Rise-time accelerators are FET based architectures used to speed up a rising or falling edge transition particularly on a data or clocking signal. Parasitic capacitive loading increase the RC time constant, and slows down edge transitions. Rise-time accelerators or fall-time accelerators (one-shots) solve this issue.

I2C GPIO Expanders are common devices used in several applications ranging from industrial, personal electronics, enterprise systems, and much more.

An buffered low output is used in bi-directional buffers like I2C. This helps the buffer re-drive with locking up by re-driving its own input.

I2C Controllers and I2C targets are the most basic building blocks of an I2C system. These are generalized terms in the standard that replace “master” and “slave” terminology. Controllers and targets have specific functions some of which are highlighted here.

PCAL6524 from NXP is a low voltage translating 24-bit FM+ I2Cbus/SMBus IO expander with Agile IO features, external interrupt and reset

TCAL6416 I2C IO Expander from Texas Instruments. This post uncovers the nuances of writing and reading I2C to a target such as this IO expander.

What is the purpose of open-drain interrupts? Open-drain interrupts are used to communicate some type of indicator or flag back to the MCU. It signals the brains of system that something has happened to one or more peripheral devices in a design.

Input high voltage, input low voltage, output high voltage, output low voltage. Why do these terms matter, and how to design electrical systems with this electrical characteristics in mind.

This post contains links to various topics for I2C and is updated when new and valuable I2C resources are posted to the internet.

What is I2C buffering? How is the TCA9517A used?