PN544 데이터 시트보기 (PDF) - NXP Semiconductors.

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PN544

Near field communication (NFC) controller

NXP Semiconductors. 

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NXP Semiconductors

PN544

Near field communication (NFC) controller

9.2 PN544 Supply

This controller is supplied with two different supply voltages: VI/O and VBAT. This ensures

independence between contactless core, supplied by VBAT, and interface with baseband,

supplied by VI/O.

VBAT supply is either connected directly to the phone battery or to LDO from host PMU.

Depending on connection, PN544 can be configured to operate without host presence or

even without battery presence.

With optional Powered by the field antenna matching circuit, PN544 can be operated

without battery present. PN544 detects field entry automatically and can, as long sufficient

energy is provided by the field2, operate autonomously and supply phone SIM or separate

secure element connected via NFC-WI.

9.3 Supply of a secure element

PN544 provides integrated PMU to ensure supply voltage for both secure elements

connected via SWP or NFC WI interface.

9.3.1 Supply of SIM with SWP interface

According to ETSI SWP specification, NFC controller can be the source of SIM supply

(VCC pin). PN544 will offer this possibility wherever the SIM power comes from (PMU,

battery, field).

In case SIM supply is routed via PN544, it will supply the SIM if configured so by host in

active battery mode or if SIM is needed by PN544 in all other modes.

The PN544 will route the SIM supply from the host PMU without taking care of the voltage

ramp, it is in host responsibility to ensure that SIM supply is according to current

standards. PN544 will support Class B voltage range providing 50 mA and Class C

voltage range providing 30 mA.

Class A is not supported.

9.3.2 Supply of secure element connected over NFC-WI

A switch is implemented to control power supply of secure element connected via

NFC-WI. Only Class C voltage range is supported for secure element connected via

NFC-WI.

2. This is highly dependent on distance to reader, antenna geometry, matching circuit used and phone integration constraints.

134812

Objective short data sheet

Rev. 1.2 — 4 September 2007

© NXP B.V. 2007. All rights reserved.

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