8051 core at 50 MHz — what it means for the loop
The CY8C3446AXI-099T is an 8-bit 8051 MCU clocked at 50 MHz, part of the PSOC® 3 CY8C34xx family from Infineon (formerly Cypress). It carries 64 KB of Flash program memory, 8K x 8 of RAM, and 2K x 8 of EEPROM — enough code and data space for a medium-complexity control loop with field-upgradeable firmware. The 8051 core at this speed handles real-time tasks like sensor polling, PID updates, and communication stack processing without a dedicated co-processor.
CapSense and mixed-signal peripherals
On-chip peripherals include CapSense (capacitive touch sensing), DMA, LCD drive, POR, PWM, and WDT. The data converter block provides a 16-channel 12-bit ADC and a 2-channel 8-bit DAC — this is a genuine mixed-signal controller, not just a digital MCU with an afterthought ADC. For a touch-interface panel or an analog sensor front-end, you can route signals directly into the ADC without an external converter.
Supply range and temperature grade
Supply voltage spans 1.71 V to 5.5 V. Operating temperature range is -40°C to 85°C.
Lifecycle and sourcing
The CY8C3446AXI-099T carries an Active product status and is ROHS3 compliant. No end-of-life notice or last-time-buy window is in effect. For dual-sourcing or supply resilience, the PSOC® 3 family shares the same 8051 core and peripheral set across density options, but no pin-compatible second-source alternate is listed in the official cross-reference.