PSoC1 CY8C21xxx — 8-bit MCU with configurable analog
The CY8C21334-24PVXIT: It carries 8 KB of on-chip Flash program memory and 512 bytes of SRAM — enough for a sensor-interface or control-loop application that does not need large data buffers. The 28-channel 8-bit ADC is the headline analog resource: it samples up to 28 single-ended inputs at 8-bit resolution, suitable for threshold detection, level monitoring, or low-resolution sensor readout without an external converter. The serial interface set — I²C, SPI, and UART/USART — covers the common bus protocols for connecting to sensors, displays, or a host controller.
Supply, temperature, and package — single-rail industrial MCU
The 16 general-purpose I/O share the package with the serial interface pins and the analog input channels — the pin allocation is fixed, so the board layout should reserve the ADC inputs for the sensor front-end and the serial pins for the bus interface.
On-chip peripherals — POR, PWM, WDT, internal oscillator
The POR (Power-On Reset) eliminates the external reset supervisor IC; the PWM output drives a buzzer, LED, or small motor without a dedicated timer peripheral; the WDT (Watchdog Timer) resets the MCU if the firmware hangs. The internal oscillator runs the core at 24 MHz without an external crystal — the accuracy is adequate for UART baud-rate generation at this speed.