Difference between revisions of "STM32L031K6 Microcontroller"

Latest revision as of 17:31, 26 July 2017

STM32L031K6 Microcontroller Overview

Ultra-low-power platform
- 1.65 V to 3.6 V power supply
- -40 to 125 °C temperature range
- 0.25 μA Standby mode (2 wakeup pins)
- 0.38 μA Stop mode (16 wakeup lines)
- 0.68 μA Stop mode + RTC + 8 KB RAM retention
- Down to 76 μA/MHz in Run mode
- 5 μs wakeup time (from Flash memory)
- 41 μA 12-bit ADC conversion (at 10ksps)
Core: ARM® 32-bit Cortex®-M0+
- From 32 kHz up to 32 MHz max.
- 0.95 DMIPS/MHz
- Ultra-safe, low-power BOR (brownout reset) with 5 selectable thresholds
- Ultralow power POR/PDR
- Programmable voltage detector (PVD)
Clock sources
- 1 to 25 MHz crystal oscillator
- 32 kHz oscillator for RTC with calibration
- High speed internal 16 MHz factory-trimmed RC (+/- 1%)
- Internal low-power 37 kHz RC
- Internal multispeed low-power 65 kHz to 4.2 MHz RC
- PLL for CPU clock
Pre-programmed bootloader
- USART, SPI supported
Development support
- Serial wire debug supported
Up to 38 fast I/Os (31 I/Os 5V tolerant)
Memories
- Up to 32 KB Flash with ECC
- 8 KB RAM
- 1 KB of data EEPROM with ECC
- 20-byte backup register
- Sector protection against R/W operation
Rich Analog peripherals
- 12-bit ADC 1.14 Msps up to 10 channels (down to 1.65 V)
- 2x ultra-low-power comparators (window mode and wake up capability, down to 1.8 V)
7-channel DMA controller, supporting ADC, SPI, I2C, USART, Timers
5x peripherals communication interface
1x USART (ISO 7816, IrDA), 1x UART (low power)
1x SPI 16 Mbits/s
1x I2C (SMBus/PMBus)
8x timers: 1x 16-bit with up to 4 channels, 2x 16-bit with up to 2 channels, 1x 16-bit ultra-low-power timer, 1x SysTick, 1x RTC and 2x watchdogs (independent/window)
CRC calculation unit, 96-bit unique ID
All packages are ECOPACK®2

STM32L031K6 block diagram

STM32L031K6 clock tree

STM32L031K6 system architecture
Note:

only serial controllers USART2 and LPUART1 are available on the LQFP32 package
Only one I²C controller (I2C1) is available on the LQFP32 package
Only one SPI controller (SPI1) is available on the LQFP32 package

Documents and files

Datasheet
Specifications
Getting started
Reference manual
Programming manual
Errata
Getting started with STM32F0 or STM32L0 series
Cortex-M0+ Technical Reference Manual
Virtually increasing the number of serial communication peripherals in STM32 applications
Guidelines to increase the number of touch sensing touchkeys

Pinout

Alternate function mapping

All dark grey text indicates that the pin is not available on the LQFP32

**Alternate Functions for available pins on chip**
Pin	AF0 (SPI1 USART2 LPTIM TIM21 EVENTOUT SYS_AF)	AF1 (SPI1 I2C1 LPTIM)	AF2 (LPTIM TIM2 EVENTOUT SYS_AF)	AF3 (I2C1 EVENTOUT)	AF4 (I2C1 USART2 LPUART1 TIM22 EVENTOUT)	AF5 (TIM2 TIM21 TIM22)	AF6 (LPUART1 EVENTOUT)	AF7 (COMP1 COMP2)	Additional functions
PA0		LPTIM1_IN1	TIM2_CH1		USART2_CTS	TIM2_ETR		COMP1_OUT	COMP1_INM6 ADC_IN0 RTC_TAMP2 WKUP1
PA1	EVENTOUT	LPTIM1_IN2	TIM2_CH2	I2C1_SMBA	USART2_RTS	TIM21_ETR			COMP1_INP ADC_IN1
PA2	TIM21_CH1		TIM2_CH3		USART2_TX		LPUART1_TX	COMP2_OUT	COMP2_INM6 ADC_IN2 RTC_TAMP3 RTC_TS RTC_OUT WKUP3
PA3	TIM21_CH2		TIM2_CH4		USART2_RX		LPUART1_RX		COMP2_INP ADC_IN3
PA4	SPI1_NSS	LPTIM1_IN1			USART2_CK	TIM22_ETR			COMP1_INM4 COMP2_INM4 ADC_IN4
PA5	SPI1_SCK	LPTIM1_IN2	TIM2_ETR			TIM2_CH1			COMP1_INM5 COMP2_INM5 ADC_IN5
PA6	SPI1_MISO	LPTIM1_ETR			LPUART1_CTS	TIM22_CH1	EVENTOUT	COMP1_OUT	ADC_IN6
PA7	SPI1_MOSI	LPTIM1_OUT			USART2_CTS	TIM22_CH2	EVENTOUT	COMP2_OUT	ADC_IN7
PA8	MCO		LPTIM1_IN1	EVENTOUT	USART2_CK	TIM2_CH1
PA9	MCO	I2C1_SCL			USART2_TX	TIM22_CH1
PA10		I2C1_SDA			USART2_RX	TIM22_CH2
PA11	SPI1_MISO		EVENTOUT		USART2_CTS	TIM21_CH2		COMP1_OUT
PA12	SPI1_MOSI		EVENTOUT		USART2_RTS			COMP2_OUT
PA13	SWDIO	LPTIM1_ETR					LPUART1_RX
PA14	SWCLK	LPTIM1_OUT		I2C1_SMBA	USART2_TX		LPUART1_TX
PA15	SPI1_NSS		TIM2_ETR	EVENTOUT	USART2_RX	TIM2_CH1
PB0	EVENTOUT	SPI1_MISO			USART2_RTS	TIM2_CH3			ADC_IN8 VREF_OUT
PB1	USART2_CK	SPI1_MOSI			LPUART1_RTS	TIM2_CH4			ADC_IN9 VREF_OUT
PB2			LPTIM1_OUT
PB3	SPI1_SCK		TIM2_CH2		EVENTOUT				COMP2_INN
PB4	SPI1_MISO		EVENTOUT		TIM22_CH1				COMP2_INP
PB5	SPI1_MOSI		LPTIM1_IN1	I2C1_SMBA	TIM22_CH2				COMP2_INP
PB6	USART2_TX	I2C1_SCL	LPTIM1_ETR			TIM21_CH1			COMP2_INP
PB7	USART2_RX	I2C1_SDA	LPTIM1_IN2						COMP2_INP VREF_PVD_IN
PB8					I2C1_SCL
PB9			EVENTOUT		I2C1_SDA
PB10			TIM2_CH3				LPUART1_TX
PB11	EVENTOUT		TIM2_CH4				LPUART1_RX
PB12	SPI1_NSS						EVENTOUT
PB13	SPI1_SCK		MCO			TIM21_CH1	LPUART1_CTS
PB14	SPI1_MISO		RTC_OUT			TIM21_CH2	LPUART1_RTS
PB15	SPI1_MOSI		RTC_REFIN
PC0	LPTIM1_IN1		EVENTOUT				LPUART1_RX
PC14									OSC32_IN
PC15									OSC32_OUT
PH0
PH1

NUCLEO-L031K6 development Board Overview

Front	Back	Dimentions

Packaging literature

Front	Back

Features

STM32 microcontrollers in 32-pin packages
Extension with Arduino™ nano connectivity
ARM® mbed™ -enabled (see http://mbed.org)
On-board ST-LINK/V2-1 debugger/programmer with SWD connector:
- USB VBUS
- External source
Three LEDs:
- USB communication (LD1), power LED (LD2), user LED (LD3)
Reset push-button
Supported by wide choice of Integrated Development Environments (IDEs) including IAR™ , Keil® , GCC-based IDEs (AC6 SW4STM32, ...)

Documents and files

Specifications
Getting started with STM32 Nucleo board software development tools
User manual
Schematic

Board Layout

Top	Bottom

Pinout

Available pins on board

**Available pins on board**
Bit	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
Port A	PA0	PA1	PA2	PA3	PA4	PA5	PA6	PA7	PA8	PA9	PA10	PA11	PA12
Port B	PB0	PB1		PB3	PB4	PB5	PB6	PB7
Port C	PC14	PC15

Solder Bridges

Solder Bridge	fitted	connects
SB1	no	power configuration
SB2	yes	connects VCP-TX (PA2) to ST-LINK
SB3	yes	connects VCP-RX (PA15 - not broken out) to ST-LINK
SB4	no	connects PC14 to MCO
SB5	yes	connects PC14 to X1 (32.768KHz Xtal)
SB6	no	connects PC14 to PC15 (shorts OSC32_IN to OSC32_OUT)
SB7	yes	connects PC15 to X1 (32.768KHz Xtal)
SB8	no	connects PC15 to PC14 (shorts OSC32_IN to OSC32_OUT)
SB9	yes	ST-LINK reset
SB10	yes	connects VDD to STM32 pin VDDA
SB11	yes	connects STM32 pin VSS to GND
SB12	yes	connects BOOT0 to GND
SB13	yes	connects GND to STM32 pin VDDA
SB14	yes	connects 3.3V regulator output to +3V3/VDD
SB15	yes	connects PB3 to LD3 (Green LED)
SB16	yes	connects PB6 to PA6
SB17	no	connects PA0 to MCO
SB18	yes	connects PB7 to PA5

PCB IO map

**IO connections**
STM32 pin	Board pin name	Board pin number	Direction	Connected to	Alternate & additional functions see complete AF list	Notes
PA0	A0	CN4.12	↔	?	ADC_IN0
PA1	A1	CN4.11	↔	?	ADC_IN1 COMP1_INP
PA2	A7	CN4.5	→	VCP TX	ADC_IN2 COMP2_INM6
PA3	A2	CN4.10	↔	?	ADC_IN3 COMP2_INP
PA4	A3	CN4.9	↔	?	ADC_IN4 COMP1_INM4 COMP2_INM4
PA5	A4	CN4.8	↔	PB7 via SB18	ADC_IN5 I2C1_SDA COMP1_INM5 COMP2_INM5	Limitations on A4 and A5, D4 and D5 related to I²C configuration are explained in Section 6.8: Solder bridges according to SB16/SB18 setting.
PA6	A5	CN4.7	↔	PB6 via SB16	ADC_IN6 I2C1_SCL	Limitations on A4 and A5, D4 and D5 related to I²C configuration are explained in Section 6.8: Solder bridges according to SB16/SB18 setting.
PA7	A6	CN4.6	↔	?	ADC_IN7
PA8	D9	CN3.12	↔	?	TIM2_CH1
PA9	D1	CN3.1	→	?	USART2_TX	Only one USART is available and it is shared between Arduino Nano and VCP. The selection is done by remapping (no need to change the hardware configuration).
PA10	D0	CN3.2	←	?	USART2_RX	Only one USART is available and it is shared between Arduino Nano and VCP. The selection is done by remapping (no need to change the hardware configuration).
PA11	D10	CN3.13	↔	?	SPI_CS TIM21_CH2	SPI_CS is made by GPIO.
PA12	D2	CN3.5	↔	?
PB0	D3	CN3.6	↔	?	TIM2_CH3 ADC_IN8 VREF_OUT
PB1	D6	CN3.9	↔	?	TIM2_CH4 ADC_IN9 VREF_OUT
PB3	D13	CN4.15	→	LED green	SPI1_SCK COMP2_INN
PB4	D12	CN3.15	↔	?	SPI1_MISO COMP2_INP
PB5	D11	CN3.14	↔	?	SPI1_MOSI TIM22_CH2 COMP2_INP
PB6	D5	CN3.8	↔	PA6 via SB16	TIM21_CH1 COMP2_INP	Limitations on A4 and A5, D4 and D5 related to I 2 C configuration are explained in Section 6.8: Solder bridges according to SB16/SB18 setting.
PB7	D4	CN3.7	↔	PA5 via SB18	COMP2_INP VREF_PVD_IN	Limitations on A4 and A5, D4 and D5 related to I 2 C configuration are explained in Section 6.8: Solder bridges according to SB16/SB18 setting.
PC14	D7	CN3.10	←	32.768KHz Xtal via SB5		D7/D8 shared with OSC_IN/OSC_OUT.
PC15	D8	CN3.11	→	32.768KHz Xtal via SB7		D7/D8 shared with OSC_IN/OSC_OUT.

Note PA15 is the VCP RX, but is not broken out to a PCB pin.

Schematic

STM32L031K6 to ST-Link

STM32L031K6, power, and breakout

STM32F103CBT6 based ST-Link

Difference between revisions of "STM32L031K6 Microcontroller"

Latest revision as of 17:31, 26 July 2017

Contents

STM32L031K6 Microcontroller Overview

Documents and files

Pinout

Alternate function mapping

NUCLEO-L031K6 development Board Overview

Packaging literature

Features

Documents and files

Board Layout

Pinout

Available pins on board

Solder Bridges

PCB IO map

Schematic

Navigation menu

Views

Personal tools

Contents

Science Zero

Search

Tools

@@ Line 1: / Line 1: @@
 == [http://www.st.com/content/st_com/en/products/microcontrollers/stm32-32-bit-arm-cortex-mcus/stm32l0-series/stm32l0x1/stm32l031k6.html STM32L031K6 Microcontroller Overview] ==
-[[File:STM32F031K6 chip.JPG|320px]]
+[[File:STM32L031K6 chip.JPG|320px]]
@@ Line 49: / Line 49: @@
-'''STM32F031K6 block diagram'''<br />
+'''STM32L031K6 block diagram'''<br />
-[[File:STM32F031K6 block diagram.JPG|320px]]
+[[File:STM32L031K6 block diagram.JPG|640px]]
-'''STM32F031K6 clock tree'''<br />
+'''STM32L031K6 clock tree'''<br />
-[[File:STM32F031K6 clock tree.JPG|320px]]
+[[File:STM32L031K6 clock tree.JPG|640px]]
+'''STM32L031K6 system architecture'''<br />
+Note:<br />
+*only serial controllers USART2 and LPUART1 are available on the LQFP32 package
+*Only one I<sup>2</sup>C controller (I2C1) is available on the LQFP32 package
+*Only one SPI controller (SPI1) is available on the LQFP32 package<br />
+[[File:STM32L031K6 system architecture.JPG|640px]]
 === Documents and files ===
@@ Line 64: / Line 73: @@
 [http://www.st.com/resource/en/errata_sheet/dm00182885.pdf Errata]<br />
 [http://www.st.com/resource/en/product_presentation/gt_stm32f0-l0.pdf Getting started with STM32F0 or STM32L0 series]<br />
+[http://infocenter.arm.com/help/topic/com.arm.doc.ddi0484b/DDI0484B_cortex_m0p_r0p0_trm.pdf Cortex-M0+ Technical Reference Manual]<br />
 [http://www.st.com/resource/en/application_note/dm00160482.pdf Virtually increasing the number of serial communication peripherals in STM32 applications]<br />
 [http://www.st.com/resource/en/application_note/cd00276277.pdf Guidelines to increase the number of touch sensing touchkeys]
 === Pinout ===
-[[File:STM32F031K6 pinout.JPG|320px]]
+[[File:STM32L031K6 pinout.JPG|320px]]
 ===Alternate function mapping===
+All <span style="color:darkgrey">dark grey</span> text indicates that the pin is not available on the LQFP32
 {| border="1" cellspacing="0"
 |+ '''Alternate Functions for available pins on chip'''
 ! Pin
-! AF0
+! AF0<br >
-! AF1
+(SPI1<br >
-! AF2
+USART2<br >
-! AF3
+LPTIM<br >
-! AF4
+TIM21<br >
-! AF5
+EVENTOUT<br >
-! AF6
+SYS_AF)
-! AF7
+! AF1<br />
+(SPI1<br />
+I2C1<br />
+LPTIM)
+! AF2<br />
+(LPTIM<br />
+TIM2<br />
+EVENTOUT<br />
+SYS_AF)
+! AF3<br />
+(I2C1<br />
+EVENTOUT)
+! AF4<br />
+(I2C1<br />
+USART2<br />
+LPUART1<br />
+TIM22<br />
+EVENTOUT)
+! AF5<br />
+(TIM2<br />
+TIM21<br />
+TIM22)
+! AF6<br />
+(LPUART1<br />
+EVENTOUT)
+! AF7<br />
+(COMP1<br />
+COMP2)
 ! Additional functions
 |-
 !bgcolor="#FFFFFF" | PA0
 |bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" | USART1_CTS
+|bgcolor="#FFFFFF" | LPTIM1_IN1
-|bgcolor="#FFFFFF" | TIM2_CH1_ETR
+|bgcolor="#FFFFFF" | TIM2_CH1
-|bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | USART2_CTS
+|bgcolor="#FFFFFF" | TIM2_ETR
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | COMP1_OUT
 |bgcolor="#FFFFFF" |
+COMP1_INM6<br />
 ADC_IN0<br />
 RTC_TAMP2<br />
@@ Line 100: / Line 140: @@
 !bgcolor="#FFFFFF" | PA1
 |bgcolor="#FFFFFF" | EVENTOUT
-|bgcolor="#FFFFFF" | USART1_RTS
+|bgcolor="#FFFFFF" | LPTIM1_IN2
 |bgcolor="#FFFFFF" | TIM2_CH2
+|bgcolor="#FFFFFF" | I2C1_SMBA
+|bgcolor="#FFFFFF" | USART2_RTS
+|bgcolor="#FFFFFF" | TIM21_ETR
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" |
+COMP1_INP<br />
-|bgcolor="#FFFFFF" |
+ADC_IN1
-|bgcolor="#FFFFFF" | ADC_IN1
 |-
 !bgcolor="#FFFFFF" | PA2
+|bgcolor="#FFFFFF" | TIM21_CH1
 |bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" | USART1_TX
 |bgcolor="#FFFFFF" | TIM2_CH3
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | USART2_TX
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | LPUART1_TX
+|bgcolor="#FFFFFF" | COMP2_OUT
 |bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" |
+COMP2_INM6<br />
-|bgcolor="#FFFFFF" |
+ADC_IN2<br />
-|bgcolor="#FFFFFF" | ADC_IN2
+RTC_TAMP3<br />
+RTC_TS<br />
+RTC_OUT<br />
+WKUP3
 |-
 !bgcolor="#FFFFFF" | PA3
+|bgcolor="#FFFFFF" | TIM21_CH2
 |bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" | USART1_RX
+|bgcolor="#FFFFFF" | TIM2_CH4
-|bgcolor="#FFFFFF" | TIM2_CH4
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | USART2_RX
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | LPUART1_RX
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" |
+COMP2_INP<br />
-|bgcolor="#FFFFFF" | ADC_IN3
+ADC_IN3
 |-
 !bgcolor="#FFFFFF" | PA4
+|bgcolor="#FFFFFF" | SPI1_NSS
+|bgcolor="#FFFFFF" | LPTIM1_IN1
 |bgcolor="#FFFFFF" |
-SPI1_NSS<br />
-I2S1_WS
-|bgcolor="#FFFFFF" | USART1_CK
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | USART2_CK
+|bgcolor="#FFFFFF" | TIM22_ETR
 |bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" | TIM14_CH1
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" |
+COMP1_INM4<br />
-|bgcolor="#FFFFFF" | ADC_IN4
+COMP2_INM4<br />
+ADC_IN4
 |-
 !bgcolor="#FFFFFF" | PA5
-|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | SPI1_SCK
-SPI1_SCK<br />
+|bgcolor="#FFFFFF" | LPTIM1_IN2
-I2S1_CK
+|bgcolor="#FFFFFF" | TIM2_ETR
-|bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" | TIM2_CH1_ETR
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | TIM2_CH1
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" | ADC_IN5
+COMP1_INM5<br />
+COMP2_INM5<br />
+ADC_IN5
 |-
 !bgcolor="#FFFFFF" | PA6
+|bgcolor="#FFFFFF" | SPI1_MISO
+|bgcolor="#FFFFFF" | LPTIM1_ETR
 |bgcolor="#FFFFFF" |
-SPI1_MISO<br />
-I2S1_MCK
-|bgcolor="#FFFFFF" | TIM3_CH1
-|bgcolor="#FFFFFF" | TIM1_BKIN
 |bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | LPUART1_CTS
-|bgcolor="#FFFFFF" | TIM16_CH1
+|bgcolor="#FFFFFF" | TIM22_CH1
 |bgcolor="#FFFFFF" | EVENTOUT
-|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | COMP1_OUT
 |bgcolor="#FFFFFF" | ADC_IN6
 |-
 !bgcolor="#FFFFFF" | PA7
+|bgcolor="#FFFFFF" | SPI1_MOSI
+|bgcolor="#FFFFFF" | LPTIM1_OUT
 |bgcolor="#FFFFFF" |
-SPI1_MOSI<br />
-I2S1_SD
-|bgcolor="#FFFFFF" | TIM3_CH2
-|bgcolor="#FFFFFF" | TIM1_CH1N
 |bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" | TIM14_CH1
+|bgcolor="#FFFFFF" | USART2_CTS
-|bgcolor="#FFFFFF" | TIM17_CH1
+|bgcolor="#FFFFFF" | TIM22_CH2
 |bgcolor="#FFFFFF" | EVENTOUT
-|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | COMP2_OUT
 |bgcolor="#FFFFFF" | ADC_IN7
 |-
 !bgcolor="#FFFFFF" | PA8
 |bgcolor="#FFFFFF" | MCO
-|bgcolor="#FFFFFF" | USART1_CK
+|bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" | TIM1_CH1
+|bgcolor="#FFFFFF" | LPTIM1_IN1
 |bgcolor="#FFFFFF" | EVENTOUT
-|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | USART2_CK
-|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | TIM2_CH1
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
@@ Line 195: / Line 243: @@
 |-
 !bgcolor="#FFFFFF" | PA9
+|bgcolor="#FFFFFF" | MCO
+|bgcolor="#FFFFFF" | I2C1_SCL
 |bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" | USART1_TX
-|bgcolor="#FFFFFF" | TIM1_CH2
-|bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" | I2C1_SCL
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | USART2_TX
+|bgcolor="#FFFFFF" | TIM22_CH1
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
@@ Line 206: / Line 254: @@
 |-
 !bgcolor="#FFFFFF" | PA10
-|bgcolor="#FFFFFF" | TIM17_BKIN
-|bgcolor="#FFFFFF" | USART1_RX
-|bgcolor="#FFFFFF" | TIM1_CH3
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" | I2C1_SDA
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | USART2_RX
+|bgcolor="#FFFFFF" | TIM22_CH2
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
@@ Line 217: / Line 265: @@
 |-
 !bgcolor="#FFFFFF" | PA11
+|bgcolor="#FFFFFF" | SPI1_MISO
+|bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" | EVENTOUT
-|bgcolor="#FFFFFF" | USART1_CTS
-|bgcolor="#FFFFFF" | TIM1_CH4
-|bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | USART2_CTS
+|bgcolor="#FFFFFF" | TIM21_CH2
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | COMP1_OUT
 |bgcolor="#FFFFFF" |
 |-
 !bgcolor="#FFFFFF" | PA12
+|bgcolor="#FFFFFF" | SPI1_MOSI
+|bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" | EVENTOUT
-|bgcolor="#FFFFFF" | USART1_RTS
-|bgcolor="#FFFFFF" | TIM1_ETR
-|bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | USART2_RTS
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | COMP2_OUT
 |bgcolor="#FFFFFF" |
 |-
 !bgcolor="#FFFFFF" | PA13
 |bgcolor="#FFFFFF" | SWDIO
-|bgcolor="#FFFFFF" | IR_OUT
+|bgcolor="#FFFFFF" | LPTIM1_ETR
-|bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | LPUART1_RX
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
@@ Line 251: / Line 299: @@
 !bgcolor="#FFFFFF" | PA14
 |bgcolor="#FFFFFF" | SWCLK
-|bgcolor="#FFFFFF" | USART1_TX
+|bgcolor="#FFFFFF" | LPTIM1_OUT
-|bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | I2C1_SMBA
+|bgcolor="#FFFFFF" | USART2_TX
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | LPUART1_TX
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
 |-
 !bgcolor="#FFFFFF" | PA15
+|bgcolor="#FFFFFF" | SPI1_NSS
 |bgcolor="#FFFFFF" |
-SPI1_NSS<br />
+|bgcolor="#FFFFFF" | TIM2_ETR
-I2S1_WS
-|bgcolor="#FFFFFF" | USART1_RX
-|bgcolor="#FFFFFF" | TIM2_CH1_ETR
 |bgcolor="#FFFFFF" | EVENTOUT
-|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | USART2_RX
-|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | TIM2_CH1
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
@@ Line 275: / Line 321: @@
 !bgcolor="#F0F0F0" | PB0
 |bgcolor="#F0F0F0" | EVENTOUT
-|bgcolor="#F0F0F0" | TIM3_CH3
+|bgcolor="#F0F0F0" | SPI1_MISO
-|bgcolor="#F0F0F0" | TIM1_CH2N
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | USART2_RTS
+|bgcolor="#F0F0F0" | TIM2_CH3
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
-|bgcolor="#F0F0F0" | ADC_IN8
+ADC_IN8<br />
+VREF_OUT
 |-
 !bgcolor="#F0F0F0" | PB1
-|bgcolor="#F0F0F0" | TIM14_CH1
+|bgcolor="#F0F0F0" | USART2_CK
-|bgcolor="#F0F0F0" | TIM3_CH4
+|bgcolor="#F0F0F0" | SPI1_MOSI
-|bgcolor="#F0F0F0" | TIM1_CH3N
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | LPUART1_RTS
+|bgcolor="#F0F0F0" | TIM2_CH4
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
-|bgcolor="#F0F0F0" | ADC_IN9
+ADC_IN9<br />
+VREF_OUT
 |-
-!bgcolor="#F0F0F0" | PB2
+!bgcolor="#F0F0F0" | <span style="color:darkgrey">PB2</span>
-|bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">LPTIM1_OUT</span>
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
@@ Line 308: / Line 358: @@
 !bgcolor="#F0F0F0" | PB3
 |bgcolor="#F0F0F0" | SPI1_SCK
-I2S1_CK
+|bgcolor="#F0F0F0" |
-|bgcolor="#F0F0F0" | EVENTOUT
 |bgcolor="#F0F0F0" | TIM2_CH2
 |bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | EVENTOUT
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
-|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | COMP2_INN
-|bgcolor="#F0F0F0" |
 |-
 !bgcolor="#F0F0F0" | PB4
+|bgcolor="#F0F0F0" | SPI1_MISO
 |bgcolor="#F0F0F0" |
-SPI1_MISO<br />
-I2S1_MCK
-|bgcolor="#F0F0F0" | TIM3_CH1
 |bgcolor="#F0F0F0" | EVENTOUT
 |bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | TIM22_CH1
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
-|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | COMP2_INP
-|bgcolor="#F0F0F0" |
 |-
 !bgcolor="#F0F0F0" | PB5
+|bgcolor="#F0F0F0" | SPI1_MOSI
 |bgcolor="#F0F0F0" |
-SPI1_MOSI<br />
+|bgcolor="#F0F0F0" | LPTIM1_IN1
-I2S1_SD
-|bgcolor="#F0F0F0" | TIM3_CH2
-|bgcolor="#F0F0F0" | TIM16_BKIN
 |bgcolor="#F0F0F0" | I2C1_SMBA
+|bgcolor="#F0F0F0" | TIM22_CH2
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
-|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | COMP2_INP
-|bgcolor="#F0F0F0" |
 |-
 !bgcolor="#F0F0F0" | PB6
-|bgcolor="#F0F0F0" | USART1_TX
+|bgcolor="#F0F0F0" | USART2_TX
 |bgcolor="#F0F0F0" | I2C1_SCL
-|bgcolor="#F0F0F0" | TIM16_CH1N
+|bgcolor="#F0F0F0" | LPTIM1_ETR
-|bgcolor="#F0F0F0" |
-|bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | TIM21_CH1
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | COMP2_INP
 |-
 !bgcolor="#F0F0F0" | PB7
-|bgcolor="#F0F0F0" | USART1_RX
+|bgcolor="#F0F0F0" | USART2_RX
 |bgcolor="#F0F0F0" | I2C1_SDA
-|bgcolor="#F0F0F0" | TIM17_CH1N
+|bgcolor="#F0F0F0" | LPTIM1_IN2
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
@@ Line 365: / Line 410: @@
 |bgcolor="#F0F0F0" |
 |bgcolor="#F0F0F0" |
+COMP2_INP<br />
+VREF_PVD_IN
 |-
-!bgcolor="#FFFFFF" | PF0
+!bgcolor="#F0F0F0" | <span style="color:darkgrey">PB8</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">I2C1_SCL</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|-
+!bgcolor="#F0F0F0" | <span style="color:darkgrey">PB9</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">EVENTOUT</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">I2C1_SDA</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|-
+!bgcolor="#F0F0F0" | <span style="color:darkgrey">PB10</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">TIM2_CH3</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">LPUART1_TX</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|-
+!bgcolor="#F0F0F0" | <span style="color:darkgrey">PB11</span>
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">EVENTOUT</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">TIM2_CH4</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">LPUART1_RX</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|-
+!bgcolor="#F0F0F0" | <span style="color:darkgrey">PB12</span>
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">SPI1_NSS</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">EVENTOUT</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|-
+!bgcolor="#F0F0F0" | <span style="color:darkgrey">PB13</span>
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">SPI1_SCK</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">MCO</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">TIM21_CH1</span>
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">LPUART1_CTS</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|-
+!bgcolor="#F0F0F0" | <span style="color:darkgrey">PB14</span>
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">SPI1_MISO</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">RTC_OUT</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">TIM21_CH2</span>
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">LPUART1_RTS</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|-
+!bgcolor="#F0F0F0" | <span style="color:darkgrey">PB15</span>
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">SPI1_MOSI</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" | <span style="color:darkgrey">RTC_REFIN</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|-
+!bgcolor="#FFFFFF" | <span style="color:darkgrey">PC0</span>
+|bgcolor="#FFFFFF" | <span style="color:darkgrey">LPTIM1_IN1</span>
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | <span style="color:darkgrey">EVENTOUT</span>
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | <span style="color:darkgrey">LPUART1_RX</span>
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
+|-
+!bgcolor="#FFFFFF" | PC14
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" | OSC_IN
+|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" |
+|bgcolor="#FFFFFF" | OSC32_IN
 |-
-!bgcolor="#FFFFFF" | PF1
+!bgcolor="#FFFFFF" | PC15
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
@@ Line 386: / Line 532: @@
 |bgcolor="#FFFFFF" |
 |bgcolor="#FFFFFF" |
-|bgcolor="#FFFFFF" | OSC_OUT
+|bgcolor="#FFFFFF" | OSC32_OUT
+|-
+!bgcolor="#F0F0F0" | <span style="color:darkgrey">PH0</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|-
+!bgcolor="#F0F0F0" | <span style="color:darkgrey">PH1</span>
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
+|bgcolor="#F0F0F0" |
 |}
@@ Line 423: / Line 591: @@
 ==Documents and files==
-[http://www.st.com/content/ccc/resource/technical/document/data_brief/b1/d8/13/d4/b0/b7/4b/6e/DM00214578.pdf/files/DM00214578.pdf/jcr:content/translations/en.DM00214578.pdf STM32 Nucleo-32 board specifications]<br />
+[http://www.st.com/resource/en/data_brief/nucleo-f031k6.pdf Specifications]<br />
 [http://www.st.com/resource/en/user_manual/dm00105928.pdf Getting started with STM32 Nucleo board software development tools]<br />
 [http://www.st.com/resource/en/user_manual/dm00231744.pdf User manual]<br />
-[http://www.st.com/resource/en/schematic_pack/nucleo-32pins_sch.zip Shematic]
+[http://www.st.com/resource/en/schematic_pack/nucleo-32pins_sch.zip Schematic]
 ==Board Layout==
@@ Line 462: / Line 630: @@
 |-
 | '''Port A'''
-| PA0
+| <span style="color:green">PA0</span>
-| PA1
+| <span style="color:green">PA1</span>
 | PA2
-| PA3
+| <span style="color:green">PA3</span>
-| PA4
+| <span style="color:green">PA4</span>
-| PA5
+| <span style="color:orange">PA5</span>
-| PA6
+| <span style="color:orange">PA6</span>
-| PA7
+| <span style="color:green">PA7</span>
-| PA8
+| <span style="color:green">PA8</span>
-| PA9
+| <span style="color:green">PA9</span>
-| PA10
+| <span style="color:green">PA10</span>
-| PA11
+| <span style="color:green">PA11</span>
-| PA12
+| <span style="color:green">PA12</span>
 |
 |
@@ Line 480: / Line 648: @@
 |-
 | '''Port B'''
-| PB0
+| <span style="color:green">PB0</span>
-| PB1
+| <span style="color:green">PB1</span>
 |
 | PB3
-| PB4
+| <span style="color:green">PB4</span>
-| PB5
+| <span style="color:green">PB5</span>
-| PB6
+| <span style="color:orange">PB6</span>
-| PB7
+| <span style="color:orange">PB7</span>
 |
 |
@@ Line 497: / Line 665: @@
 |
 |-
-| '''Port F'''
+| '''Port C'''
-| PF0
+| PC14
-| PF1
+| PC15
 |
 |
@@ Line 514: / Line 682: @@
 |
 |
+|}
+==Solder Bridges==
+{| class="wikitable" border="1" cellspacing="0" | style="text-align:left"
+| '''Solder Bridge'''
+| '''fitted'''
+| '''connects'''
+|-
+|SB1
+| no
+| power configuration
+|-
+|SB2
+| '''yes'''
+| connects VCP-TX (PA2) to ST-LINK
+|-
+|SB3
+| '''yes'''
+| connects VCP-RX (PA15 - not broken out) to ST-LINK
+|-
+|SB4
+| no
+| connects PC14 to MCO
+|-
+|SB5
+| '''yes'''
+| connects PC14 to X1 (32.768KHz Xtal)
+|-
+|SB6
+| no
+| connects PC14 to PC15 (shorts OSC32_IN to OSC32_OUT)
+|-
+|SB7
+| '''yes'''
+| connects PC15 to X1 (32.768KHz Xtal)
+|-
+|SB8
+| no
+| connects PC15 to PC14 (shorts OSC32_IN to OSC32_OUT)
+|-
+|SB9
+| '''yes'''
+| ST-LINK reset
+|-
+|SB10
+| '''yes'''
+| connects VDD to STM32 pin VDDA
+|-
+|SB11
+| '''yes'''
+| connects STM32 pin VSS to GND
+|-
+|SB12
+| '''yes'''
+| connects BOOT0 to GND
+|-
+|SB13
+| '''yes'''
+| connects GND to STM32 pin VDDA
+|-
+|SB14
+| '''yes'''
+| connects 3.3V regulator output to +3V3/VDD
+|-
+|SB15
+| '''yes'''
+| connects PB3 to LD3 (<span style="color:green">Green LED</span>)
+|-
+|SB16
+| '''yes'''
+| <span style="color:red">connects PB6 to PA6</span>
+|-
+|SB17
+| no
+| connects PA0 to MCO
+|-
+|SB18
+| '''yes'''
+| <span style="color:red">connects PB7 to PA5</span>
 |}
@@ Line 524: / Line 771: @@
 | align="center" | '''Direction'''
 | align="center" | '''Connected to'''
-| align="center" | '''Alternate functions'''
+| align="center" | '''Alternate & additional functions'''<br />see [[STM32L031K6 Microcontroller#Alternate function mapping|complete AF list]]
 | align="center" | '''Notes'''
 |-
@@ Line 545: / Line 792: @@
 | bgcolor="#FFFFFF" |
 *ADC_IN1
+*COMP1_INP
 | bgcolor="#FFFFFF" |
 |-
@@ Line 555: / Line 803: @@
 | bgcolor="#FFFFFF" |
 *ADC_IN2
+*COMP2_INM6
 | bgcolor="#FFFFFF" |
 |-
@@ Line 565: / Line 814: @@
 | bgcolor="#FFFFFF" |
 *ADC_IN3
+*COMP2_INP
 | bgcolor="#FFFFFF" |
 |-
@@ Line 575: / Line 825: @@
 | bgcolor="#FFFFFF" |
 *ADC_IN4
+*COMP1_INM4
+*COMP2_INM4
 | bgcolor="#FFFFFF" |
 |-
@@ Line 582: / Line 834: @@
 | bgcolor="#FFFFFF" align="center" | &harr;
 | bgcolor="#FFFFFF" |
-*?
+*<span style="color:red">PB7 via SB18</span>
 | bgcolor="#FFFFFF" |
 *ADC_IN5
 *I2C1_SDA
+*COMP1_INM5
+*COMP2_INM5
 | bgcolor="#FFFFFF" | Limitations on A4 and A5, D4 and D5 related to  I<sup>2</sup>C configuration are explained in Section 6.8: Solder bridges according to SB16/SB18 setting.
 |-
@@ Line 593: / Line 847: @@
 | bgcolor="#FFFFFF" align="center" | &harr;
 | bgcolor="#FFFFFF" |
-*?
+*<span style="color:red">PB6 via SB16</span>
 | bgcolor="#FFFFFF" |
 *ADC_IN6
@@ Line 616: / Line 870: @@
 *?
 | bgcolor="#FFFFFF" |
-*TIM1_CH1
+*TIM2_CH1
 | bgcolor="#FFFFFF" |
 |-
@@ Line 626: / Line 880: @@
 *?
 | bgcolor="#FFFFFF" |
-*USART1_TX
+*USART2_TX
 | bgcolor="#FFFFFF" | Only one USART is available and it is shared between Arduino Nano and VCP. The selection is done by remapping (no need to change the hardware configuration).
 |-
@@ Line 636: / Line 890: @@
 *?
 | bgcolor="#FFFFFF" |
-*USART1_RX
+*USART2_RX
 | bgcolor="#FFFFFF" | Only one USART is available and it is shared between Arduino Nano and VCP. The selection is done by remapping (no need to change the hardware configuration).
 |-
@@ Line 647: / Line 901: @@
 | bgcolor="#FFFFFF" |
 *SPI_CS
-*TIM1_CH4
+*TIM21_CH2
 | bgcolor="#FFFFFF" | SPI_CS is made by GPIO.
 |-
@@ Line 666: / Line 920: @@
 *?
 | bgcolor="#F0F0F0" |
-*TIM3_CH3
+*TIM2_CH3
-*ADC_IN8 ?
+*ADC_IN8
+*VREF_OUT
 | bgcolor="#F0F0F0" |
 |-
@@ Line 677: / Line 932: @@
 *?
 | bgcolor="#F0F0F0" |
-*TIM14_CH1
+*TIM2_CH4
-*ADC_IN9 ?
+*ADC_IN9
+*VREF_OUT
 | bgcolor="#F0F0F0" |
 |-
@@ Line 684: / Line 940: @@
 | bgcolor="#F0F0F0" | D13
 | bgcolor="#F0F0F0" | CN4.15
-| bgcolor="#F0F0F0" align="center" | &harr;
+| bgcolor="#F0F0F0" align="center" | &rarr;
 | bgcolor="#F0F0F0" |
 *LED <span style="color:green">green</span>
 | bgcolor="#F0F0F0" |
 *SPI1_SCK
+*COMP2_INN
 | bgcolor="#F0F0F0" |
 |-
@@ Line 699: / Line 956: @@
 | bgcolor="#F0F0F0" |
 *SPI1_MISO
+*COMP2_INP
 | bgcolor="#F0F0F0" |
 |-
@@ Line 709: / Line 967: @@
 | bgcolor="#F0F0F0" |
 *SPI1_MOSI
-*TIM3_CH2
+*TIM22_CH2
+*COMP2_INP
 | bgcolor="#F0F0F0" |
 |-
@@ Line 717: / Line 976: @@
 | bgcolor="#F0F0F0" align="center" | &harr;
 | bgcolor="#F0F0F0" |
-*?
+*<span style="color:red">PA6 via SB16</span>
 | bgcolor="#F0F0F0" |
-*TIM16_CH1N
+*TIM21_CH1
-| bgcolor="#F0F0F0" | D5 PWM on inverted channel Timer 16.
+*COMP2_INP
+| bgcolor="#F0F0F0" | Limitations on A4 and A5, D4 and D5 related to  I 2 C configuration are explained in Section 6.8: Solder bridges according to SB16/SB18 setting.
 |-
 | bgcolor="#F0F0F0" | PB7
@@ Line 727: / Line 987: @@
 | bgcolor="#F0F0F0" align="center" | &harr;
 | bgcolor="#F0F0F0" |
-*?
+*<span style="color:red">PA5 via SB18</span>
-| bgcolor="#F0F0F0" |
 | bgcolor="#F0F0F0" |
+*COMP2_INP
+*VREF_PVD_IN
+| bgcolor="#F0F0F0" | Limitations on A4 and A5, D4 and D5 related to  I 2 C configuration are explained in Section 6.8: Solder bridges according to SB16/SB18 setting.
 |-
-| bgcolor="#FFFFFF" | PF0
+| bgcolor="#FFFFFF" | PC14
 | bgcolor="#FFFFFF" | D7
 | bgcolor="#FFFFFF" | CN3.10
-| bgcolor="#FFFFFF" align="center" | &harr;
+| bgcolor="#FFFFFF" align="center" | &larr;
 | bgcolor="#FFFFFF" |
-*?
+*32.768KHz Xtal via SB5
 | bgcolor="#FFFFFF" |
 | bgcolor="#FFFFFF" | D7/D8 shared with OSC_IN/OSC_OUT.
 |-
-| bgcolor="#FFFFFF" | PF1
+| bgcolor="#FFFFFF" | PC15
 | bgcolor="#FFFFFF" | D8
 | bgcolor="#FFFFFF" | CN3.11
-| bgcolor="#FFFFFF" align="center" | &harr;
+| bgcolor="#FFFFFF" align="center" | &rarr;
 | bgcolor="#FFFFFF" |
-*?
+*32.768KHz Xtal via SB7
 | bgcolor="#FFFFFF" |
 | bgcolor="#FFFFFF" | D7/D8 shared with OSC_IN/OSC_OUT.
 |}
+'''Note PA15 is the VCP RX, but is not broken out to a PCB pin.'''
+==Schematic==
+'''STM32L031K6 to ST-Link'''<br />
+[[File:STM32L031K6_nucleo_32_sch1.JPG|640px]]
+'''STM32L031K6, power, and breakout'''<br />
+[[File:STM32L031K6_nucleo_32_sch2.JPG|640px]]
+'''STM32F103CBT6 based ST-Link'''<br />
+[[File:STM32L031K6_nucleo_32_sch3.JPG|640px]]
 [[Category:Computing]]