The STM32F091RCH6 packs 256KB of Flash program memory and 32K x 8 of SRAM, with 52 general-purpose I/O lines. The peripheral set includes CANbus, multiple I²C and SPI interfaces, UART/USART with IrDA and LIN support, plus a 12-bit ADC with 19 channels and a 2-channel 12-bit DAC.
The supply range spans 2V to 3.6V, so it runs from a single 3.3V rail or a 2-cell Li-ion pack without a regulator.
Housed in a 64-UFBGA (5x5 mm) package, this is a fine-pitch BGA. The supplier device package is 64-UFBGA (5x5).