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| Part Number | EFM8UB31F40G-A-QSOP24 | EFM8UB31F40G-A-QSOP24R | 
|---|---|---|
| Manufacturer | Silicon Labs | Silicon Labs | 
| Product Status | Obsolete | Obsolete | 
| Core Processor | CIP-51 8051 | CIP-51 8051 | 
| Core Size | 8-Bit | 8-Bit | 
| Speed | 48MHz | 48MHz | 
| Connectivity | I²C, SMBus, SPI, UART/USART, USB | I²C, SMBus, SPI, UART/USART, USB | 
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT | 
| Number of I/O | 17 | 17 | 
| Program Memory Size | 40KB (40K x 8) | 40KB (40K x 8) | 
| Program Memory Type | Flash | Flash | 
| EEPROM Size | - | - | 
| RAM Size | 3.25K x 8 | 3.25K x 8 | 
| Voltage - Supply (Vcc/Vdd) | 1.71V ~ 5.5V | 1.71V ~ 5.5V | 
| Data Converters | A/D 16x12b | A/D 16x12b | 
| Oscillator Type | Internal | Internal | 
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | 
| Mounting Type | Surface Mount | Surface Mount | 
| Package / Case | 24-SSOP (0.154", 3.90mm Width) | 24-SSOP (0.154", 3.90mm Width) | 
| Supplier Device Package | 24-QSOP | 24-QSOP |