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| PartNumber | EFM32LG840F256G-E-QFN64 | EFM32LG840F256-QFN64 | EFM32LG840F256-QFN64T |
| Description | ARM Microcontrollers - MCU 256k Flash, 32k RAM, 8x20 LCD, AES | ARM Microcontrollers - MCU 256k Flash, 32k RAM, 8x20 LCD, AES | Microcontrollers - MCU ARM Microcontrollers - MCU 256k Flash 32k RAM 8x20 LCD AES |
| Manufacturer | Silicon Laboratories | Silicon Laboratories | Silicon Labs |
| Product Category | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU | Embedded - Microcontrollers |
| RoHS | Y | Y | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | QFN-64 | QFN-64 | - |
| Series | EFM32LG | EFM32LG | Leopard Gecko |
| Core | ARM Cortex M3 | ARM Cortex M4 | - |
| Data Bus Width | 32 bit | 32 bit | - |
| Maximum Clock Frequency | 48 MHz | 48 MHz | - |
| Program Memory Size | 64 kB | 256 kB | 256KB (256K x 8) |
| Data RAM Size | 32 kB | 32 kB | - |
| ADC Resolution | 12 bit | 12 bit | - |
| Number of I/Os | 56 I/O | 56 I/O | - |
| Operating Supply Voltage | 2 V to 3.8 V | 3 V | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 85 C | + 85 C | - |
| Packaging | Tray | Tray | Tray |
| Product | MCU | - | - |
| Program Memory Type | Flash | Flash | FLASH |
| Brand | Silicon Labs | Silicon Labs | - |
| Data RAM Type | RAM | SRAM | - |
| Data ROM Size | 256 kB | - | - |
| Data ROM Type | Flash | - | - |
| Interface Type | I2C, SPI, UART, USB | I2C, SPI, UART | - |
| Moisture Sensitive | Yes | Yes | - |
| Number of Timers/Counters | 5 Timer | 4 Timer | - |
| Processor Series | EFM32 | EFM32 | - |
| Product Type | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU | - |
| Factory Pack Quantity | 260 | 1000 | - |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | - |
| Tradename | EFM32 | EFM32 | - |
| Unit Weight | 0.007277 oz | 0.007277 oz | - |
| Height | - | 1.2 mm | - |
| Length | - | 12 mm | - |
| Width | - | 12 mm | - |
| I/O Voltage | - | 3 V | - |
| Supply Voltage Max | - | 3.8 V | - |
| Supply Voltage Min | - | 1.98 V | - |
| Part # Aliases | - | EFM32LG840F256 | - |
| Package Case | - | - | 64-WFQFN Exposed Pad |
| Operating Temperature | - | - | -40°C ~ 85°C (TA) |
| Supplier Device Package | - | - | * |
| Number of I O | - | - | 56 |
| Speed | - | - | 48MHz |
| EEPROM Size | - | - | - |
| Core Processor | - | - | |
| RAM Size | - | - | 32K x 8 |
| Peripherals | - | - | Brown-out Detect/Reset, DMA, LCD, POR, PWM, WDT |
| Connectivity | - | - | I2C, IrDA, SmartCard, SPI, UART/USART |
| Voltage Supply Vcc Vdd | - | - | 1.85 V ~ 3.8 V |
| Core Size | - | - | 32-Bit |
| Data Converters | - | - | A/D 8x12b, D/A 2x12b |
| Oscillator Type | - | - | Internal |