SPI requires a minimum of 3 channels: SCLK
(SPI Clock), SDO (Serial Data Out) and SDI (Serial Data In). When used in bus format or with
specific peripheral devices a chip select (nCS or CS) is required. Four or six channel
digital isolator devices support SPI applications depending on the number of chip select
signals needed. Six channel digital isolators or multiple digital isolators support SPI
peripherals with additional IO lines needed for status or control in parallel to the SPI
signals.
Isolation prevents DC and unwanted AC currents between controller devices and peripheral
ICs.
Isolation protects low voltage parts in a
system from high voltage circuits.
Isolation diminishes the effect of ground
potential difference and eliminates ground loops.
Isolation devices with integrated isolated power provide signal and power transfer between
controller devices and peripheral ICs.