Small-footprint 8-bit MCU for tight BOMs and simple control loops
The Microchip PIC12F629-I/SN is an 8-bit PIC microcontroller in a compact 8-SOIC package, built around the PIC core with 1.75 KB of Flash program memory, 64 bytes of RAM, and 128 bytes of EEPROM.
20 MHz internal oscillator — no external crystal needed
If your timing budget is tighter than ±1%, you may still want an external resonator, but for general-purpose control the internal RC is adequate.
64 bytes RAM and 128 bytes EEPROM — plan your data layout
With only 64 bytes of RAM, every variable counts. The 128 bytes of EEPROM are separate from program Flash and can be byte-written in-circuit, which is handy for storing calibration constants, serial numbers, or configuration settings that survive power cycles. The EEPROM endurance is typically 100k write/erase cycles — enough for field-updatable parameters but not for high-frequency data logging.
Industrial temperature grade and wide supply voltage
At 5 V the I/O pins swing rail-to-rail, simplifying interface to 5 V logic peripherals.