Housed in a 100-LQFP package with a 14x14 mm body, the MSP430F47186IPZR uses a 0.50 mm pitch that demands a four-layer PCB for reliable fan-out of the 68 I/O. The exposed paddle on the bottom side is not present — thermal management relies on the leadframe and ambient airflow, so a solid ground plane under the package helps spread heat.
Memory and ADC headroom for metering
116 KB of flash and 8 KB of RAM give enough room for a polyphase metering stack plus a communication protocol handler. The six 16-bit sigma-delta ADCs sample simultaneously — each channel captures voltage and current at the same instant, which is the key requirement for accurate active and reactive power calculation in a three-phase system.