STM32L021D4 datasheet(36/114 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

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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36 / 114 page

Pin descriptions

STM32L021x4

36/114

DocID027982 Rev 5

Notes

Unless otherwise specified by a note, all I/Os are set as floating inputs during and

after reset.

Pin functions

Alternate

functions

Functions selected through GPIOx_AFR registers

Additional

functions

Functions directly selected/enabled through peripheral registers

Table 11. Legend/abbreviations used in the pinout table (continued)

Name

Abbreviation

Definition

Table 12. Pin definitions

Pin number

Pin name

(function

after reset)

Notes

Pin functions

Alternate functions Additional functions

2122

PC14-

OSC32_IN

I/O

OSC32_IN

3233

PC15-

OSC32_OUT

I/O

OSC32_OUT

4344

NRST

I/O RST

(2)

455

VDDA

(3)(4)

5566

PA0-CK_IN

I/O

TTa

USART2_RX,

LPTIM1_IN1,

TIM2_CH1,

USART2_CTS,

TIM2_ETR,

LPUART1_RX,

COMP1_OUT

COMP1_INM,

ADC_IN0,

RTC_TAMP2/WKUP1

/CK_IN

6677

PA1

I/O

EVENTOUT,

LPTIM1_IN2,

TIM2_CH2,

I2C1_SMBA,

USART2_RTS_DE,

TIM21_ETR,

LPUART1_TX

COMP1_INP,

ADC_IN1

PA2

I/O

TTa

TIM21_CH1,

TIM2_CH3,

USART2_TX,

LPUART1_TX,

COMP2_OUT

COMP2_INM,

ADC_IN2,

RTC_TAMP3/RTC_T

S/RTC_OUT/WKUP3

STM32L021D4 Datasheet(PDF) 36 Page - STMicroelectronics

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