SBAS740B October 2015 – May 2020 ADS1118-Q1
PRODUCTION DATA.
Most microcontrollers have programmable input/output (I/O) pins that can be set in software to act as inputs or outputs. If an SPI controller is not available, the ADS1118-Q1 can be connected to GPIO pins and the SPI bus protocol can be simulated. Using GPIO pins to generate the SPI interface requires only that the pins be configured as push or pull inputs or outputs. Furthermore, if the SCLK line is held low for more than 30.8 ms, communication times out. This condition means that the GPIO ports must be capable of providing SCLK pulses with no more than 30.8 ms between pulses.