Energy-metering silicon with four 24-bit sigma-delta ADCs
What sets this part apart from the general-purpose MSP430 lineup is the integrated four-channel 24-bit sigma-delta analog-to-digital converter — a front-end purpose-designed for polyphase energy metering, power-quality monitoring, and precision industrial measurement. On the connectivity side it carries I²C, SPI, UART/USART, LINbus, and IrDA interfaces, plus 62 general-purpose I/O lines.
The sigma-delta ADC — why this chip exists
The four 24-bit sigma-delta converters are the reason TI built this variant. They are not general-purpose SAR converters bolted on as an afterthought; the modulator architecture and digital filter are tuned for 50/60 Hz line-cycle synchronous sampling, harmonic analysis, and active/reactive energy accumulation. For a design engineer sizing a three-phase meter or a submetering node, the 4x24b SD ADC means you can digitize voltage and current from all three phases plus neutral in one chip, without an external analog front-end. The 8x10-bit auxiliary ADC handles the less demanding housekeeping measurements — temperature, DC bus voltage, tamper detection.
Internal oscillator is available, but for revenue-grade accuracy you will clock it from an external crystal and let the FLL lock to the line frequency.
Package and footprint reality
Housed in a 100-pin LQFP with a 14x14 mm body (supplier device package 100-LQFP 14x14). Surface-mount only. The 0.5 mm pitch and exposed pad demand a decent solder stencil aperture and a reflow profile that hits the datasheet's peak temperature window — MSL level is not listed here, but standard LQFP practice is MSL 3, so bake before reflow if the moisture-barrier bag has been breached. No thermal pad on this package; the 100-LQFP dissipates through the leads and the board copper.
Active lifecycle — no LTB concern
TI lists the MSP430F67481IPZ as Active. For a BOM cost engineer or supply-chain planner, this removes the single-source risk that haunts older MSP430 derivatives. The base product number is MSP430F67481, so any future die shrinks or package changes will carry a suffix revision, not a sudden obsoletion. If you need a second-source conversation, there is no pin-compatible drop-in from another vendor — the sigma-delta ADC peripheral is TI-specific — but within the MSP430F6xx family, density and peripheral variants share the same LQFP-100 footprint.