48 MHz Cortex-M0 with 128 KB Flash — the control-loop workhorse
The CY8C4247AZI-M475: It carries the full PSoC 4 analog complement: a 16-channel 12-bit SAR ADC and four 8-bit DACs, plus the CapSense and SmartSense peripheral blocks for capacitive touch sensing without external tuning.
Supply rail and power management
Runs from a 1.71 V supply, which lets it pair directly with a single-cell Li-ion battery without a level shifter on the core supply. The on-chip brown-out.
Peripheral set for touch and mixed-signal
The CapSense block with SmartSense auto-tuning is the headline differentiator here: it handles capacitive touch buttons, sliders, and proximity sensing without per-board calibration, which cuts firmware tuning time and simplifies BOM consolidation across product variants. The 16-channel 12-bit SAR ADC samples at rates suitable for current-sense or temperature feedback loops, and the four 8-bit DACs can drive analog outputs or reference voltages for external comparators.