SPRAD67B December 2022 – September 2024 AM2431 , AM2432 , AM2434 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442
One of the two pins assigned to the MMC0 PHY IO supply (VDDS_MMC0) in the SR1.0 processor is assigned as the ADC0_REFP pin in SR2.0. No compatibility issue is observed when installing a SR2.0 processor on a PCB that was designed for the SR1.0 pin assignment since the ADC0_REFP operates at the same voltage as VDDS_MMC0. However, the ADC can have performance issues if trying to use the device when a SR2.0 processor is installed on a PCB designed for SR1.0 processors since noise from the MMC0 PHY IO supply can couple directly into the ADC0_REFP pin.
SR1.0 processor cannot be installed on a PCB designed for SR2.0 processors since this PCB has a dedicated ADC0_REFP source which gets shorted to VDDS_MMC0 when a SR1.0 processor is installed.
One of the VSS pin is re-assigned to be ADC0_REFN. Currently ADC0_REFN is connected to VSS in the package. This change eliminates any direct coupling of package ground bounce into the ADC reference. This pin change does not have any impact on the PCB design since the SR1.0 VSS pin is already connected to the PCB VSS plane and the new SR2.0 ADC0_REFN pin is expected to also be connected to the PCB VSS power plane.