Texas Instruments Stellaris® ARM® Cortex®-M3S 100 series LM3S102-EQN20-C2T, 32-Bit Single-Core MCU, 20MHz, 8KB Flash, 2K x 8 RAM, I²C/SPI/UART/USART, 48-LQFP, -40°C to 105°C.
| Parameter | Value |
|---|---|
| Series | Stellaris® ARM® Cortex®-M3S 100 |
| Mounting | Surface Mount |
| Oscillator type | Internal |
| Program memory type | FLASH |
| Voltage - supply (Vcc (Vdd)) | 3V ~ 3.6V |
| Operating temperature | -40°C~105°C(TA) |
| Speed | 20MHz |
| Package | Tape & Reel (TR) |
| RAM size | 2K x 8 |
| Core size | 32-Bit Single-Core |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Connectivity | I²C, Microwire, SPI, SSI, UART/USART |
| Number of i (O) | 18 |
| Core processor | ARM® Cortex®-M3 |
| Case | 48-LQFP |
| Program memory size | 8KB (8K x 8) |
It carries 2K x 8 of SRAM, enough for small protocol buffers and state machines.
The on-chip brown-out detect and POR circuits help maintain reset integrity across the temperature range.
This is a clean fit for new BOMs where long-term supply stability matters.
It supports I²C, Microwire, SPI, SSI, and UART/USART serial interfaces, covering the common buses for sensors, small displays, and serial EEPROMs.
Within the Stellaris ARM Cortex-M3S 100 series, higher-density siblings share the same 48-LQFP footprint and peripheral set but offer larger Flash and RAM options. Check the base product number LM3S102 for the specific memory tier you need — the package and pinout are consistent across the series.