SPRUIN7C March 2020 – March 2024 TMS320F280021 , TMS320F280021-Q1 , TMS320F280023 , TMS320F280023-Q1 , TMS320F280023C , TMS320F280025 , TMS320F280025-Q1 , TMS320F280025C , TMS320F280025C-Q1
The following analog subsystem block diagrams show the connections between the different integrated analog modules to the device pins. These pins fall into two categories: analog module inputs/outputs and reference pins.
The analog pins are organized into analog groups around the CMPSS module. The pins which connect to CMPSS inputs can be used for the CMPSS without further action and without preventing use as an ADC input simultaneously.
The VDAC reference pin can be used to set an alternate range for the CMPSS modules (the CMPSS DACs are referenced to VDDA and VSSA by default). Using this pin as a reference prevents the channel from being used as an ADC input (but the ADC can be used to sample the VDAC voltage, if desired). The choice of reference is configurable per-module for each CMPSS, and the selection is made using the module’s configuration registers.
The following notes apply to all packages:
Figure 14-1 shows how each analog group is structured. Section 14.5 lists the analog pins and internal connections.