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| Part Number | EFM8BB31F64G-A-QFP32R | EFM8BB31F64G-C-QFP32R | EFM8BB31F64G-B-QFP32R | EFM8BB31F64G-A-QFN32R | EFM8BB31F64G-A-QFP32 | 
|---|---|---|---|---|---|
| Manufacturer | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | 
| Product Status | Discontinued at Digi-Key | Not For New Designs | Discontinued at Digi-Key | Discontinued at Digi-Key | Discontinued at Digi-Key | 
| Core Processor | CIP-51 8051 | CIP-51 8051 | CIP-51 8051 | CIP-51 8051 | CIP-51 8051 | 
| Core Size | 8-Bit | 8-Bit | 8-Bit | 8-Bit | 8-Bit | 
| Speed | 50MHz | 50MHz | 50MHz | 50MHz | 50MHz | 
| Connectivity | I²C, SMBus, SPI, UART/USART | I²C, SMBus, SPI, UART/USART | I²C, SMBus, SPI, UART/USART | I²C, SMBus, SPI, UART/USART | I²C, SMBus, SPI, UART/USART | 
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT | 
| Number of I/O | 28 | 28 | 28 | 29 | 28 | 
| Program Memory Size | 64KB (64K x 8) | 64KB (64K x 8) | 64KB (64K x 8) | 64KB (64K x 8) | 64KB (64K x 8) | 
| Program Memory Type | Flash | Flash | Flash | Flash | Flash | 
| EEPROM Size | - | - | - | - | - | 
| RAM Size | 4.25K x 8 | 4.25K x 8 | 4.25K x 8 | 4.25K x 8 | 4.25K x 8 | 
| Voltage - Supply (Vcc/Vdd) | 2.2V ~ 3.6V | 2.2V ~ 3.6V | 2.2V ~ 3.6V | 2.2V ~ 3.6V | 2.2V ~ 3.6V | 
| Data Converters | A/D 20x10/12b SAR; D/A 4x12b | A/D 20x10/12b SAR; D/A 4x12b | A/D 20x10/12b SAR; D/A 4x12b | A/D 20x10/12b SAR; D/A 4x12b | A/D 20x10/12b SAR; D/A 4x12b | 
| Oscillator Type | Internal | Internal | Internal | Internal | Internal | 
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | 
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | 
| Package / Case | 32-TQFP | 32-TQFP | 32-TQFP | 32-UFQFN Exposed Pad | 32-TQFP | 
| Supplier Device Package | 32-QFP (7x7) | 32-QFP (7x7) | 32-QFP (7x7) | 32-QFN (4x4) | 32-QFP (7x7) |