AOV Q&A

Q1: Abnormal Hang in STR

Check whether the system abnormality is caused by a power-on event triggered before the SOC has been completely powered off. If so, please check the following points:

1.Check whether the circuit has added an NMOS with reference to the External MCU and SOC Power-On/Off Scheme.

If the NMOS circuit is added but the system still has an abnormality caused by a power-on event triggered before the SOC is completely powered off, it is necessary to confirm whether the "time from NMOS conduction to the actual triggering of IO1" is longer than the "time from NMOS conduction to the core voltage dropping to 0". If not, adjust the C535 capacitor to meet the above condition.

2.Check whether there is leakage from peripheral devices (such as USB, UART) to the SOC, which causes the SOC power supply to not be completely cut off and leads to abnormal power-on timing.

3.Check whether the GPIO used for communication between the external MCU and the SOC remains at a high level during the SOC power-down process. Additionally, verify if the SOC's GPIO is not set to a high-impedance state, which could cause electrical leakage into the SOC. This leakage might prevent the SOC's power supply from fully discharging, leading to abnormal power-on sequencing.

Q2: HW Rst Occurs in STR

1.Check if there is a situation where RTC_IO1 is pulled high for 8 seconds. If RTC_IO1 is pulled high for 8 seconds, the SOC will be forced to shut down.

In scenarios with one frame per second where IO1 is used as the GPIO for the external MCU to wake up the SOC, if the RTC CLK is 1Hz (coinciding with the one-frame-per-second cycle), there is a risk of misjudging that RTC_IO1 has been pulled high for 8 seconds, which may cause abnormal wake-up failure of the SOC. Please use RTC_IO0 as the GPIO for the external MCU to wake up the SOC.

2.Confirm whether the DDR power supply and RTC power supply are stable.

Q3: Randomly Stuck in a Certain Startup Process During Boot

1.Confirm that all voltage channels are normal.

2.If the voltage is abnormal and the IDAC function is enabled, check whether the software misuses the GPIOs of IDAC.