| Base Product Number | EFM8BB21 |
| Category | Integrated Circuits (ICs) |
| Connectivity | I?C, SMBus, SPI, UART/USART |
| Core Processor | CIP-51 8051 |
| Core Size | 8-Bit |
| Data Converters | A/D 20x12b |
| EEPROM Size | - |
| Mfr | Silicon Labs |
| Mounting Type | Surface Mount |
| Number of I/O | In Stock |
| Operating Temperature | -40?C ~ 125?C (TA) |
| Oscillator Type | Internal |
| Package | Tape & Reel (TR) |
| Package / Case | 24-SSOP (0.154", 3.90mm Width) |
| Part Status | Active |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Program Memory Size | 16KB (16K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 2.25K x 8 |
| Series | Busy Bee |
| Speed | 50MHz |
| Supplier Device Package | 24-QSOP |
| Voltage - Supply (Vcc/Vdd) | 2.2V ~ 3.6V |