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STM32F405 数据表(PDF) 137 Page - STMicroelectronics |
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STM32F405 数据表(HTML) 137 Page - STMicroelectronics |
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137 / 204 page  DS8626 Rev 9 137/203 STM32F405xx, STM32F407xx 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) 1. VREF+ and VREF– inputs are both available on UFBGA176. VREF+ is also available on LQFP100, LQFP144, and LQFP176. When VREF+ and VREF– are not available, they are internally connected to VDDA and VSSA. STM32F 1 μF // 10 nF 1 μF // 10 nF VREF+ (1) VDDA VSSA/VREF- (1) ai17535b |
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