SLVUCU5 December 2025 UCD91160 , UCD91320
UCD91xxx has GPIO pins that can function as either inputs or outputs. Each GPIO has configurable output mode options, including open-drain or push-pull outputs that can be actively driven to 3.3 V or ground. Refer to the device-specific pinout for a list of possible uses for the GPIO pins and the maximum number of each type for each use.
GPIO pins can act as dependencies in sequencing and alarm processing. They can also be used for system-level functions such as external interrupts, power-goods, resets, or for the cascading of multiple devices. GPIOs can be sequenced up or down by configuring a rail without a MONx pin but with a GPIO set as an enable.
GPIOs can be configured to support different functionality using PMBus. The list of supported functionalities is as follows:
Command-Controlled General-Purpose Outputs (GPOs)
Logic-Controlled General-Purpose Outputs (LGPOs)
General-Purpose Inputs (GPIs)
Power-Supply Rail Enables (ENx)
Cascading Multiple Devices
Margining Outputs (MARx)