The SiM3U156-B-GMR is an embedded microcontroller IC from Silicon Labs' SiM3U1xx series.

• Core Processor: ARM Cortex-M3
• Processing Speed: 80MHz
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• RAM Size: 32K x 8
• Data converters: A/D 28x12b and D/A 2x10b
• I/Os: 50
• Connectivity: EBI/EMI, I2C, IrDA, SmartCard, SPI, UART/USART, and USB
• Peripherals: brown-out detect/reset, DMA, I2S, POR, PWM, and WDT
• Package: 64-VFQFN Exposed Pad
• Supplier device package: 64-QFN (9x9)
• Operating Temperature Range (TA): -40°C to 85°C
• Supply Voltage Range: 1.8V to 3.6V
• Comment: The SiM3U156-B-GMR is perfect for use in applications that require high processing speed and connectivity options.