SPRACU5C June 2021 – September 2023 AM2431 , AM2432 , AM2434 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442
The MMC1 IO interface (CMD, CLK and Data) of the processor is powered by VDDSHV5 (Dual-voltage IO) supply rail (IO supply for IO group 5).
VDDSHV5 supports power-up, power-down, or dynamic supply voltage change without any dependency on other supplies.
The processor includes an integrated SDIO_LDO to power VDDSHV5 supply when configured for SD Card interface. The output of the power switch described in the reset section below is connects as input to the SDIO_LDO (VDDA_3P3_SDIO). The output of SDIO_LDO is 3.3 V during power-up and allows changing to 1.8 V when software is ready to change the supply voltage. The output of the SDIO_LDO is controlled by the V1P8_SIGNAL_ENA bit and defaults to 3.3 V output.
Ensure the recommended capacitor is provided at the output of SDIO_LDO pin (CAP_VDDSHV_MMC1).
The SD Card Detect (CD) and Write Protect (WP) pins are connected to the VDDSHV0 (Dual-voltage IO) supply rail (IO supply for IO group 0).
It is recommended to connect the same supply rail to VDDSHV0 and inputs MMC1_SDCD, MMC1_SDWP from SD Card.