - Additions to PN7150; Apple Enhanced Contactless Polling support

NXP Semiconductors
UM11061
User Manual PN7150X
UM11061 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2018. All rights reserved.
User manual Rev. 1.2 — 11 July 2018
COMPANY PUBLIC 433812 4 / 10
2 Additions to PN7150
PN7150X 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
PN7150X 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 PN7150X will ignore any response to the VASUP-A command and will continue with
the next phase of the polling loop.
Below picture describes PN7150X 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).