The Maple

■Microcontroller: STM32 F103RB


■Clock Speed: 72 MHz

■Operating Voltage: 3.3V

■Input Voltage (recommended): 3.0V-12V

■Digital I/O Pins: 39

■Analog Input Pins: 16

■Flash Memory: 128 KB

■SRAM: 20KB

■64 Channel nested vector interrupt handler (including external interrupt on GPIO’s)

■Integrated SPI/I2C and 7 Channels of Direct Memory Access (DMA)

■Supplies up to 800mA @ 3.3v

■Support for low power and sleep modes (<500uA)

■Dimensions: 2.05″x2.1″
 
http://leaflabs.com/devices/maple/