SPRZ452I july 2018 – may 2023 AM6526 , AM6528 , AM6546 , AM6548
AM65x silicon revision 1.0, 2.0, and 2.1 incorporate fail-safe I/O’s on several pins (I2C0_SCL, I2C0_SDA, I2C1_SCL, I2C1_SDA, and NMIn). The fail safe I/O’s tolerate voltage applied on the pins before their respective I/O supply voltage is ramped up. There is a potential latch up risk based on design reviews of the fail-safe I/O pins when driven high during functional mode. This latch-up risk is not yet confirmed through silicon characterization. To avoid the risk of a latch-up condition, the following steps should be implemented, depending on the mux mode used on the fail safe I/O. If the fail safe I/O is used in an I2C mux mode, then an external pull-up resistor (> 1 kOhm) is required on the signal. If the fail safe I/O is used in any other mux mode, then an external series resistor (> 1 kOhm) should be placed on this signal (close to the SoC).