PN544 데이터 시트보기 (PDF) - NXP Semiconductors.

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PN544

Near field communication (NFC) controller

NXP Semiconductors. 

www.DataSheet.co.kr

NXP Semiconductors

PN544

Near field communication (NFC) controller

9.1.1.3 Active reader/writer mode

In this mode PN544 generates RF field and thus has maximum power consumption. This

mode is possible only if sufficient energy from phone battery is available.

This mode can be entered automatically by PN544 in polling mode, appropriate host

configuration is needed.

The PN544 features integrated DC/DC converter in order to ensure 3 V on transmitter

path to keep same RF distance performance even when the battery level goes below 3 V.

Fig 10. Functional power modes

9.1.2 Hardware power modes

Additionally, PN544 has two HW power modes which are not configurable by software and

depend solely on HW signals and voltage levels.

9.1.2.1 Hard power-down mode

PN544 is set to hard power-down mode by host via VEN pin. If enabled, Powered by the

field mode is possible upon RF field entry. No voltage monitoring is performed in this

mode. No autonomous recovery from this mode is possible.

9.1.2.2 Monitor mode

In this mode phone battery voltage is below fixed1 threshold. All interfaces are turned off

for power savings, but battery voltage is still monitored. Only dedicated low-power circuitry

is powered in this mode. Until phone battery voltage raises above critical threshold no

recovery by host is possible. Powered by the field is possible if configured by host.

1. Threshold voltage is a hardware feature and can be changed in different product versions.

134812

Objective short data sheet

Rev. 1.2 — 4 September 2007

© NXP B.V. 2007. All rights reserved.

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