Overview

Open405R-C is an STM32 development board designed for the STM32F405RGT6 microcontroller, consists of the mother board and the MCU core board Core405R.

The Open405R-C supports further expansion with various optional accessory boards for specific application. The modular and open design makes it the ideal for starting application development with STM32F2 series microcontrollers.

What's on the mother board

1. MCU core board connector: for easily connecting the Core405R
2. UART3 interface: easily connects to RS232, USB TO 232, etc.
3. SDIO interface: for connecting Micro SD module, features much faster access speed rather than SPI
4. I2S2/I2S3/I2C1: for connecting I2S peripherals, such as Audio module
5. I2C1/I2C2 interface: easily connects to I2C peripherals such as I/O expander (PCF8574), FRAM (FM24CLxx), etc.
6. SPI1/SPI2 + AD/DA interface
   • easily connects to SPI peripherals such as DataFlash (AT45DBxx), SD card, MP3 module, etc.
   • SPI1 features AD/DA alternative function, supports connecting AD/DA module as well
7. USART2 interface: easily connects to RS232, RS485, USB TO 232, etc.
8. LCD interface: for connecting touch screen LCD
9. ULPI interface: for connecting high-speed USB peripheral (the STM32F405R integrates USB HS controller without any PHY device)
10. UART1 interface: easily connects to RS232, USB TO 232, etc.
11. CAN2 interface: communicates with accessory boards which feature the CAN device conveniently
12. CAN1 interface: communicates with accessory boards which feature the CAN device conveniently
13. ONE-WIRE interface: easily connects to ONE-WIRE devices (TO-92 package), such as temperature sensor (DS18B20), electronic registration number (DS2401), etc.
14. 5V DC jack
15. 5V/3.3 V power input/output: usually used as power output, also common-grounding with other user board
16. MCU pins connector: VCC, GND, and all the I/O ports are accessible on expansion connectors for further expansion
17. LEDs jumper
    • short the jumper to connect to default I/Os used in example code
    • open the jumper to connect to custom I/Os via jumper wires
18. Joystick jumper
    • short the jumper to connect to default I/Os used in example code
    • open the jumper to connect to custom I/Os via jumper wires
19. User key/Wake-Up button jumper
    • short the jumper to connect to default I/Os used in example code
    • open the jumper to connect to custom I/Os via jumper wires
20. 5V power selection jumper: powered from Core 5V or 5V DC
21. LEDs: convenient for indicating I/O status and/or program running state
22. User key: convenient for I/O input and/or interact with running code
23. Wake-Up button: wake up the STM32 MCU from sleep mode, also used as regular user key
24. Joystick: convenient for I/O input (five positions)

What's on the Core405R

1. STM32F405RGT6:the high performance STM32 MCU which features:
   • Core: Cortex-M4 32-bit RISC
   • Operating Frequency: 168MHz, 210 DMIPS/1.25 DMIPS/MHz
   • Operating Voltage: 1.8V-3.6V
   • Package: LQFP64
   • Memories: 1MB Flash, 192+4kB SRAM
   • MCU communication Interfaces:
     • 3 x SPI, 4 x USART, 2 x UART, 2 x I2S, 3 x I2C, 1 x SDIO, 2 x CAN
     • 1 x USB 2.0 HS/FS device/host/OTG controller with dedicated DMA, on-chip full-speed PHY
     • 1 x USB HS ULPI (external PHY required)
   • AD & DA converters: 3 x AD (12-bit, 1μs, shares 16 channels); 2 x DA (12-bit)
   • Debugging/Programming: supports JTAG/SWD (serial wire debug) interfaces, supports IAP
2. AMS1117-3.3: 3.3V voltage regulator
3. MIC2075-2: onboard USB power management device
4. Power supply switch, powered from 5Vin or USB connection
5. Boot mode selection, for configuring BOOT0 pin
6. Power indicator
7. VBUS LED
8. Reset button
9. 8M crystal
10. 32.768K crystal, for internal RTC with calibration
11. JTAG/SWD interface: for debugging/programming
12. USB connector, used for establishing USB communication between PC and the STM32 development board
13. MCU pins expander, VCC, GND and all the I/O pins are accessible on expansion connectors for further expansion
14. 5Vin pinheader, 5V power supply is required when using USB HOST/OTG
15. USB jumper
    • short the jumper when using USB
    • open the jumper to disconnect from related I/O port
16. VBAT selection jumper
    • short the jumper to use system power supply
    • open the jumper to connect the VBAT to external power, such as battery

Photos

Open405R-C development board

Open405R-C development board

Open405R-C development board back view

Open405R-C mother board

MCU core board Core405R

MCU core board Core405R

Connecting to touch screen LCD

Connecting to USB device through OTG cable

Connecting to USB3300 USB HS Board

Connecting to audio Board

Connecting to RS232 Board

Connecting to RS485 Board

Connecting to USB UART Board

Connecting to CAN Board

Connecting to 8 Push Buttons

Connecting to 5 IO Keypad

Connecting to AD Keypad

Test Board on the AD/DA port

Connecting to FRAM Board

Multi I2C peripheral Module connected to the I2C bus

Connecting to DataFlash Board

Connecting to VS1003B MP3 Board

Connecting to NRF24L01 RF Board

Connecting to Micro SD Storage Board

Connecting to any accessory board you need

Note:
The Open405R-C supports programming via STM32 UART bootloader, a USB TO UART accessory board is also provided in the package.
The Open405R-C does NOT integrate any debugging function, a debugger is required.

JTAG/SWD interfaces

The figure 1, and 2 show the header pinouts of JTAG/SWD interface

Figure 1. JTAG Header Pinout

Figure 2. SWD Header Pinout

Development Resources

• Related software (KEIL etc.)
• Demo code (examples in C, μC/OS-II)
• Schematic (PDF)
• STM32 development documentations (Datasheet etc.)

Wiki: www.waveshare.com/wiki/Open405R-C

1. Open405R-C development board x 1
2. PL2303 USB UART Board (mini) V2 x 1
3. USB type A plug to mini-B plug cable x 1
4. USB type A receptacle to mini-B plug cable x 1
5. 4-pin 2-pin wires pack x 1
6. USB power cable x 1