Blue Pill
STM32F051C8T6
Board
| Name | Blue Pill |
| Part | Unknown |
| Brand | Unknown |
| Origin | China |
Microcontroller
| Part | STM32F051C8T6 |
| Manufacturer | ST-Microelectronics |
| Core | Arm Cortex-M0 |
| Max. Clock Speed | 48MHz |
| Package | LQFP 48 pins |
Internal memories
| FLASH | 64KiB |
| SRAM | 8KiB |
Oscillators
| HSI | 8MHz |
| LSI | 40kHz |
| 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 | Pin |
Regulator
| Manufacturer | Torex Semiconductor LTD. |
| Part | XC6204 (4A2D / 4B2X) |
| Package | SOT89-3 3 pins |
| Input | +3.6V to +10V |
| Output | +3.3V @ 300mA |
| Datasheet | XC6204-XC6205.pdf |
PCB
| Color | Blue |
| Size (w x l) | 23mm x 53mm |
| Mounting | Breadboard |
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
Inputs
Connectors
Devices
Inputs & outputs
Reset button
| Name | REST |
| Reference | - |
| Type | Button |
| Connected to | NRST |
| Mode | Active low |
BOOT0 jumper
| Name | BOOT0 |
| Reference | - |
| Type | 1-way jumper |
| Connected to | BOOT0 |
| Mode | Active low |
Power LED
| Name | PWR |
| Reference | - |
| Type | LED |
| Connected to | +3.3V rail |
| Mode | N.A. |
User LED
| Name | PC13 |
| Reference | - |
| Type | LED |
| Connected to | PC13 |
| 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 | VB | - | VBAT |
| 2 | C13 | - | PC13 |
| 3 | C14 | - | PC14 |
| 4 | C15 | - | PC15 |
| 5 | A0 | - | PA0 |
| 6 | A1 | - | PA1 |
| 7 | A2 | - | PA2 |
| 8 | A3 | - | PA3 |
| 9 | A4 | - | PA4 |
| 10 | A5 | - | PA5 |
| 11 | A6 | - | PA6 |
| 12 | A7 | - | PA7 |
| 13 | B0 | - | PB0 |
| 14 | B1 | - | PB1 |
| 15 | B10 | - | PB10 |
| 16 | B11 | - | PB11 |
| 17 | B2 | - | PB2 |
| 18 | 3.3 | - | +3.3V rail |
| 19 | G | - | Ground plane |
| 20 | G | - | Ground plane |
Header 2 properties
| Name | Unknown |
| Reference | None |
| Type | Pin header (2.54mm, 20x1, male) |
Header 2 pins
| # | Name | Function | Connected to |
|---|---|---|---|
| 1 | 3.3 | - | +3.3V rail |
| 2 | G | - | Ground plane |
| 3 | 5V | - | +5V rail |
| 4 | B9 | - | PB9 |
| 5 | B8 | - | PB8 |
| 6 | B7 | - | PB7 |
| 7 | B6 | - | PB6 |
| 8 | B5 | - | PB5 |
| 9 | B4 | - | PB4 |
| 10 | B3 | - | PB3 |
| 11 | A15 | - | PA15 |
| 12 | A12 | - | PA12 |
| 13 | A11 | - | PA11 |
| 14 | A10 | - | PA10 |
| 15 | A9 | - | PA9 |
| 16 | A8 | - | PA8 |
| 17 | B15 | - | PB15 |
| 18 | B14 | - | PB14 |
| 19 | B13 | - | PB13 |
| 20 | B12 | - | PB12 |
USB connector properties
| Name | Unknown |
| Reference | None |
| Type | USB Mini |
USB connector pins
| # | Name | Function | Connected to |
|---|---|---|---|
| 1 | - | VCC | +5V rail |
| 2 | - | D- | N.C. |
| 3 | - | D+ | N.C. |
| 4 | - | ID | N.C. |
| 5 | - | GND | Ground plane |
SWD header properties
| Name | Unknown |
| Reference | None |
| Type | Pin header (2.54mm, 4x1, male) |
SWD header pins
| # | Name | Function | Connected to |
|---|---|---|---|
| 1 | 3.3V | VCC | +3.3V rail |
| 2 | DIO | SWDIO | PA13 |
| 3 | CLK | SWCLK | PA14 |
| 4 | GND | GND | Ground plane |
Devices
Generic EEPROM properties footprint
| Name | Unknown |
| Reference | U3 |
| Manufacturer | Unknown |
| Part | Generic EEPROM |
| Marking | Unknown |
| Datasheet | Unavailable |
| Package | SOP 8 pins |
| Description | Generic I2C EEPROM |
Generic EEPROM pins footprint
| # | Name | Function | Connected to |
|---|---|---|---|
| 1 | - | A0 | Ground plane |
| 2 | - | A1 | Ground plane |
| 3 | - | A2 | Ground plane |
| 4 | - | GND | Ground plane |
| 5 | - | SDA | PF7 |
| 6 | - | SCL | PF6 |
| 7 | - | WP | Ground plane |
| 8 | - | VCC | +3.3V rail |