topic SC18IS602's chip select polarity in Other NXP Products

SC18IS602's chip select polarity

mertmertce — Tue, 23 Jan 2018 16:16:06 GMT

Hi all,

I have been working with SC18IS602--- I2C to SPI converter. I have got a problem with the chip. My device get SPI data when Chip select pin is high but the SC18IS602 generating active low chip select signal. Is there any way of configure the SS pins polarity?

I have read the datasheet and could not fount any related thing. Any other suggestion would be appreciated.

Thanks,

Mert

Re: SC18IS602's chip select polarity

TomasVaverka — Wed, 24 Jan 2018 09:20:40 GMT

Hi Mert,

You can configure the SS pins as GPIOs and then use the GPIO Write command to change the state of selected GPIOs/SSs.

Best regards,

Tomas

Re: SC18IS602's chip select polarity

mertmertce — Wed, 24 Jan 2018 12:49:18 GMT

Hi Tomas,

Thanks for your quick response. I have done it so but it didnt work. To write sth from i2c to SPI, the write protocol asks for chip select pin (as stated in datasheet). If I send the chip select pin which I configured as GPIO it is not generating any output. However if I send some other Chip select pin that are not configured as GPIOs it is generating something on MOSI and SCK.

Why it is behaving so? Do I need to change write protocol as well when I configure the chip select pins as GPIO?

Thanks

Mert