SPRUIZ1B July 2023 – August 2024 TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DH-Q1 , TMS320F28P659DK-Q1 , TMS320F28P659SH-Q1
During the fabrication and test process, Texas Instruments calibrates the gain, offset, and linearity of the ADCs and the offset of the buffered DACs. These trim settings are stored in TI reserved OTP memory, and can be loaded using C-callable functions.
Until the appropriate factory trim is loaded, the ADC and other analog modules are not specified to operate within the data sheet specifications. Similarly, if trim values other than the factory settings are placed into the trim registers, the ADC (and other modules) is not specified to operate within the data sheet specifications.
The boot ROM calls the calibration functions, so trim values are initially populated without user intervention. However, if the trims are cleared due to a module reset or modified for some other reason, then the user must call the calibration functions (defined in the C2000Ware header files).