I need to connect four LSM9DS1 on a common SPI bus. (I2C won't work here---resources are not available on the host microcontroller.)
I'm having a hard time getting the following from the datasheets, and hoping maybe someone with experience with these chips can give me some pointers:
- In 4 wire SPI mode, do SDO_M and SDO_A/G assume a tristate/high-impedance state when their respective chip selects are not asserted?
- In 3 wire SPI mode, does SDA/SDI/SDO become tri-state/high-impedance when a chip select is not asserted?
- Is there any way to avoid needing both chip selects, and somehow tie these together for each chip, selecting whether you are talking to the A/G or Magnetometer via a register setting?
Thanks!
Tyler
