STM32L021D4 datasheet(37/114 Pages) STMICROELECTRONICS

Part #	STM32L021D4

Description	Access line ultra-low-power 32-bit MCU Arm®-based Cortex®-M0, 16KB Flash, 2KB SRAM, 512B EEPROM, ADC, AES

PDF	114 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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37 / 114 page

DocID027982 Rev 5

37/114

STM32L021x4

Pin descriptions

PA3

I/O

TIM21_CH2,

TIM2_CH4,

USART2_RX,

LPUART1_RX

COMP2_INP,

ADC_IN3

PA4

I/O

TTa

SPI1_NSS,

LPTIM1_IN1,

LPTIM1_ETR,

I2C1_SCL,

USART2_CK,

TIM2_ETR,

LPUART1_TX,

COMP2_OUT

COMP1_INM,

COMP2_INM,

ADC_IN4

PA5

I/O

TTa

SPI1_SCK,

LPTIM1_IN2,

TIM2_ETR,

TIM2_CH1

COMP1_INM,

COMP2_INM,

ADC_IN5

PA6

I/O

SPI1_MISO,

LPTIM1_ETR,

LPUART1_CTS,

EVENTOUT,

COMP1_OUT

ADC_IN6

131313

PA7

I/O

SPI1_MOSI,

LPTIM1_OUT,

USART2_CTS,

TIM21_ETR,

EVENTOUT,

COMP2_OUT

COMP2_INP,

ADC_IN7

PB0

I/O

EVENTOUT,

SPI1_MISO,

TIM2_CH2,

USART2_RTS_DE,

TIM2_CH3

ADC_IN8,

VREF_OUT

141515

PB1

I/O

USART2_CK,

SPI1_MOSI,

LPTIM1_IN1,

LPUART1_RTS_DE,

TIM2_CH4

ADC_IN9,

VREF_OUT

-----

PB2

I/O

LPTIM1_OUT

Table 12. Pin definitions (continued)

Pin number

Pin name

(function

after reset)

Notes

Pin functions

Alternate functions Additional functions

STM32L021D4 Datasheet(PDF) 37 Page - STMicroelectronics

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