Isolated shunt current + voltage measurement for motor drives (AMC130x ΔΣ + C2000 sinc3)
← All reference designs · Vendor page: TI TIDA-00171
| Hardware | unknown |
|---|---|
| Status | active |
| Application | motor-drive, ups, solar |
| Key devices | AMC1304M05, AMC1304M25, AMC1305, TMS320F28377D, SN6501, INA826 |
| Isolation | class: reinforced; tech: capacitive |
| Deliverables | schematic, bom, layout, firmware, gui, test-report |
| Quantity | current, voltage |
| Method | shunt-ds-modulator |
| Range | -250–250 V |
| Accuracy | gain_error_pct: 2; calibrated_error_pct: 0.2 |
| Output | ds-bitstream |
| Response time (µs) | 4 (vendor-claimed) |
| Last verified | 2026-10-21 |
Notes
Why it is interesting: the complete isolated ΔΣ chain, from shunt through modulator to the MCU’s built-in sinc filters, with a GUI for sweeping modulator clock and sinc-filter parameters. That makes it a good bench for the OSR-vs-latency trade-off (sinc³ settling ≈ 3·OSR/f_mod: 4.8 µs at OSR 32, 20 MHz). The stated < 4 µs fault response uses a short, low-OSR comparator filter path in parallel with the main filter.
Accuracy: < 2 % uncalibrated, ±0.2 % calibrated (vendor-claimed). The current range depends on the shunt you fit; only the modulator input range is recorded.
Tags: sinc3-in-mcu · 3-phase-currents-and-voltages · iec-61800-emc-tested · fast-ocp-path