3.7.5.15 Extra Load on Rail
Suppose the primary issue caused by the residual voltage is an above-threshold voltage
compromising the power-on reset or an incorrect device configuration strapped. In that case, a
solution might be adding an extra load to the affected rail. Turning this load on only during the
power-up sequence is advisable for reducing the extra power consumption. Before implementing
this approach, make sure the extra load is not overloading the output driver or the ESD protection
diode. Often this method is used in conjunction with other methods described before as an
additional fallback solution. For example, the driver should drive output signals low to prevent
backfeeding. If the driver fails to set the output signals correctly, the extra load can make sure that
the peripheral's power-on reset is still triggering.
Figure 56: Additional load on peripheral rail
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