Friends who have worked with microcontroller products know that the STM32 chip has multiple VDD and VSS pins, as shown in the figure below: So why are there so many pins? Wouldn’t it be better to have fewer? Fewer pins make PCB routing easier. Actually, there are reasons for the chip being designed this way. … Read more
In the power-off module, it may be required for the register to latch the data before shutdown or to restore the latched data after the power is turned on, which requires a special unit called the Retention Register. The retention register has two sets of registers: the Main Register and the shadow register, where the … Read more
Half Dimension – w Mu Xiaojiu w Low Power Design Techniques – Multi VDD Dynamic power consumption is proportional to the square of the voltage; therefore, reducing the supply voltage is very effective in lowering dynamic power consumption. The principle of multi-supply voltage is shown in the figure below. For certain modules in the design, … Read more
In microcontroller chips, multiple groups of VDD designs are often seen. This design is intended to ensure power stability while reducing signal noise. This article will explore why multiple VDD groups are needed on microcontroller chips from the perspectives of internal circuit structure, power consumption, EMI/EMC, and how to design the VDD power system. 1. … Read more