JMCU Nucleo-F103RB devboard

Development Board Power

The board can be powered from STM32 Nucleo or from terminal 8-56V. To select a power source, you must install the appropriate jumper PWR SOURCE 5V.

The ground is shared between the debug board and the Nucleo board. The 3.3V supply voltage is generated from a 5V source using a linear regulator (LDO) installed on the Nucleo board. When installing a large number of JXM modules, it is recommended to use only an external 8 power supply.

Buttons and indication

To control the boot mode of the microcontroller, the "BOOT0" button is used, which controls the BOOT0 pin of the microcontroller: while holding down the "BOOT0" button during power-up or hardware reset of the microcontroller, the built-in STM32 bootloader is loaded, which allows you to write firmware via UART or I2C. When pressed, a high logic level is set at the BOOT0 input of the microcontroller.

There is a red LED JXM_RESET - a signal to reset the JXM modules. Each JXM module has a green LED JXM_INT - interrupt indicator.

All other indicators are available on the STM32 Nucleo board.

RESET

Hardware reset of the microcontroller is carried out from the button on the STM32 Nucleo debug board.

EEPROM and FRAM

Addresses of memory chips on the I2C bus:

EEPROM CAT24C64 64Kbit address 7-bit 0x57

FRAM FM24CL64B 64Kbit address 7-bit 0x56

This I2C bus also has a pin connector for connecting additional devices.

JXM module pinout 8-pin connector

JXM module pinout 4-pin connector

STM32F103RB pin assignment