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. Power supply

Main idea behind PN544’s power concept is full host control over both PN544’s power

consumption and active communication modes. This controller is designed to adapt his

current consumption to the available system energy and host controlled configuration.

As long as host controller is on, it has full control over PN544’s behavior and indirectly

over it’s current consumption.

With host controller turned off, PN544 makes it’s power state dependent on battery

voltage, HW configuration pins and internal software configuration.

9.1 Power modes

Different power modes are implemented in order to optimize phone battery and

contactless performance depending on the mobile state and battery charge status.

Without host control PN544 acts autonomously based on SW pre-configuration, battery

charge status and RF field existence.

With active host control and/or according system integration PN544 can be forced to low

power mode, limiting its communication capabilities but also minimizing impact on phone

battery life.

If sufficient energy is provided by RF field, in host controlled power down mode PN544

reduces current consumption from battery to minimum without limiting its communication

capabilities in UICC emulation mode.

9.1.1 Functional power modes

From the system point of view and only with according SW configuration, PN544 supports

following functional power modes (see also Figure 10):

9.1.1.1 Active mode

This mode can be either battery (Active BAT) or antenna (Active ANT) supplied. All card

emulation modes configured by the host are allowed in this mode. In this mode, all PN544

modules are powered.

This is also the default mode for PN544. Note that the current consumption in this mode

can vary depending on operation executed.

9.1.1.2 Standby mode

Standby mode is used to save energy when battery is still available for PN544. This mode

is trade-off between functionality and current consumption and can be entered either

automatically or after dedicated host command.

134812

Objective short data sheet

Rev. 1.2 — 4 September 2007

© NXP B.V. 2007. All rights reserved.

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