The MSP430F5438A-ET is an ultralow-power microcontroller. The architecture, combined with extensive low-power modes, is optimized to achieve extended battery life in portable measurement applications. The device features a powerful 16-bit RISC CPU, 16-bit registers, and constant generators that contribute to maximum code efficiency. The digitally controlled oscillator (DCO) allows wake-up from low-power modes to active mode in 3.5 µs (typical). The MSP430F5438A-ET is a microcontroller configuration with three 16-bit timers, a high-performance 12-bit analog-to-digital converter (ADC), up to 4 universal serial communication interfaces (USCIs), a hardware multiplier, a DMA, a real-time clock (RTC) module with alarm capabilities, and up to 87 I/O pins. For complete module descriptions, see the MSP430F5xx and MSP430F6xx Family User’s Guide . Typical applications for this device include analog and digital sensor systems, digital motor control, remote controls, thermostats, digital timers, and hand-held meters.