This MPLAB X bare metal example in Using the Internal OPAMP as Regulated Power Supply for MVIO (AN3636) shows how to use the OPAMP as a regulated power supply for a second voltage domain. This removes the need for a second external power supply. The regulated power supply features is showcased by acting as the second power supply for the Multi-V…

These MPLAB X bare metal examples in Getting Started with Multi Voltage I/O (MVIO) (TB3287) show how the MVIO is used on the AVR® DB family of microcontrollers. The MVIO peripheral allows a subset of the I/O pins to be powered by a different I/O voltage domain VDDIO2, eliminating the need for external level shifters

These MPLAB X bare metal examples in Getting Started with High Frequency Crystal Oscillator (XOSCHF) in AVR® DB (TB3272), show how the XOSCHF and Clock Failure Detection (CFD) is used on the AVR DB family of microcontrollers.

This MPLAB X bare metal example in Constant-Current Driver Using the Analog Signal Conditioning (OPAMP) Peripheral (AN3632), shows how to use the OPAMP to implement a constant-current driver using just one external resistor. The OPAMP peripheral also provides the ability to adjust the current setting under firmware control.

This MPLAB X bare metal example in Low-BOM Microphone Interface Using the Analog Signal Conditioning (OPAMP) (AN3631) shows how to interface an electret microphone with a microcontroller (MCU) using the OPAMP. In addition to the microphone, only one resistor and one capacitor are required. The OPAMP also provides the ability to adjust the gain u…