topic Re: CLRC663 and I2C in NFC

CLRC663 and I2C

fomin-ruslan32 — Mon, 26 Oct 2020 14:58:30 GMT

Hi, everyone!

I am developing Nfc reader for home access systems.

I've the STM32F207 and CLRC663. They communicate via I2C interface.

Bus frequency is 400 kHz. In the system has another I2C device on same bus.

Сan there be problems in the operation of the CLRC663 if there is another parallel operating device?

Or is it better to leave only CLRC663 on the bus?

Re: CLRC663 and I2C

nxf58474 — Tue, 27 Oct 2020 18:12:19 GMT

Hi,

Hope you are doing well. There should be no problem having two devices on an I2C bus, but it would be better to have just one I2C bus for the CLRC663.

Best Regards,

Ricardo

Re: CLRC663 and I2C

Gaolaowai — Wed, 11 Nov 2020 02:52:19 GMT

Are there any examples or existing code that shows a working state using i2c? All the existing examples seem to be biased toward SPI.

Re: CLRC663 and I2C

fomin-ruslan32 — Wed, 25 Nov 2020 08:17:54 GMT

If you can read and write clrc663 registers through i2c then the i2c interface is working. But there is a nuance, if the bus frequency is higher than 100 kHz, you must wait a while until the command is processed.

Re: CLRC663 and I2C

fomin-ruslan32 — Wed, 25 Nov 2020 08:20:16 GMT

hi, Ricardo!

Thanks a lot of answer.