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| Part Number | EFM8BB31F32I-B-QFN32R | EFM8BB31F32I-C-QFN32R | EFM8BB31F32I-D-QFN32R | EFM8BB31F32I-B-QFP32R | EFM8BB31F32G-B-QFN32R | EFM8BB31F32I-B-5QFN32R | EFM8BB31F32I-B-QFN32 |
|---|---|---|---|---|---|---|---|
| Manufacturer | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Product Status | Not For New Designs | Not For New Designs | Active | Not For New Designs | Not For New Designs | Not For New Designs | Discontinued at Digi-Key |
| Core Processor | CIP-51 8051 | CIP-51 8051 | 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 | 8-Bit | 8-Bit |
| Speed | 50MHz | 50MHz | 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 | 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 | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT |
| Number of I/O | 29 | 29 | 29 | 28 | 29 | 29 | 29 |
| Program Memory Size | 32KB (32K x 8) | 32KB (32K x 8) | 32KB (32K x 8) | 32KB (32K x 8) | 32KB (32K x 8) | 32KB (32K x 8) | 32KB (32K x 8) |
| Program Memory Type | Flash | Flash | Flash | Flash | Flash | Flash | Flash |
| EEPROM Size | - | - | - | - | - | - | - |
| RAM Size | 2.25K x 8 | 2.25K x 8 | 2.25K x 8 | 2.25K x 8 | 2.25K x 8 | 2.25K x 8 | 2.25K 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 | 2.2V ~ 3.6V | 2.2V ~ 3.6V |
| Data Converters | A/D 20x10/12b SAR; D/A 2x12b | A/D 20x10/12b SAR; D/A 2x12b | A/D 20x12b; D/A 2x12b | A/D 20x10/12b SAR; D/A 2x12b | A/D 20x10/12b SAR; D/A 2x12b | A/D 20x10/12b SAR; D/A 2x12b | A/D 20x10/12b SAR; D/A 2x12b |
| Oscillator Type | Internal | Internal | Internal | Internal | Internal | Internal | Internal |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 32-UFQFN Exposed Pad | 32-UFQFN Exposed Pad | 32-UFQFN Exposed Pad | 32-TQFP | 32-UFQFN Exposed Pad | 32-WFQFN Exposed Pad | 32-UFQFN Exposed Pad |
| Supplier Device Package | 32-QFN (4x4) | 32-QFN (4x4) | 32-QFN (4x4) | 32-QFP (7x7) | 32-QFN (4x4) | 32-QFN (5x5) | 32-QFN (4x4) |
