SC18IS602B IC is not driving any of the SPI signals

[rasif22]

Hi,

I am using SC18IS602B as I2C to SPI bridge. I am using SS0 as the chip select. And the value for configuration register is written as 00 in the specified command format. But none of the SPI signals are getting driven on trying to access the device.

Does the MOSI,MISO,CLK and CS need a pull up resistor or so? Please reply asap, as the card bring up is held up because of this issue. We are able to read the buffer with the values we are writing by reading it using the specified format. And the values are correct.

Regards,

Rasif

[AldoG]

Hello, Rasif

The need for pull-up resistors in MISO, MOSI and SCLK depends of your application

e.g. for communication with an SD card, 

As for CS is a good idea to place a pull-up resistor since is active low for almost all devices.

Best regards,

Aldo