What this PSoC 4 brings to a BOM line
The Infineon CY8C4125LQI-S423 is a 32-bit ARM Cortex-M0+ MCU from the PSoC 4 family, clocked at 24 MHz with 32 KB of Flash and 4K x 8 of SRAM. Its standout feature is the integrated CapSense block — Infineon's capacitive touch-sensing engine — alongside a 16-channel 10-bit slope ADC, a 16-channel 12-bit SAR ADC, and two IDAC outputs.
CapSense and analog — the single-chip touch interface
The CapSense peripheral is Infineon's own capacitive touch-sensing IP, designed for moisture-tolerant button, slider, and proximity sensing. The dual ADC architecture — a 10-bit slope ADC for low-power scanning and a 12-bit SAR ADC for higher-resolution measurements — lets the designer trade off speed versus precision without adding an external converter.
Temperature grade and deployment environment
Rated for -40°C to 85°C (TA), this part covers industrial enclosures, outdoor telecom cabinets, and commercial appliances. It is not AEC-Q100 qualified, so it is not specified for under-hood automotive or engine-bay environments. For a quality-doc-control engineer verifying a replacement part for a production line, the temperature grade matches the original spec — no derating needed for a panel that lives in a conditioned factory space.
Lifecycle and sourcing reality
The CY8C4125LQI-S423 carries an Active lifecycle status from Infineon. That means no last-time-buy risk and continued manufacturing support for new designs.