Why PCAL6524 is a Widely Capable IO Expander

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

Tyler Townsend 9/12/25 Tyler Townsend 9/12/25

What Does the “R” Mean in TCAL6416R?

What does TCAL6416R mean? What is the difference between TCAL6416 and TCAL6416R? Why does a sticky reset matter?

Tyler Townsend 9/12/25 Tyler Townsend 9/12/25

This is a generic coding example of setting up an Arduino to write and read I2C

Tyler Townsend 9/12/25 Tyler Townsend 9/12/25

Tyler Townsend 9/12/25 Tyler Townsend 9/12/25

I2C controlled switches are used in various applications for same I2C address conflicts, separating bus capacitance, and data flow control.