Low power card detection with MFRC522

[zzzzzhou]

Hi,

I'm using MFRC52202HN1. To detect whether a card is present, I need to periodically send a PICC_REQALL command and check the RxIRq bit in the ComIrqReg register. In this way, the current consumption is too high in a battery-powered system.

Is there anyway to implement a low power card detection with MFRC522?

Thank you in advance for any suggestion!

zhou

[Jorge_Gonzalez]

Hello Zhou Zheheng:

Unfortunately the MFRC522 does not implement a Low Power Card Detection feature. To reduce power consumption you need to implement software tricks like periodic delays between card scans.

I would recommend you to give a check to some of NXP later products which implement LPCD mode to save power (Low Power Card Detection), like the PN5180, PN7462 and PN7120/PN7150:

PN5180: High-performance multi-protocol full NFC Forum-comp|NXP

PN7462: PN7462 | All-in-one NFC Cortex-M0 MCU 160kB Flash|NXP

PN7120: PN7120 | Plug'n Play NFC Controller for OS Systems|NXP

PN7150: High performance full NFC Forum-compliant controlle|NXP

Best Regards!,
Jorge Gonzalez

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