Datasheet

Pin descriptions STM32L011x3/4
40/119 DocID027973 Rev 5
- - - 26 28 28 - PB5 I/O FT -
SPI1_MOSI,
LPTIM1_IN1,
I2C1_SMBA,
TIM21_CH1
COMP2_INP
- 18 - 27 29 29 A3 PB6 I/O FTf -
USART2_TX,
I2C1_SCL,
LPTIM1_ETR,
TIM2_CH3,
LPUART1_TX
COMP2_INP
- 19 - 28 30 30 A4 PB7 I/O FTf -
USART2_RX,
I2C1_SDA,
LPTIM1_IN2,
TIM2_CH4,
LPUART1_RX
COMP2_INP,
VREF_PVD_IN
1201 13131A5PB9-BOOT0 I B - -
BOOT0 (Boot
memory selection)
-----32- PB8 I/OFTf -
USART2_TX,
EVENTOUT,
I2C1_SCL,
SPI1_NSS
-
----32-- VSS S -
(5)
--
----11- VDD S -
(6)
--
1. V
SS
pins are connected to the exposed pad (see Figure 35: 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, V
DDA
is internally connected to V
DD
.
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 13. Pin definitions (continued)
Pin number
Pin name
(function
after reset)
Pin type
I/O structure
Notes
Pin functions
TSSOP14
UFQFPN20
TSSOP20
UFQFPN28
LQFP32
UFQFPN32
(1)
WLCSP25
Alternate functions
Additional
functions
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