| Model Number |
| EFM8SB20F64G-B-QFN32 |
EFM8UB31F40G-A-QSOP24 |
| Model Name |
| SKYWORKS/SILICON LABS EFM8SB20F64G-B-QFN32 |
SKYWORKS/SILICON LABS EFM8UB31F40G-A-QSOP24 |
| Category |
| Microcontroller Units (MCUs/MPUs/SOCs) |
Microcontroller Units (MCUs/MPUs/SOCs) |
| Brand |
| SKYWORKS/SILICON LABS |
SKYWORKS/SILICON LABS |
| Description |
| 64KB 1.8V~3.6V 51Series 25MHz FLASH 24 QFN-32-EP(5x5) Microcontroller Units (MCUs/MPUs/SOCs) ROHS |
40KB 1.71V~5.5V 51Series 48MHz 17 SSOP-24-150mil Microcontroller Units (MCUs/MPUs/SOCs) ROHS |
| RoHS |
| Lead free / RoHS Compliant |
Lead free / RoHS Compliant |
| Unit |
| Piece |
Piece |
| Weight: |
| 0.001 grams / 0.000035 oz |
1.000 grams / 0.035274 oz |
| Package / Case |
| QFN-32-EP(5x5) |
SSOP-24-150mil |
| Package / Arrange |
| Tube-packed |
Tube-packed |
| Battery |
| No |
No |
| ECCN |
| 3A991A2 |
3A991A2 |
| Infrared Data Association |
| - |
N/A |
| Low-Voltage Detect |
| Yes |
Yes |
| CCP Capture/Compare |
| - |
N/A |
| Program Storage Size |
| 64KB |
40KB |
| Internal Comparator |
| - |
N/A |
| communication protocol |
| - |
N/A |
| Operating Voltage Range |
| 1.8V~3.6V |
1.71V~5.5V |
| Operating Temperature Range |
| -40℃~+85℃ |
-40℃~+85℃ |
| Watchdog |
| Yes |
Yes |
| CPU Core |
| 51Series |
51Series |
| Peripheral/Function |
| PWM;WDT |
N/A |
| Real-Time Clock |
| - |
N/A |
| Secure Digital Input and Output |
| - |
N/A |
| Universal Serial Bus |
| - |
Yes |
| Direct Memory Access |
| - |
N/A |
| PWM (Bit) |
| - |
N/A |
| Internal Oscillator |
| Yes |
Yes |
| CPU Maximum Speed |
| 25MHz |
48MHz |
| DAC (Bit) |
| - |
N/A |
| Program Memory Type |
| FLASH |
N/A |
| ADC (Bit) |
| 10bit |
12bit |
| GPIO Ports Number |
| 24 |
17 |
