Blue Pill
STM32F103C8T6
Board
| Name | Blue Pill |
| Part | Unknown |
| Brand | Unknown |
| Origin | China |
Microcontroller
| Part | STM32F103C8T6 |
| Manufacturer | ST-Microelectronics |
| Core | Arm Cortex-M3 |
| Max. Clock Speed | 72MHz |
| Package | LQFP 48 pins |
Internal memories
| FLASH | 64KiB |
| SRAM | 20KiB |
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 | None |
Regulator
| Manufacturer | Shanghai TX Electronics Sci-Tech Co., Ltd |
| Part | TX6211B (DE=A1D) |
| Package | SOT23-5 5 pins |
| Input | +3.6V to +5.5V |
| Output | +3.3V @ 300mA |
| Datasheet | TX6211B.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.
- Warning: This board may have a wrong value of resistor on the USB D+ pin. Instead of a 1.5kΩ it has either a 10kΩ or 4.7kΩ resistor. This can be solved by replacing the resistor with the right value.
- Trivia: This board got its name from a forum post at the STM32duino forums and is a reference to the movie The Matrix.
Pictures
Inputs
Connectors
Devices
None
Inputs & outputs
Reset button
| Name | RESET |
| Reference | - |
| Type | Button |
| Connected to | NRST |
| Mode | Active low |
BOOT0 jumper
| Name | - |
| Reference | - |
| Type | 2-way jumper |
| Connected to | BOOT0 |
| Mode | N.A. |
BOOT1 jumper
| Name | - |
| Reference | - |
| Type | 2-way jumper |
| Connected to | PB2 |
| Mode | N.A. |
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 | R | - | NRST |
| 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 |
SWD header properties
| Name | SWD |
| Reference | None |
| Type | pin header (2.54mm, 4x1, male) |
SWD header pins
| # | Name | Function | Connected to |
|---|---|---|---|
| 1 | 3V3 | VCC | +3.3V rail |
| 2 | DIO | SWDIO | PA13 |
| 3 | CLK | SWCLK | PA14 |
| 4 | GND | GND | Ground plane |
USB connector properties
| Name | USB |
| Reference | None |
| Type | USB Micro |
USB connector pins
| # | Name | Function | Connected to |
|---|---|---|---|
| 1 | - | VCC | +5V rail |
| 2 | - | D- | PA11 |
| 3 | - | D+ | PA12 |
| 4 | - | ID | N.C. |
| 5 | - | GND | Ground plane |