SLVUCU5 December 2025 UCD91160 , UCD91320
| ACK: | Acknowledge – Indicates that the PMBus has received the message correctly. |
| ADC: | Analog-to-digital converter – Converts analog voltages to digital counts that can be used for monitoring or control. |
| DAC: | Digital-to-analog converter |
| DFlash: | Data Flash memory – Nonvolatile memory used for storing PMBus settings. The values in DFlash are automatically copied to RAM during wake up. |
| FPWM: | Fast pulse width modulation pin. These pins are capable of a higher frequency than the other PWM pins. |
| GPI: | General-purpose input |
| GPIO: | General-purpose input/output |
| GPO: | General-purpose output |
| NACK: | Non-acknowledge – An error has occurred in the PMBus message transfer. |
| PFlash: | Program Flash memory – Nonvolatile memory used for the UCD91xxx main firmware. |
| PMBus: | Power Management Bus – An open-standard protocol that defines a means of communicating with power conversion devices using an I2C physical interface. |
| PWM: | Pulse width modulation or pulse width modulator |
| RAM: | Random access memory – Volatile memory used to hold PMBus settings and internal variables. PMBus settings are lost after a reset unless they are stored to Data Flash. |
| ROM: | Read-only memory – Nonvolatile memory used for the UCD91xxx boot algorithms and some common data tables. |