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STM32L021D4 bảng dữ liệu(PDF) 40 Page - STMicroelectronics

tên linh kiện STM32L021D4
Giải thích chi tiết về linh kiện  Access line ultra-low-power 32-bit MCU Arm®-based Cortex®-M0, 16KB Flash, 2KB SRAM, 512B EEPROM, ADC, AES
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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STM32L021D4 bảng dữ liệu(HTML) 40 Page - STMicroelectronics

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Pin descriptions
STM32L021x4
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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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