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| PartNumber | EFM32WG940F256-QFN64 | EFM32WG940F128-QFN64T | EFM32WG940F128-QFN64 |
| Description | ARM Microcontrollers - MCU ARM Cortex-M4 48 MHz 256 kB USB LCD MCU | ARM Microcontrollers - MCU 128k Flash, 32k RAM, USB, 8x18 LCD, AES | ARM Microcontrollers - MCU ARM Cortex-M4 48 MHz 128 kB USB LCD MCU |
| Manufacturer | Silicon Laboratories | Silicon Laboratories | Silicon Laboratories |
| Product Category | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | QFN-64 | QFN-64 | QFN-64 |
| Series | EFM32WG | EFM32WG | EFM32WG |
| Core | ARM Cortex M4F | ARM Cortex M4 | ARM Cortex M4F |
| Data Bus Width | 32 bit | 32 bit | 32 bit |
| Maximum Clock Frequency | 48 MHz | 48 MHz | 48 MHz |
| Program Memory Size | 256 kB | 128 kB | 128 kB |
| Data RAM Size | 32 kB | 32 kB | 32 kB |
| ADC Resolution | 12 bit | 12 bit | 12 bit |
| Number of I/Os | 52 I/O | 52 I/O | 52 I/O |
| Operating Supply Voltage | 3 V | 1.98 V to 3.8 V | 3 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Packaging | Reel | Tray | Reel |
| Program Memory Type | Flash | Flash | Flash |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs |
| Data RAM Type | RAM | RAM | RAM |
| Interface Type | I2C, SPI, UART, USART, USB | I2C, SPI, UART, USART, USB | I2C, SPI, UART, USART, USB |
| I/O Voltage | 3 V | - | 3 V |
| Moisture Sensitive | Yes | Yes | Yes |
| Number of ADC Channels | 6 | 8 Channel | 6 |
| Number of Timers/Counters | 4 x 16 bit | 4 x 16 bit | 4 x 16 bit |
| Processor Series | EFM32WG940 | EFM32WG | EFM32WG940 |
| Product Type | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU |
| Factory Pack Quantity | 1000 | 260 | 1000 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Supply Voltage Max | 3.8 V | 3.8 V | 3.8 V |
| Supply Voltage Min | 1.98 V | 1.98 V | 1.98 V |
| Tradename | EFM32 | EFM32 | EFM32 |
| Part # Aliases | EFM32WG940F256 | - | EFM32WG940F128 |
| Unit Weight | 0.007277 oz | 0.007277 oz | 0.007277 oz |
| Product | - | MCU+DSP+FPU | - |
| Analog Supply Voltage | - | 3.8 V | - |
| DAC Resolution | - | 12 bit | - |
| Watchdog Timers | - | Watchdog Timer | - |