Manufacturer: Silicon Laboratories Inc  •  Series: C8051F31x  •  Core Processor: 8051  •  Core Size: 8-Bit  •  Speed: 25MHz  •  Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART  •  Peripherals: POR, PWM, Temp Sensor, WDT  •  Number of I /O: 25  •  Program Memory Size: 16KB (16K x 8)  •  Program Memory Type: FLASH  •  RAM Size: 1.25K x 8  •  Voltage - Supply (Vcc/Vdd): 2.7 V ~ 3.6 V  •  Data Converters: A/D 17x10b  •  Oscillator Type: Internal  •  Operating Temperature: -40°C ~ 85°C  •  Package / Case: 28-QFN (28-MLP)  •  Other PartNo: 336-1057-1