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| PartNumber | EFM32LG840F128G-E-QFN64 | EFM32LG840F128-QFN64 | EFM32LG840F128-QFN64T |
| Description | ARM Microcontrollers - MCU 128k Flash, 32k RAM, 8x20 LCD, AES | ARM Microcontrollers - MCU 128k Flash, 32k RAM, 8x20 LCD, AES | ARM Microcontrollers - MCU 128k Flash, 32k RAM, 8x20 LCD, AES |
| 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 | EFM32LG | EFM32LG | EFM32LG |
| Core | ARM Cortex M3 | ARM Cortex M3 | - |
| Data Bus Width | 32 bit | 32 bit | - |
| Maximum Clock Frequency | 48 MHz | - | - |
| Program Memory Size | 64 kB | - | - |
| Data RAM Size | 32 kB | - | - |
| ADC Resolution | 12 bit | - | - |
| Number of I/Os | 56 I/O | - | - |
| Operating Supply Voltage | 2 V to 3.8 V | - | - |
| Minimum Operating Temperature | - 40 C | - | - |
| Maximum Operating Temperature | + 85 C | - | - |
| Packaging | Tray | Tray | Reel |
| Product | MCU | - | - |
| Program Memory Type | Flash | - | - |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs |
| Data RAM Type | RAM | - | - |
| Data ROM Size | 128 kB | - | - |
| Data ROM Type | Flash | - | - |
| Interface Type | I2C, SPI, UART, USB | - | - |
| Moisture Sensitive | Yes | Yes | Yes |
| Number of Timers/Counters | 5 Timer | - | - |
| Processor Series | EFM32 | - | - |
| Product Type | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU |
| Factory Pack Quantity | 260 | 1000 | 260 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Tradename | EFM32 | EFM32 | EFM32 |
| Unit Weight | 0.007277 oz | 0.007277 oz | 0.007277 oz |
| Part # Aliases | - | EFM32LG840F128 | - |