topic LPCDIRQ in Other NXP Products

LPCDIRQ

shaco — Sun, 21 Apr 2024 08:20:17 GMT

Hello,

We are currently working on a basic project involving the CLRC663 (CLEV6630B v 2.0 26/22 SN: 5578). I'm facing an issue with activating LPCDIRQ. Below is my current setup and activation process:

def Init(self

self.write_reg(0x2E, 0x08)

self.write_reg(0x00, 0x00)

self.write_reg(0x02, 0xB0)

self.write_reg(0x05, 0x0A)

self.write_reg(0x00, 0x0D)

self.write_reg(0x02, 0xB0)

self.write_reg(0x28, 0x86)

time.sleep(0.001)

self.write_reg(0x28, 0x8E)

time.sleep(0.001)

self.write_reg(0x05, 0x01)

self.write_reg(0x05, 0x94)

self.write_reg(0x05, 0x28)

self.write_reg(0x05, 0x12)

self.write_reg(0x00, 0x0C)

self.write_reg(0x00, 0x00)

self.write_reg(0x02, 0xB0)

self.write_reg(0x06, 0x7F)

self.write_reg(0x07, 0x60)

self.write_reg(0x08, 0x84)

self.write_reg(0x09, 0x60)

self.write_reg(0x23, 0xDC)

self.write_reg(0x24, 0xFF)

self.write_reg(0x3A, 0x08)

self.write_reg(0x00, 0x01)

Presently, when attempting to receive interrupts upon a tag entering the designated zone, I'm not receiving any signals.

many thanks!

Re: LPCDIRQ

EduardoZamora — Mon, 22 Apr 2024 18:53:14 GMT

Hello @shaco,

Hope you are doing well.

My apologies, our support scope is limited to the usage of our Development Kits and the recommended NFC Reader Library. Please consider using the NFC Reader Library, which is a complete software support library for NFC Frontend ICs designed to provide a faster and simpler way to develop your project. This library also provides an API that facilitates the most common operations required in NFC applications and includes an example project that demonstrates LPCD operation.

Additionally, I will recommend you checking the AN11783 CLRC663 plus Low Power Card Detection for more information on the principle of the low power card detection (LPCD) offered by the CLRC663 plus. It describes how to use the LPCD and how to optimize the related settings.

Regards,
Eduardo.

Re: LPCDIRQ

shaco — Wed, 24 Apr 2024 13:11:53 GMT

Hi,

I'm currently attempting to activate the LPCD via the cockpit, but unfortunately, I haven't had any success. It seems that the tags aren't triggering the reader at any point. Any insights or assistance would be greatly appreciated!

Thank you!

Re: LPCDIRQ

EduardoZamora — Wed, 24 Apr 2024 19:07:07 GMT

Hi,

Please, take a look at Using the RC663 without library for more information on how to communicate with the RC663 without the recommended NFC Reader Library. Also, there you will find a code snippet used to initialize the RC663 to the ISO14443 protocol, send a REQA command and listen to the response of a tag.

Additionally, the CLRC66303 should offer a flexible configuration for Low-Power Card detection with the register LPCD_OPTIONS. You can find a brief description of LPCD in CLRC663 and CLRC663 plus Data Sheet, Section 8.9.3; and the available LPCD configuration registers in Section 9.14.

Regards,
Eduardo.