From Microchip web site
The ATtiny3217 family of microcontrollers incorporates several innovative features including high-accuracy analog, the Peripheral Touch Controller (PTC), the Event System and Core Independent Peripherals (CIPs) to allow you to create highly-responsive sensor nodes. This family offers up to 32 KB Flash memory in 8- to 24-pin packages to support a wide range of applications including industrial, consumer, appliances, automotive and Internet of Things (IoT) sensor nodes.
Jim