Overview

IMPORTANT: A crowdfunded version of the MCU module (r2B4) can be found here.

STM32F7 MCU board for controlling up to 3 SPI peripheral modules, I2C fan controller, power soft-start/standby, TFT LCD with resistive touch controller, USB OTG, 10/100 Mbit/s Ethernet, SDRAM, EEPROM, rotary encoder, user switch, speaker and 2+2 digital I/O.

r3B3 prototype

Feature list

• STM32F769IIT6 32-bit ARM Cortex®-M7 MCU, 216 MHz, 2 MiB Flash, 512 KiB SRAM, LQFP176 package
• Digital I/O: 2 x buffered inputs and 2 x buffered outputs. Alternative functions: UART, 1 x PWM
• Rotary encoder with switch
• 1 x user switch (use as BOOT0 for firmware loader on power up)
• 3 x SPI channels (2 x Chip selects per channel), 40-pin IDC connector (DIB v1.0)
• Battery backup (CR2032 button cell type)
• AC frequency (50/60 Hz) RTC reference (optional)
• External supervisor with watchdog (optional)
• USB FS, OTG
• Micro SD card
• DP83848C Ethernet PHY (10/100 Mbit/s)
• 32 KiB I2C EEPROM
• SWG/JTAG connector (optional)
• 8 MiB SDRAM (e.g. IS42S16400J) upgradeable to 32 MiB
• 0.5 mm FFC 40-pin connector for 4.3" TFT LCD 480 x 272 px display
• TFT backlight brightness control
• Resistive touch controller (I2C)
• Soft-start/stand-by control lines for AUX PS board
• Small on-board speaker
• Input power: +5 V (+12 V pass-thru to peripheral modules)
• On board +3.3 V LDO
• Dimensions: 139.5 x 70 mm, 4-layer PCB
• CE certified design