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CD00237391 Datasheet, PDF (119/177 Pages) STMicroelectronics – ARM-based 32-bit MCU, 150DMIPs, up to 1 MB Flash/128+4KB RAM
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STM32F20xxx
Electrical characteristics
General PCB design guidelines
Power supply decoupling should be performed as shown in Figure 51 or Figure 52,
depending on whether VREF+ is connected to VDDA or not. The 10 nF capacitors should be
ceramic (good quality). They should be placed them as close as possible to the chip.
Figure 51. Power supply and reference decoupling (VREF+ not connected to VDDA)
STM32F
V REF+
(See note 1)
1 µF // 10 nF
1 µF // 10 nF
V DDA
V SSA/V REF-
(See note 1)
ai17535
1. VREF+ and VREF– inputs are both available on UFBGA176 package. VREF+ is also available on all packages
except for LQFP64. When VREF+ and VREF– are not available, they are internally connected to VDDA and
VSSA.
Figure 52. Power supply and reference decoupling (VREF+ connected to VDDA)
STM32F
VREF+/VDDA
(See note 1)
1 µF // 10 nF
VREF–/VSSA
(See note 1)
ai17536
1. VREF+ and VREF– inputs are both available on UFBGA176 package. VREF+ is also available on all packages
except for LQFP64. When VREF+ and VREF– are not available, they are internally connected to VDDA and
VSSA.
Doc ID 15818 Rev 9
119/177
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