so i found this on wiki after searching a bit

On February 26, 2013, Freescale Semiconductor announced the creation of the world's physically smallest ARM-powered chip. The Kinetis KL02 measures 1.9 by 2 millimeters and is a full microcontroller unit (MCU), meaning the chip sports a processor, RAM, ROM, clock and I/O control unit. The chip competes with the Atmel M0+ offerings, which are the low-power leaders in the industry.[22] One application that Freescale says the chips could be used for is swallowable computers. Freescale already works with a variety of health and wellness customers. Both the Fitbit and OmniPod insulin pump use Freescale chips. The new chip was on display at 'Embedded World' in Nuernberg, Germany, from February 26–28, 2013.[23]

The article that op posted is about the 03 version.... that fucker must be small.