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| PartNumber | EFM8BB31F32I-B-4QFN24 | EFM8BB31F32I-B-5QFN32 | EFM8BB31F32I-B-4QFN24R |
| Description | 8-bit Microcontrollers - MCU 8051 50 MHz 32 kB flash 2.25 kB RAM 8-bit Busy Bee MCU | 8-bit Microcontrollers - MCU 8051 50 MHz 32 kB flash 2.25 kB RAM 8-bit Busy Bee MCU | IC MCU 8BIT 32KB FLASH 24QFN |
| Manufacturer | Silicon Laboratories | Silicon Laboratories | - |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| RoHS | Y | Y | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | QFN-24 | QFN-32 | - |
| Series | EFM8BB3 | EFM8BB3 | - |
| Core | CIP-51 8051 | CIP-51 8051 | - |
| Data Bus Width | 8 bit | 8 bit | - |
| Maximum Clock Frequency | 50 MHz | 50 MHz | - |
| Program Memory Size | 32 kB | 32 kB | - |
| Data RAM Size | 2.25 kB | 2.25 kB | - |
| ADC Resolution | 10 bit, 12 bit | 10 bit, 12 bit | - |
| Number of I/Os | 20 I/O | 29 I/O | - |
| Operating Supply Voltage | 2.2 V to 3.6 V | 2.2 V to 3.6 V | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 125 C | + 125 C | - |
| Product | MCU | MCU | - |
| Program Memory Type | Flash | Flash | - |
| Brand | Silicon Labs | Silicon Labs | - |
| Data RAM Type | RAM | RAM | - |
| Interface Type | I2C, SMBus, SPI, UART | I2C, SMBus, SPI, UART | - |
| DAC Resolution | 12 bit | 12 bit | - |
| I/O Voltage | 2.2 V to 3.6 V | 2.2 V to 3.6 V | - |
| Moisture Sensitive | Yes | Yes | - |
| Number of ADC Channels | 12 Channel | 20 Channel | - |
| Number of Timers/Counters | 6 Timer | 6 Timer | - |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| Factory Pack Quantity | 91 | 73 | - |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | - |
| Supply Voltage Max | 3.6 V | 3.6 V | - |
| Supply Voltage Min | 2.2 V | 2.2 V | - |
| Tradename | Busy Bee | Busy Bee | - |
| Watchdog Timers | Watchdog Timer | Watchdog Timer | - |