JAJSIU8B June 2015 – April 2020 ADS131E08S
The ADS131E08S has a total of four general-purpose digital I/O (GPIO) pins available. Configure the digital I/O pins as either inputs or outputs through the GPIOC bits. The GPIOD bits in the GPIO register indicate the level of the pins. The GPIO logic high voltage level is set by the voltage level of DVDD. When reading the GPIOD bits, the data returned are the logic level of the pins, whether they are programmed as inputs or outputs. When the GPIO pin is configured as an input, a write to the corresponding GPIOD bit has no effect. When configured as an output, a write to the GPIOD bit sets the output level.
If configured as inputs, the GPIO pins must be driven to a defined state. The GPIO pins are set as inputs after power-up or after a reset. Figure 31 shows the GPIO pin structure. Connect unused GPIO pins directly to DGND through 10-kΩ resistors.