We are affraid when one device has CS signal down, other devices will be set to I2C there can be conflict on the SPI BUS. Is it possible connect more devices as eclosed schematic?
Regarding of PCB design it was very complicated to find solution. Now, after replacing of one bad device on the bus everything works well as should and level on SCK is 1,8V. Thank you for your support.
Please forget to level shifter - it was only example for LSM9DS1 - I could verify properly working communication of 3-wire SPI. It is on second PCI. Now I am working ( MCU and LSM303AH ) on 1,8V of course. I tried to play with settings of output pin ...
My testing board with 3-wire SPI devices is ready. There are more magnetometers on my board. More complicated connection of LSM9DS1 on 3.3V connected with ATXMEGA on 1.8V via level shifter works properly. But clock to LSM303AH are pulled down to leve...
