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AN2752 Rev 6 9/40

AN2752 Power supply

Recommendations

All pins need to be properly connected to the power supplies. It is important to have the

lowest possible impedance for these connections, including pads, tracks and vias. This is

typically achieved with thick track widths and dedicated power supply planes in multi-layer

printed circuit boards (PCBs).

In addition, each power supply pair has to be decoupled with 100 nF filtering ceramic

capacitors (C) with one chemical capacitor (1 to 2 µF) in parallel on the STM8S or STM8AF

device. The ceramic capacitors (including C

EXT

capacitor between VCAP and VSS pins)

need to be placed as close as possible or below the appropriate pins, on the opposite side

of the PCB. Typical values are 10 nF to 100 nF, but exact values depend on the application

needs.

Figure 3 shows the typical layout of the V

and V

CAP

pairs.

Figure 3. Typical layout of V

and V

CAP

pairs

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ST STM8S Getting Started

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