Waiting, Stopping, or Clock Circuit Analysis in Low-Power Mode


The μC supply voltage must remain within the recommended regulation voltage range. However, depending on the situation in the diagram, due to the presence of clamping diodes on the input and output networks, it may cause current to be injected in the μC power supply circuit.

Input and output injection current path examples

According to specifications need to monitor the parameters

-   Input / output peak current and average current

- The sum of the peak current and average current of all input / output pins.

If the injected current is higher than μC , the external regulator cannot fully guarantee its function and the supply voltage may exceed the recommended range. Especially in low power modes such as waiting, stopping or stopping the clock circuit

Design parameters to check

The supply voltage is the worst case injection current at the input.

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