* Question
| What is the working procedure for the master device to manage all the power supplies on the PCB? |
* Answer
| 1 Class 1: The master waits for the intermediate bus voltage (12v) to stabilize and then transitions to Phase 2.Phase 2: Turn on the lowest centralized power supply (1.8v) and set PWR0 and PWRl to “01”.The slave device turns on the lowest POL power supply (1.3V, 1.2V). 3.Phase 3: The Power Good signal is active and the reset pulse lasts for 100 ms.After the CPU reset signal is deactivated (end of the pulse extension period), normal PCB operation starts in phase 4.Phase 4: The master monitors the power supply through the analog input and the Response signal from the slave.If the intermediate bus voltage drops below the rated voltage, the master generates a CPU reset signal and jumps to phase 5.5 Phase 5: At this stage, the power supplies are powered down in the reverse order of Phase 2.First, when PWl and PWR1 are “01”, the centralized 3.3V power supply and the 3.3V POL power supply are disconnected. |
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