Texas Instruments Stellaris® ARM® Cortex®-M3S 6000 series LM3S6637-IQC50, 32-bit single-core MCU, 50 MHz, 128 KB Flash, 32K x 8 SRAM, Ethernet + I²C/SPI/UART, 41 I/O, 100-LQFP, -40°C to 85°C, 2.25V to 2.75V supply.
| Parameter | Value |
|---|---|
| Series | Stellaris® ARM® Cortex®-M3S 6000 |
| Mounting | Surface Mount |
| Oscillator type | Internal |
| Program memory type | FLASH |
| Voltage - supply (Vcc (Vdd)) | 2.25V ~ 2.75V |
| Operating temperature | -40°C~85°C(TA) |
| Speed | 50MHz |
| Package | Bulk |
| RAM size | 32K x 8 |
| Core size | 32-Bit Single-Core |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Connectivity | Ethernet, I²C, IrDA, Microwire, SPI, SSI, UART/USART |
| Number of i (O) | 41 |
| Core processor | ARM® Cortex®-M3 |
| Case | 100-LQFP |
| Data converters | A/D 4x10b |
| Program memory size | 128KB (128K x 8) |
The 50 MHz core, combined with the 128 KB Flash, gives enough headroom to run a lightweight TCP/IP stack (like lwIP) alongside application code, without needing an external Ethernet controller.
It needs a dedicated 2.5 V regulator — not a shared 3.3 V rail.
Housed in a 100-LQFP (14x14 mm) package, surface-mount.
Yes, it has an internal oscillator, so it can run without an external crystal for basic clocking. For precise Ethernet timing, an external oscillator or crystal is still recommended.