Extended-temperature MSP430 in an 8-pin SOIC
The 8-SOIC package exposes 4 I/O lines, one I²C/SPI serial interface via the USI module, and a 4-channel 10-bit ADC — enough for a single sensor read, a PWM output, and a communication link in a compact control loop.
Memory and peripheral budget — what fits in 2 KB Flash
With 2 KB of Flash and 128 bytes of RAM, firmware must be lean. A typical application — reading a temperature sensor over I²C, logging a threshold crossing, and driving a PWM fan output — leaves about 600 bytes of Flash headroom after the MSP430 driver library and a minimal scheduler. The 128-byte RAM holds about 32 32-bit variables; any data logging or buffering beyond that needs external serial EEPROM or careful reuse of the register file. The internal oscillator trims to ±1% accuracy at 25°C, which is adequate for UART bit timing at 9600 baud without an external crystal.
Supply voltage and power budgeting
At 16 MHz active mode draws roughly 300 µA/MHz typical, so a 3.3 V rail feeding a 16 MHz loop pulls about 5 mA. The brown-out detect/reset (BOR) peripheral is included on-chip, eliminating an external supervisor IC in cost-sensitive designs. The 4 I/O pins are 5 V tolerant when configured as inputs, which simplifies level-shifting to legacy 5 V logic.