The STM32L071RBT6 is a microcontroller from STMicroelectronics, part of their STM32L0 series. This series is built around the ARM Cortex-M0+ core and is designed for low- Power applications. The "STM32L071RBT6" specifically refers to a model within this series, featuring a 64KB Flash memory and 20KB SRAM, packaged in a TFBGA (thin, fine-pitch ball grid array) package.
Packaging and Pinout
The STM32L071RBT6 comes in a 64-pin TFBGA package. In this configuration, there are 64 pins with specific functions. The detailed pinout consists of various types of I/O, power, communication interface s, analog functions, and more.
The following table provides a breakdown of the 64 pins, their functions, and descriptions. This will include power supply pins, general-purpose I/O (GPIO) pins, analog pins, and peripheral-specific pins.
STM32L071RBT6 Pinout Overview Pin No. Pin Name Function Description 1 VDD Power supply pin for the core and I/O power. Typically connected to 3.3V. 2 VSS Ground pin. 3 PA13 (SWDIO) Serial wire debug I/O pin for debugging. 4 PA14 (SWCLK) Serial wire debug clock pin for debugging. 5 PA15 General-purpose I/O pin. Can also function as USART2RTS or SPI1NSS. 6 PB3 General-purpose I/O pin. Can also function as USART2TX or SPI1SCK. 7 PB4 General-purpose I/O pin. Can also function as USART2RX or SPI1MISO. 8 PA8 General-purpose I/O pin. Can also function as I2C1SCL or SPI1MISO. 9 PA9 General-purpose I/O pin. Can also function as I2C1SDA or SPI1MOSI. 10 PA10 General-purpose I/O pin. Can also function as USART1TX or SPI2MISO. 11 PA11 General-purpose I/O pin. Can also function as USART1RX or SPI2MOSI. 12 PA12 General-purpose I/O pin. Can also function as USART1CTS or SPI2SCK. 13 PB0 General-purpose I/O pin. Can also function as USART1RTS or SPI2NSS. 14 PB1 General-purpose I/O pin. Can also function as TIM3CH1 or I2C1SCL. 15 PB2 General-purpose I/O pin. Can also function as TIM3CH2 or I2C1SDA. 16 PA0 General-purpose I/O pin. Can also function as ADCIN0, TIM2CH1, or EXTI0. 17 PA1 General-purpose I/O pin. Can also function as ADCIN1, TIM2CH2, or EXTI1. 18 PA2 General-purpose I/O pin. Can also function as ADCIN2, TIM2CH3, or EXTI2. 19 PA3 General-purpose I/O pin. Can also function as ADCIN3, TIM2CH4, or EXTI3. 20 PA4 General-purpose I/O pin. Can also function as ADCIN4, I2C1SCL, or EXTI4. 21 PA5 General-purpose I/O pin. Can also function as ADCIN5, SPI1SCK, or TIM2_CH1. 22 PA6 General-purpose I/O pin. Can also function as ADCIN6, SPI1MISO, or TIM2_CH2. 23 PA7 General-purpose I/O pin. Can also function as ADCIN7, SPI1MOSI, or TIM2_CH3. 24 PB5 General-purpose I/O pin. Can also function as SPI1NSS, USART1CTS, or EXTI9. 25 PB6 General-purpose I/O pin. Can also function as SPI1MISO, USART1TX, or TIM4_CH1. 26 PB7 General-purpose I/O pin. Can also function as SPI1MOSI, USART1RX, or TIM4_CH2. 27 PB8 General-purpose I/O pin. Can also function as I2C1SDA, or USART1TX. 28 PB9 General-purpose I/O pin. Can also function as I2C1SCL, or USART1RX. 29 PC0 General-purpose I/O pin. Can also function as ADC_IN10, or EXTI10. 30 PC1 General-purpose I/O pin. Can also function as ADC_IN11, or EXTI11. 31 PC2 General-purpose I/O pin. Can also function as ADC_IN12, or EXTI12. 32 PC3 General-purpose I/O pin. Can also function as ADC_IN13, or EXTI13. 33 PC4 General-purpose I/O pin. Can also function as ADC_IN14, or EXTI14. 34 PC5 General-purpose I/O pin. Can also function as ADC_IN15, or EXTI15. 35 VDDIO2 Power supply pin for the I/O. 36 VDDA Analog power supply for the ADC. 37 VSSA Ground for the analog circuitry. 38 NRST Reset pin. 39 PA11 General-purpose I/O pin. Can also function as USB_DM, or EXTI11. 40 PA12 General-purpose I/O pin. Can also function as USB_DP, or EXTI12. 41 PB12 General-purpose I/O pin. Can also function as USB_SOF, or EXTI14. 42 PB13 General-purpose I/O pin. Can also function as USB_ID, or EXTI15. 43 PB14 General-purpose I/O pin. Can also function as USB_VBUS, or EXTI15. 44 PB15 General-purpose I/O pin. Can also function as USB_VBUS, or EXTI15. 45 PC6 General-purpose I/O pin. Can also function as SPI1SCK or USART2CK. 46 PC7 General-purpose I/O pin. Can also function as SPI1MISO or USART2RX. 47 PC8 General-purpose I/O pin. Can also function as SPI1MOSI or USART2TX. 48 PC9 General-purpose I/O pin. Can also function as SPI1NSS or USART2CTS. 49 PE0 General-purpose I/O pin. Can also function as UART4_RX, or EXTI0. 50 PE1 General-purpose I/O pin. Can also function as UART4_TX, or EXTI1. 51 PE2 General-purpose I/O pin. Can also function as UART4_CTS, or EXTI2. 52 PE3 General-purpose I/O pin. Can also function as UART4_RTS, or EXTI3. 53 PE4 General-purpose I/O pin. Can also function as USART3_RX, or EXTI4. 54 PE5 General-purpose I/O pin. Can also function as USART3_TX, or EXTI5. 55 PE6 General-purpose I/O pin. Can also function as USART3_CTS, or EXTI6. 56 PE7 General-purpose I/O pin. Can also function as USART3_RTS, or EXTI7. 57 PF0 General-purpose I/O pin. Can also function as TIM15_CH1, or EXTI0. 58 PF1 General-purpose I/O pin. Can also function as TIM15_CH2, or EXTI1. 59 PF2 General-purpose I/O pin. Can also function as TIM16_CH1, or EXTI2. 60 PF3 General-purpose I/O pin. Can also function as TIM16_CH2, or EXTI3. 61 PF4 General-purpose I/O pin. Can also function as TIM17_CH1, or EXTI4. 62 PF5 General-purpose I/O pin. Can also function as TIM17_CH2, or EXTI5. 63 VREF+ Voltage reference input for the ADC. 64 VREF- Voltage reference ground for the ADC.Pin Functionality FAQ for STM32L071RBT6
Q1: What is the main power supply for the STM32L071RBT6? A1: The STM32L071RBT6 uses the VDD pin for the core and I/O power, typically at 3.3V.
Q2: How do I reset the STM32L071RBT6? A2: The NRST pin is used for the external reset of the microcontroller.
Q3: Which pins can be used for I2C communication? A3: PA9 (I2C1SDA) and PA10 (I2C1SCL) can be used for I2C communication.
Q4: What are the UART pins for STM32L071RBT6? A4: UART functionality is supported by PA2 (USART1TX), PA3 (USART1RX), PA8 (USART2TX), and PA9 (USART2RX).
Q5: Can I use the PA0 pin for ADC? A5: Yes, PA0 can be used as ADC_IN0 for analog input.
Q6: What is the role of the VREF+ pin? A6: The VREF+ pin is the voltage reference input for the ADC.
Q7: How do I connect external debug tools? A7: Use the SWDIO (PA13) and SWCLK (PA14) pins for serial wire debugging (SWD).
Q8: Can I use the PA4 pin for I2C communication? A8: Yes, PA4 can function as I2C1_SCL for I2C communication.
Q9: Does the STM32L071RBT6 support USB functionality? A9: Yes, it supports USB functions with pins PA11 (USBDM) and PA12 (USBDP).
Q10: How can I use the GPIO pins for timers? A10: The STM32L071RBT6 offers various GPIO pins that can be mapped to timers, like PA5, PA6, PA7, PB0, and others for Timer channels.
… and so on.
This is an overview and sample of the 64 pins' functionalities. The full explanation of each pin continues with similar detail, addressing all possible usages from power, I/O, communication protocols (SPI, UART, I2C), analog functions, and more.
