Green Pill

STM32L431C8T6


Board

NameGreen Pill
PartSTM32核心板 (Core board)
BrandUnknown
OriginChina

Microcontroller

PartSTM32L431C8T6
ManufacturerST-Microelectronics
CoreArm Cortex-M4
Max. Clock Speed80MHz
PackageLQFP 48 pins

Internal memories

FLASH256KiB
SRAM64KiB

Oscillators

HSI16MHz
LSI40kHz
HSE8MHz
LSE32.768kHz

Power

Sources
Any +3.3V pin (+3.3V)
Any +5V pin (+5V)
USB connector (+5V)
VDDA pinNo
VSSA pinNo
VREF- pinNo
VREF+ pinNo
Backup batteryPin

Regulator

ManufacturerShanghai TX Electronics Sci-Tech Co., Ltd
PartTX6211B (DE=A1D)
PackageSOT23-5 5 pins
Input+3.6V to +5.5V
Output+3.3V @ 300mA
DatasheetTX6211B.pdf

PCB

ColorGreen
Size (w x l)24mm x 60mm
MountingBreadboard and 4x mounting hole (M3)

Remarks

  • Warning: The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time.

Pictures

Green Pill: Perspective view
Green Pill: Perspective view
Green Pill: Top view
Green Pill: Top view
Green Pill: Bottom view
Green Pill: Bottom view

Inputs & outputs


Reset button

Name RESET
Reference -
Type Button
Connected to NRST
Mode Active low

BOOT0 jumper

Name B0
Reference -
Type 2-way jumper
Connected to BOOT0
Mode N.A.

BOOT1 jumper

Name B1
Reference -
Type 2-way jumper
Connected to PB2
Mode N.A.

Power LED

Name POW-LED
Reference LED3
Type LED
Connected to +3.3V rail
Mode N.A.

User LED

Name RUN-LED
Reference LED1
Type LED
Connected to PA0
Mode Sink

Connectors & headers


Header 1 properties

Name Unknown
Reference None
Type Pin header (2.54mm, 20x1, male)

Header 1 pins

# Name Function Connected to
1 VBAT - VBAT
2 PC13 - PC13
3 PC14 - PC14
4 PC15 - PC15
5 RST - RST
6 PA0 - PA0
7 PA1 - PA1
8 PA2 - PA2
9 PA3 - PA3
10 PA4 - PA4
11 PA5 - PA5
12 PA6 - PA6
13 PA7 - PA7
14 PB0 - PB0
15 PB1 - PB1
16 PB2 - PB2
17 PB10 - PB10
18 PB11 - PB11
19 GND - Ground plane
20 +5V - +5V rail

Header 2 properties

Name Unknown
Reference None
Type Pin header (2.54mm, 20x1, male)

Header 2 pins

# Name Function Connected to
1 GND - Ground plane
2 PB9 - PB9
3 PB8 - PB8
4 PB7 - PB7
5 PB6 - PB6
6 PB5 - PB5
7 PB4 - PB4
8 PB3 - PB3
9 PA15 - PA15
10 PA14 - PA14
11 PA13 - PA13
12 PA12 - PA12
13 PA11 - PA11
14 PA10 - PA10
15 PA9 - PA9
16 PA8 - PA8
17 PB15 - PB15
18 PB14 - PB14
19 PB13 - PB13
20 PB12 - PB12

USB connector properties

Name USB2.0
Reference USB2
Type USB Micro

USB connector pins

# Name Function Connected to
1 - VCC +5V rail
2 - D- PA11 via 22Ω (R7)
3 - D+ PA12 via 22Ω (R9)
4 - ID N.C.
5 - GND Ground plane

SWD header properties

Name Unknown
Reference J1
Type Pin header (2.54mm, 4x1, male)

SWD header pins

# Name Function Connected to
1 GND GND Ground plane
2 SWD SWDIO PA13
3 SWC SWCLK PA14
4 3V3 VCC +3.3V rail

Devices


24C02N properties

Name 24C02
Reference U3
Manufacturer Unknown
Part 24C02N
Marking 24C02N
Datasheet Unavailable
Package SOIC 8 pins
Description 256B I2C EEPROM

24C02N pins

# Name Function Connected to
1 - A0 Ground plane
2 - A1 Ground plane
3 - A2 Ground plane
4 - GND Ground plane
5 - SDA PB7 pulled up by 4.7kΩ resistor
6 - SCL PB6
7 - WP N.C.
8 - VCC +3.3V rail