SPRACP6 December 2019 TMS320F2800132 , TMS320F2800133 , TMS320F2800135 , TMS320F2800137 , TMS320F2800152-Q1 , TMS320F2800153-Q1 , TMS320F2800154-Q1 , TMS320F2800155 , TMS320F2800155-Q1 , TMS320F2800156-Q1 , TMS320F2800157 , TMS320F2800157-Q1 , TMS320F280021 , TMS320F280021-Q1 , TMS320F280023 , TMS320F280023-Q1 , TMS320F280023C , TMS320F280025 , TMS320F280025-Q1 , TMS320F280025C , TMS320F280025C-Q1 , TMS320F280040-Q1 , TMS320F280040C-Q1 , TMS320F280041 , TMS320F280041-Q1 , TMS320F280041C , TMS320F280041C-Q1 , TMS320F280045 , TMS320F280048-Q1 , TMS320F280048C-Q1 , TMS320F280049 , TMS320F280049-Q1 , TMS320F280049C , TMS320F280049C-Q1
This application report provides several suggestions on maximizing the GPIO resources on the device to limit the need for IO expanders. Most of the content in this report is catered towards the TMS320F28004x series but can be adapted for other C2000 real-time controllers.
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With the integration trend of microcontrollers, new C2000 devices now provide more analog peripherals, which reduce the system level cost and design effort. The F28004x device incorporates on-chip analog-to-digital converters (ADCs), buffered digital-to-analog converters (DACs), programmable gain amplifiers (PGAs), and comparator subsystems (CMPSS). However, the addition of all this extra analog along with their required pins has led to the reduction in the number of GPIOs. This document explores several options on how to maximize usage of GPIOs.