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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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STM32L021D4 Datenblatt(PDF) 40 Page - STMicroelectronics |
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STM32L021D4 Datenblatt(HTML) 40 Page - STMicroelectronics |
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40 / 114 page  Pin descriptions STM32L021x4 40/114 DocID027982 Rev 5 ---- 32 - VSS S (4) -- ---- 1 1 VDD S - (5) -- 1. VSS pins are connected to the exposed pad (see Figure 34: UFQFPN32 - 32-pin, 5x5 mm, 0.5 mm pitch ultra thin fine pitch quad flat package outline). 2. Device reset input/internal reset output (active low). 3. Analog power supply. 4. On TSSOP14 package, VDDA is internally connected to VDD. 5. Digital and analog ground. 6. Digital power supply. 7. PA14 pin on TSSOP14 package acts as an output pin when the embedded bootloader is active (SPI1_MISO). On empty devices (devices from factory), the bootloader is active due to the empty check mechanism (refer to RM0377 reference manual). PA14 pin also acts as SWCLK. When programming devices in TSSOP14 for the first time, it is necessary to use the "connect under reset" method and the SWD interface to disable the bootloader by driving this PA14/SWCLK pin. Table 12. Pin definitions (continued) Pin number Pin name (function after reset) Notes Pin functions Alternate functions Additional functions |
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