29.6 Functional Description

The PTC analog front end (AFE) and the digital controller are not managed directly by the Cortex-A5 processor. An intermediate processor (pPP) is introduced to manage all functionalities of the PTC. A pPP program, a “firmware”, is needed. This program is loaded by the Arm (host) in a shared SRAM area. The firmware embeds many software functionalities and algorithms to ensure an efficient touch detection.