Six 24-bit sigma-delta converters on a 16-bit MCU
Its defining feature is the six 24-bit sigma-delta analog-to-digital converters, purpose-built for energy measurement, power monitoring, and precision sensor front ends where the ADC path dominates the BOM. The 256 KB of program Flash and 16K x 8 of RAM provide enough headroom for the metrology algorithms, calibration tables, and communication stacks without forcing an external memory. The 100-pin LQFP package brings out 62 I/O lines alongside the dedicated analog channels, so you can keep the signal chain on one die.
Active lifecycle — no end-of-life clock ticking
For a BOM line that sources a metrology-grade MCU, this avoids the scramble of a forced redesign mid-production.
What the 24-bit ADC array means for system architecture
Six independent 24-bit sigma-delta converters let you sample multiple voltage and current phases simultaneously — three-phase power metering with neutral sensing fits without external multiplexing. The 24-bit resolution delivers the dynamic range needed for Class 0.2 energy meters, where the effective number of bits at the line frequency determines the accuracy floor. The on-chip brown-out detect and POR circuits keep the ADC references stable during supply transients, which matters when the calibration constants live in Flash and a glitch corrupts the metrology baseline.