Boring_TECH Black Pill
STM32L431CCT6
Board
| Name | Boring_TECH Black Pill |
| Part | Unknown |
| Brand | Boring_TECH |
| Origin | China |
Microcontroller
| Part | STM32L431CCT6 |
| Manufacturer | ST-Microelectronics |
| Core | Arm Cortex-M4 |
| Max. Clock Speed | 80MHz |
| Package | LQFP 48 pins |
Internal memories
| FLASH | 256KiB |
| SRAM | 64KiB |
Oscillators
| HSI | 16MHz |
| LSI | 32kHz |
| HSE | 8MHz |
| LSE | 32.768kHz |
Power
| Sources | Any +3.3V pin (+3.3V) Any +5V pin (+5V) USB connector (+5V) |
| VDDA pin | No |
| VSSA pin | No |
| VREF- pin | No |
| VREF+ pin | No |
| Backup battery | Pads |
Regulator
| Manufacturer | Unknown |
| Part | Unknown |
| Package | SOT23 3 pins |
| Input | +3.6V to +5.5V |
| Output | +3.3V @ 150mA |
| Datasheet | Unavailable |
PCB
| Color | Black |
| Size (w x l) | 25mm x 65mm |
| Mounting | 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
Resources
Connectors
Devices
Inputs & outputs
Reset button
| Name | RST |
| Reference | - |
| Type | Button |
| Connected to | NRST |
| Mode | Active low |
BOOT0 button
| Name | BOOT |
| Reference | - |
| Type | Button |
| Connected to | BOOT0 |
| Mode | Active high |
BOOT1 solder bridge
| Name | BOOT1 |
| Reference | 1 |
| Type | Solder bridge |
| Connected to | PB2 |
| Mode | Active high |
Power LED
| Name | LED(PWR) |
| Reference | - |
| Type | LED |
| Connected to | +3.3V rail |
| Mode | N.A. |
User LED 1 (Red)
| Name | - |
| Reference | - |
| Type | LED |
| Connected to | PA0 |
| Mode | Sink |
User LED 2 (Green)
| Name | - |
| Reference | - |
| Type | LED |
| Connected to | PA1 |
| Mode | Sink |
User LED 3 (Blue)
| Name | - |
| Reference | - |
| Type | LED |
| Connected to | PA2 |
| 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 | C13 | - | PC13 |
| 2 | B9 | - | PB9 |
| 3 | B8 | - | PB8 |
| 4 | B7 | - | PB7 |
| 5 | B6 | - | PB6 |
| 6 | B5 | - | PB5 |
| 7 | B4 | - | PB4 |
| 8 | B3 | - | PB3 |
| 9 | A15 | - | PA15 |
| 10 | A14 | - | PA14 |
| 11 | A13 | - | PA13 |
| 12 | A12 | - | PA12 |
| 13 | A11 | - | PA11 |
| 14 | A10 | - | PA10 |
| 15 | A9 | - | PA9 |
| 16 | A8 | - | PA8 |
| 17 | 5V | - | +5V rail |
| 18 | G | - | Ground plane |
| 19 | G | - | Ground plane |
| 20 | 3V3 | - | +3.3V rail |
Header 2 properties
| Name | Unknown |
| Reference | None |
| Type | Pin header (2.54mm, 20x1, male) |
Header 2 pins
| # | Name | Function | Connected to |
|---|---|---|---|
| 1 | A0 | - | PA0 |
| 2 | A1 | - | PA1 |
| 3 | A2 | - | PA2 |
| 4 | A3 | - | PA3 |
| 5 | A4 | - | PA4 |
| 6 | A5 | - | PA5 |
| 7 | A6 | - | PA6 |
| 8 | A7 | - | PA7 |
| 9 | B0 | - | PB0 |
| 10 | B1 | - | PB1 |
| 11 | B2 | - | PB2 |
| 12 | B10 | - | PB10 |
| 13 | B11 | - | PB11 |
| 14 | B12 | - | PB12 |
| 15 | B13 | - | PB13 |
| 16 | B14 | - | PB14 |
| 17 | B15 | - | PB15 |
| 18 | G | - | Ground plane |
| 19 | 5V | - | +5V rail |
| 20 | 3V3 | - | +3.3V rail |
USB connector properties
| Name | Unknown |
| Reference | None |
| Type | USB C |
USB connector pins
| # | Name | Function | Connected to |
|---|---|---|---|
| A1/B12 | - | GND | Ground plane |
| A4/B9 | - | VBUS | +5V rail |
| B8 | - | SBU2 | N.C. |
| A5 | - | CC1 | N.C. |
| B7 | - | D- | PA11 via 22Ω |
| A6 | - | D+ | PA12 via 22Ω |
| A7 | - | D- | PA11 via 22Ω |
| B6 | - | D+ | PA12 via 22Ω |
| A8 | - | SBU1 | N.C. |
| B5 | - | CC2 | N.C. |
| B4/A9 | - | VBUS | +5V rail |
| B1/A12 | - | GND | Ground plane |
SWD header properties
| Name | Unknown |
| Reference | None |
| Type | pin header (2.54mm, 4x2, male) |
SWD header pins
| # | Name | Function | Connected to |
|---|---|---|---|
| 1 | G | GND | Ground plane |
| 2 | C | SWCLK | PA14 |
| 3 | 5V | 5V | +5V rail |
| 4 | 3V3 | VCC | +3.3V rail |
| 5 | T | TX | PA9 |
| 6 | G | GND | Ground plane |
| 7 | R | RX | PA10 |
| 8 | D | SWDIO | PA13 |
Screen connector properties
| Name | Unknown |
| Reference | None |
| Type | FFC connector (0.5mm, 1x8, female) |
Screen connector pins
| # | Name | Function | Connected to |
|---|---|---|---|
| 1 | - | PWR | +3.3V rail via transistor |
| 2 | - | GND | Ground plane |
| 3 | - | RST | PB6 |
| 4 | - | DC | PB4 |
| 5 | - | SDA | PB5 |
| 6 | - | SCL | PB3 |
| 7 | - | VCC | +3.3V rail |
| 8 | - | GND | Ground plane |
Devices
Generic FLASH properties footprint
| Name | W25QXX |
| Reference | Unknown |
| Manufacturer | Unknown |
| Part | Generic FLASH |
| Marking | Unknown |
| Datasheet | Unavailable |
| Package | SOIC 8 pins |
| Description | Generic Dual/Quad SPI FLASH |
Generic FLASH pins footprint
| # | Name | Function | Connected to |
|---|---|---|---|
| 1 | - | /CS | PB12 |
| 2 | - | DO | PB14 |
| 3 | - | /WP | Ground plane |
| 4 | - | GND | Ground plane |
| 5 | - | DI | PB15 |
| 6 | - | CLK | PB13 |
| 7 | - | /HOLD | Ground plane |
| 8 | - | VCC | +3.3V rail |