16-bit MCU with dual 24-bit sigma-delta ADC for precision measurement
The MSP430I2020TRHBT: Its defining feature is the pair of 24-bit sigma-delta analog-to-digital converters, making this part purpose-built for energy metering, flow sensing, weigh scales, and other low-frequency precision measurement applications where noise rejection and resolution matter more than raw throughput. Program memory is 16 KB of flash with 1 KB of SRAM, enough for a dedicated measurement algorithm and calibration constants without external storage.
Dual 24-bit sigma-delta ADC — the part's reason for being
The two 24-bit sigma-delta ADCs are the headline feature. They deliver the dynamic range needed for Class 0.5 energy metering or bridge-sensor readouts without an external AFE. The sigma-delta architecture inherently rejects mains-frequency noise, so a simple anti-alias filter suffices on the analog front end. Each converter can be synchronised to the same sample clock, enabling simultaneous sampling of voltage and current channels for power calculation.
16 KB of flash and 1 KB of SRAM place this MCU in the small-footprint tier. That is enough for a dedicated metrology stack, calibration tables, and a simple communication protocol, but leaves little room for a full RTOS or over-the-air update staging. Expect to compile the firmware for size and store constants in flash. The 1 KB RAM handles a few frames of ADC data and a command buffer; any large lookup table should live in flash.
At the low end, the internal oscillator and flash read path need no special warm-up; at 105°C, leakage on the sigma-delta inputs is the main concern — keep the source impedance below 10 kΩ.
32-VQFN package and board integration
The exposed pad is also the primary ground return for the analog section; keep the analog and digital ground planes joined under the pad to avoid ground loops.