| Core Processor | CIP-51 8051 | |
| DigiKey Programmable | Not Verified | |
| Program Memory Type | FLASH | |
| Product Status | Active | |
| Supplier Device Package | 24-QSOP | |
| EEPROM Size | - | |
| Package / Case | 24-SSOP (0.154", 3.90mm Width) | |
| Mfr | Silicon Labs | |
| Voltage - Supply (Vcc/Vdd) | 2.2V ~ 3.6V | |
| RoHS Status | RoHS Compliant | |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) | |
| Speed | 50MHz | |
| Operating Temperature | -40°C ~ 125°C (TA) | |
| RAM Size | 2.25K x 8 | |
| ECCN | 3A991A2 | |
| Number of I/O | 21 | |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT | |
| Mounting Type | Surface Mount | |
| Oscillator Type | Internal | |
| Series | Busy Bee | |
| Core Size | 8-Bit | |
| Connectivity | I2C, SMBus, SPI, UART/USART | |
| Program Memory Size | 16KB (16K x 8) | |
| HTSUS | 8542.31.0001 | |
| Package | Tape & Reel (TR) | |
| Data Converters | A/D 20x12b | |
| Base Product Number | EFM8BB21 | |
