MSP430F67791IPEU — 16-bit metering MCU with 7×24b sigma-delta ADC array
The distinguishing feature is the integrated 7-channel 24-bit sigma-delta ADC array plus a segment LCD driver — a peripheral set purpose-built for polyphase energy metering, precision instrumentation, and industrial sensor fusion.
Peripheral set: what the 7×24b sigma-delta converter means for the BOM
Seven independent 24-bit sigma-delta ADCs let this single MCU sample multiple voltage and current channels simultaneously — a three-phase energy meter needs at least six channels (three voltages, three currents). The seventh channel can cover neutral current or a reference. That integration eliminates external ADCs and their isolation, pulling the metrology section into one package. The LCD driver handles direct segment drive to a local display, cutting a separate display controller IC. Brown-out detect and POR are on-die, so the reset supervisor is also internal.
No AEC-Q grade is listed, so automotive under-hood use isn't the target.
128-LQFP package: footprint and routing
Housed in a 128-LQFP with a 20 mm × 14 mm body (supplier device package 128-LQFP 20x14). Surface-mount only, tray shipping. The 90 I/O lines on this fine-pitch quad flat pack demand careful fan-out on the PCB — expect at least four signal layers if most I/O are used.
Connectivity and debug
The MSP430 debug interface (Spy-Bi-Wire or JTAG) is standard; no special adapter needed beyond a common MSP430 FET. DMA offloads data movement from the CPU, useful when the sigma-delta converters run continuously.
No official second-source alternate is recorded, so sole-source risk should be assessed for high-volume builds.